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MDS 9790 Series

GE MDS 4790 Series, MDS 4790A, MDS 9790 Series, MDS 4790S, MDS 9790A Installation & Operation Manual

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Installation & Operation Guide
MDS 05-3438A01, Rev. F
SEPTEMBER 2008
400 MHz/900 MHz
Multiple Address System
Master Station Radio
MDS 4790/9790 Series
(including MDS 4790A/C/E/S, MDS 9790A)
http://www.RSPSupply.com/p-8457-MDS-UP-9790X.aspx
QUICK START GUIDE
1. Install and connect the antenna system to the radio (page 9).
• Use an appropriate antenna aimed at the associated station.
• Use low-loss feedline suited for 400/900 MHz. Kee p the feedline as short as possible.
2. Connect the backup battery (page 15).
3. Connect the host computer to the DATA connector on the rear panel (page 23).
4. Verify proper input voltage level and connect power to the radio. Set the power switch(es) to ON.
5. Configure the data interface baud rate (page 42).
6. Observe front panel indicators for proper operation.
Invisible place holder
ACTIVE (green)—This transceiver board (A or B) is the selected unit. STBY (yellow)—This transceiver board (A or B) is the standby unit (redun d ant ver s ion on ly) . ALARM (red)—General fault not covered by the other alarm categories (RX ALR, TX ALR, I/O ALR). RX ALR (red)—Difficulty receiving. May be due to an antenna problem, receiver fault, or other
condition causing a low received signal level.
TX ALR (red)—Fault with the transmit circuitry. I/O ALR (red)—The data rate or format of data at the data interface conne ctor is incomp atible with the
radio settings.
A
B
ACTIVE STBY ALARM RX ALR TX ALR I/O ALR
ACTIVE STBY ALARM RX ALR TX ALR I/O ALR
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide i
TABLE OF CONTENTS
1.0 INTRODUCTION.....................................................................................1
2.0 PRODUCT DESCRIPTION.....................................................................1
2.1 Network-Wide Diagnostics ...............................................................2
2.2 Redundant versus Non-redundant Operation ..................................2
2.3 Applications ......................................................................................3
Basic MAS Master Station Operation................................................3
Repeater and Polling Remote Operation..........................................3
Simplex and Switched Carrier Operation..........................................4
2.4 Features ...........................................................................................4
2.5 Accessories ......................................................................................5
2.6 Model Number Codes ......................................................................6
3.0 INSTALLATION PLANNING....................................................................6
3.1 General Requirements .....................................................................6
Site Selection.................................................................................. ..7
A Word About Interference ................................................ ... .... ... ... ..8
3.2 Antenna and Feedline Selection ....... ... ... .... ... ... ... .... ... ... ... ... .... ... ... ..9
Antenna System................................................................................9
Feedline Selection ............................................................................9
4.0 INSTALLATION PROCEDURES...........................................................10
4.1 Unpacking and Inspection .... .......................................................... 11
4.2 Mounting the Radio ........................................................................11
Rack Mounting................................................................................12
Tabletop Mounting...........................................................................12
Remote Front Panel Mounting—Optional Configuration.................12
4.3 Primary Power ................................................................................13
AC-Powered Units .......................................... ... ... .... ... ... ................14
DC-Powered Units..........................................................................14
4.4 Backup Battery ...............................................................................15
Location of Battery Backup Switch ....................................... .... ......15
Low-Voltage Disconnect Feature....................................................16
Battery Reset Switch (SW1/LVD PCB)........... ... ... ..........................16
4.5 Antenna Installation ........................................................................17
Feedline Installation........................................................................17
4.6 Interface Wiring Connections .........................................................18
TX, Antenna, and RX Coaxial Connectors (Type-N).......................18
Ground Connection.........................................................................21
Diagnostics Connector—J1 ............................... ... .... ... ...................21
4-Wire Audio Connector—J2..........................................................22
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ii MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Data Interface Connector—J3 ........................................................23
Orderwire Connector—J9...............................................................24
Alarm Contacts—J10......................... ... ... .... ... ... ... .... ... ... ... ... .......... 24
4.7 Post Installation Checks .................................................................26
5.0 START-UP AND OPERATION..............................................................26
5.1 Initial Startup ..................................................................................26
Normal Indications..........................................................................26
Maximizing RSSI............................. ... ... ... .... ... ... ... .... ... ... ... .............26
Coordinating Activities by Orderwire...............................................27
5.2 Front Panel Indicators ....................................................................27
LED Indicators ...... ... ... ................................................................. ...28
Front Panel Display.........................................................................29
6.0 DIAGNOSTICS AND CONTROL ..........................................................30
6.1 PC Connection ...............................................................................30
6.2 PC Command Summaries .............................................................32
Commands and Command Parameters .........................................33
6.3 Detailed Command Descriptions ....................................................37
ALARM............................................................................................37
AMASK [0000 0000–FFFF FFFF]...................................................40
ASENSE [HI/LO].............................................................................41
BATT(ery) [ON/OFF].......................................................................41
BAUD [xxxxx abc]...........................................................................42
BUFF [ON/OFF]................. .............................................................42
CKEY [ON/OFF]..............................................................................43
CTS [0-255]........................... ... .... ... ... ... ..........................................43
DATAKEY [ON/OFF].......................................................................44
DATE [mmm dd yyyy] .....................................................................44
DKEY..............................................................................................45
DLINK [ON/OFF/xxxx].....................................................................45
DMGAP [xx]....................................................................................45
DTYPE [NODE/ROOT/GATE/PEER]..............................................46
EMP [ON/OFF]...................... ... .... ... ... ... ... .... ... ................................46
HREV..............................................................................................46
INIT.................................................................................................46
KEY.................................................................................................47
LOG [CLR]......................................................................................48
MADDR [NONE, 1–255] .................................................................48
MODEL...........................................................................................48
MODEM [NONE/4800/9600/19200/DEFAULT]...............................48
NMASK [0000 0000–FFFF FFFF]...................................................49
OPT.................................................................................................50
OWM [xxxxx]...................................................................................50
OWN [xxxxx]......................... ... .... ... ... ... ..........................................50
PTT [0-255].....................................................................................50
PWR [20–37]...................................................................................51
RADIO [AUTO/A/B].........................................................................51
REPEATER [ON/OFF]....................................................................51
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide iii
RSSI, RSSI!................................. ... ... .............................................52
RTU [ON/OFF/0-80]........................................................................52
RX [xxx]...........................................................................................52
RXLEVEL [–20 to +3]......................................................................53
RXMUTE [ON/OFF/Time in msec]..................................................53
RXPAD [ON/OFF]...........................................................................53
RXTOT [NONE, 1-1440] .................................................................53
SCD [0-255]....................................................................................54
SER.................................................................................................54
SHOW [DC/PWR/CURRENT/RADIO] ............................................54
SNR, SNR!...................................................... ... ... .... ... ...................55
SREV..............................................................................................55
STANDBY [ON/OFF].......................................................................56
STAT...............................................................................................56
TEMP..............................................................................................57
TIME [hh:mm:ss].......................................................... ... ... ... .......... 57
TOT [ON/OFF, 1-255] ........ ... ... .... ... ... ... ... .......................................58
TX [xxxx].................................. .... ... ... .............................................58
TXGAIN [ON/OFF]............. ... ... .......................................................59
TXLEVEL [–20 to +3, AUTO]..........................................................59
UNIT [10000–65000].......................................................................59
6.4 Configuration and Programming using the Front Panel .................60
Programming and Control Buttons..................................................62
Navigating Through the Front Panel Screens.................................62
Switching the Front Panel Display to Configuration Mode..............63
Use of Control Buttons in Configuration Mode................................63
Changing radio functions...................................... .... ... ... ... ... .... ... ...64
6.5 Screen Descriptions .......................................................................64
Group 1—Startup Screen and Menu Directory (page 69)...............64
Group 2—Configuration Screens (Page 69)... ... ... .... ... ... ...... .... ... ...64
Group 3—Diagnostic Screens (Page 78) . .... ... ... ... .... ......................65
Group 4—Event Log (Page 80) ......................................................65
7.0 LOCAL & NETWORK-WIDE PROBLEM SOLVING..............................79
7.1 Local Problem-Solving ................................................................... 80
Front Panel LEDs............................................................................80
Chassis-Mounted LEDs..................................................................81
Problem Solving Using a Connected PC........................................82
Problem Solving Using the Front Panel Display ....................... ... ...82
System Bench Testing Set-up...... ... ... ... ... .... ... ... .............................83
7.2 Performing Network-Wide Radio Diagnostics ................................84
8.0 REPLACING ASSEMBLIES..................................................................86
8.1 Transceiver Board and Power Supply Assemblies ........................86
8.2 Installation & Removal of Backup Battery
(P/N 28-1575Axx) ................................ ... ... ... ..........................................87
8.3 Front Panel .....................................................................................88
8.4 Operating Frequency Change Considerations ............................ ... 89
MDS 4790—400 MHz Notch-Type Duplexers................................90
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iv MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
MDS 9790—Bandpass-Type Duplexers............... .... ... ... ... ... .... ... ...90
MDS 4790/9790 Simplex Radios—With Antenna Switch Modules.91
MDS 4790/970—Front End Helical Coil Alignment.........................91
8.5 Testing and Removing an Internal Duplexer ..................................91
Testing.............................................................................................91
Removing the Internal Duplexer .....................................................92
8.6 Testing and Removing the Antenna Switch Module .... ... ... ... ..........93
Testing.............................................................................................93
Removing the Antenna Switch........................................................94
8.7 Cooling Fan Maintenance .............................................................95
9.0 RADIO SOFTWARE UPGRADES ........................................................95
9.1 Obtaining New Code ......................................................................95
9.2 Preparing for Download .................................................................96
9.3 Downloading New Code—Procedure ............................................96
10.0 TECHNICAL REFERENCE.................................................................97
10.1 Technical Specifications ...............................................................97
10.2 RF Propagation Planning .............................................................99
Fresnel Zone Clearance ...............................................................100
Earth Curvature............................ ... ... ... ... .... ... ... ...........................101
Fade Margins................................................................................101
Calculating Path Loss.............................. .... ... ... ... .... ... ... ... ... .... ....102
10.3 Formulas for System Planning .................. ................................. 102
Free Space Path Loss...................................................................102
Fresnel Zone Boundary ................................................................102
Theoretical Signal Strength............................. ... ... ........................102
Probability of System Fading........................................................103
10.4 dBm-Volts-Watts Conversion Chart ............................................104
Copyright Notice
This Installation and Operation Guide and all software described herein are protected by copyright: 2008 GE MDS. All rights reserved.
GE MDS reserves its right to correct any errors and omissions in this publication.
Operational Safety Notices
The radio equipment described in this guide uses radio frequency trans­mitters. Although the power level is low, the concentrated energy from a directional antenna may pose a health hazard. Do not allow people to come in close proximity to the front of the antenna when the transmitter is operating.
This manual is intended to guide a professional installer to install, operate, and perform basic system maintenance on the described radio.
RF Exposure
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide v
ISO 9001 Registration
GE MDS adheres to this internationally-accepted quality system stan­dard.
Quality Policy Statement
We, the employees of GE MDS, are committed to achieving total cus­tomer satisfaction in everything we do.
Total Customer Satisfaction in:
• Conception, design, manufacture, and marketing of our products.
• Services and support we provide to our internal and external customers.
Total Customer Satisfaction Achieved Through:
• Processes that are well documented and minimize variations.
• Partnering with suppliers who are committed to providing quality and service.
• Measuring our performance against customer expectations and industry leaders.
• Commitment to continuous improvement and employee involvement.
Revision Notice
While every reasonable effort has been made to ensure the accuracy of this manual, product improvements may result in minor differences between the manual and the product shipped to you. If you have addi­tional questions or need an exact specification for a product, please con­tact our Customer Service Team using the information at the back of this guide. In addition, manual updates can often be found on our Web site at
www.GEmds.com.
Warning—400 MHz Distress Beacons
In the U.S.A., the 406 to 406.1 MHz band is reserved for use by distress beacons. Since the MDS 4790 Series radio can transmit in this band, take precautions to prevent the radio from transmitting between 406 and
406.1 MHz.
ESD Notice
To prevent malfunction or damage to this radio, which may be caused by Electrostatic Discharge (ESD), the radio should be properly grounded by connection to the ground stud on the rear panel. In addition, the installer or operator should follow proper ESD precautions, such as touching a grounded bare metal object to dissipate body charge, prior to connecting and disconnecting cables on the front or rear panels.
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vi MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Environmental Information
The equipment that you purchased has required the extraction and use of natural resources for its production. Improper disposal may contami­nate the environment and present a health risk due to hazardous sub­stances contained within. To avoid dissemination of these substances into our environment, and to diminish the demand on natural resources, we encourage you to use the appropriate recycling systems for disposal. These systems will reuse or recycle most of the materials found in this equipment in a sound way. Please contact GE MDS or your supplier for more information on the proper disposal of this equipment.
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 1
1.0 INTRODUCTION
This guide presents installation and operating instructions for the MDS 4790 and MDS 9790 Series Master Station Radio. It begins with an overall description of radio features and is followed by the steps required to install the unit and place it into normal operation.
Additionally, the guide contains troubleshooting tips for resolving system difficulties that you might encounter. After you install the radio, keep this guide near the radio for future reference.
2.0 PRODUCT DESCRIPTION
The master station radio (Figure 1) is a full-duplex data telemetry radio suitable for use in Multiple Address System (MAS) and Supervisory Control and Data Acquisition (SCADA) applications. The radio uses microprocessor control and Digital Signal Processing (DSP) technology to provide highly reliable communications even under adverse condi­tions.
The MDS 4790 is intended to be used in systems with compatible MDS 4710 Series remote radios; it operates in the 400 MHz frequency band (380 to 512 MHz for A and C models; 400 to 480 MHz for E models). The MDS 4790S uses an over-the-air data rate of 9600 bps.
The MDS 9790 is used with compatible MDS 9710 Series remote radios, and it operates between 800 and 960 MHz. Radios are available in either a redundant configuration or a non-redundant configuration. Refer to Section 2.2, Redundant versus Non-redundant Operation,
beginning on Page 2 for more information.
Invisible place holder
Figure 1. MDS 4790/9790 Series Master Station
ENTER
ESCAPE
ACTIVE
ACTIVE
STBY
ALARM
RX ALR
TX ALR
STBY
ALARM
RX ALR
TX ALR
LINE
LINE
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2 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
All assemblies, including the duplexer and power supply, are contained in the radio’s compact (2RU high) enclosure. The radio’s compact size allows it to fit into most existing systems, in either tabletop or rack mounted configurations. Connectors are provided on the rear panel for easy connection of power, antenna, data, alarm, and diagnostic func­tions.
2.1 Network-Wide Diagnostics
Newer GE MDS remote and master station radios, including the MDS 4790/9790 Series, offer network-wide diagnostics capability. Net­work-wide diagnostics communications is a modern, packetized mode that has several advantages over DTMF diagnostics communications (used by older GE MDS radios):
• You can gather diagnostic data over a large radio network with­out disrupting the system communications flow.
• When required, you can increase diagnostics communications speed by actively collecting diagnostic data.
• You can access diagnostic data for each radio in the network from any radio diagnostics port in the network.
• You can broadcast certain messages to all radios in the system simultaneously.
You can use the MDS 4790/9790 Series Master Station to poll remote radios in its radio system for diagnostic data. For more information on the implementation of network-wide diagnostics, refer to the GE MDS Network-wide Diagnostics Handbook (P/N 05-3467A01).
2.2 Redundant versus Non-redundant Operation
A redundant configuration means that the master station has two com­plete transceiver boards and power supplies installed in the enclosure. In the event of a failure in the primary equipment, the controlling logic switches to the stand-by unit. The stand-by transceiver board is con­stantly operating and its operational readiness is monitored. However, the power amplifier in the stand-by board is not operating when it is in stand-by mode.
In a non-redundant configuration, there is only one transceiver board installed in the “A” slot of the enclosure, and back-up transceiver board operation is not possible.
Transceiver boards may be moved from one master station to another, or an additional transceiver board may be added to a non-redundant master station. You do not need to specify redundant or non-redundant operation, or select the active transceiver board. Installing or replacing
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 3
a transceiver board causes the boards to communicate briefly with each other to establish which board will operate as the active board and which operates as the stand-by. For more information, refer to “Transceiver Board and Power Supply Assemblies” on Page 86.
2.3 Applications
The MDS 4790/9790 Series radios are designed for point-to-multipoint data transmission in oil and gas pipeline communications, transactional systems, and telecommunications systems. A MAS network provides communications between a central host computer and remote terminal units (RTUs) or other data collection devices. The operation of the radio system is transparent to the computer equipment.
Basic MAS Master Station Operation
Figure 2 shows a typical point-to-multipoint system using an
MDS 4790/9790 Series master station. This is a basic system consisting of a central master station and several associated remote units.
Figure 2. Typical MAS Network
Repeater and Polling Remote Operation
A MAS system using repeater and polling remote radios is shown in
Figure 3 on Page 4. Notice that the polling remote radio operates in
half-duplex mode and the repeater operates in full-duplex mode. Con­figuring the radio for repeater operation is as simple as typing REPEATER
ON
with a PC connected to the rear panel diagnostic port. Refer to
“DIAGNOSTICS AND CONTROL” on Page 30 for details.
–
I D IA G
13 . 8 VDC
P W
R
+
–
HOST SYSTEM
REMOTE RADIO
SWC OFF
RTU
RTU
RTU
RTU
–
I DI A G
1
3.8 V
D C
PW R
+
–
–
I DI AG
13.8 V
DC
P WR
+
–
–
ID I AG
1 3 .8 VDC
P W
R
+
–
–
I D IAG
13.8 V D C
PW
R
+
–
RTU
MDS MASTER
STA TION
CONTINUOUSLY
KEYED
REMOTE RADIO
SWC OFF
REMOTE RADIO
SWC OFF
REMOTE RADIO
SWC OFF
REMOTE RADIO
SWC OFF
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4 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Figure 3. Typical Repeater and Polling-Remote Network
Simplex and Switched Carrier Operation
System-wide simplex operation is achieved by switching the master sta­tion carrier on to transmit, then off to receive. The same frequency is used for both transmit and receive.
Switched carrier, half-duplex mode works in the same way, except dif- ferent frequencies are used for transmit and receive.
2.4 Features
Reliability is a hallmark of the MDS 4790/9790 design. The radio employs a one-piece transceiver board which minimizes RF losses and eliminates the need for inter-board cabling. This also allows easy plug-in replacement if servicing is necessary.
In addition, the optional redundant version of the radio includes redun­dant transceiver boards and power supply modules that automatically activate if a failure in either of the transceiver boards or power supplies occurs. This ensures continued operation in the event of most trans­ceiver board failures.
The following list highlights many of the radio’s key features. For a full listing of specifications, refer to Section 10.1, Technical Specifications,
beginning on Page 97.
–
I DIAG
13. 8 VD
C
PWR
+
–
HOST SYSTEM
REMOTE RADIO
RTU
RTU
RTU
RTU
–
IDIAG
13 .8 VDC
PWR
+
–
–
IDI A G
1 3 . 8 V
D C
P W
R
+
–
–
I DIAG
13.8 V D C
P WR
+ –
–
I D IA G
13. 8 VD
C
PWR
+
–
RTU
CONTINUOUSLY
KEYED
REMOTE RADIO
REMOTE RADIO
REMOTE RADIO
REMOTE RADIO
POLLING REMOTE
REPEATER
HALF-DUPLEX
SWITCHED CARRIER
TX HIGH RX LOW
TX LOW RX HIGH
TX LOW RX HIGH
TX LOW RX HIG
H
TX LOW RX HIGH
TX LOW RX HIGH
TX LOW RX HIGH
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 5
• Primary power options for: 15, 24, 48, or 125 volt DC and 115/230 volts AC sources.
• Configuration, control, and diagnostics from the front panel dis­play or a connected PC.
• Remote diagnostics using a connected PC and radio software.
• Time stamping of alarms and major events.
• Flexible mounting (rack or tabletop); front panel can be (option­ally) mounted separately from the radio chassis.
2.5 Accessories
You can use the radio with one or more of the accessories listed in
Table 1. Contact the factory for ordering information.
Table 1. Radio Accessories
Option Description Part No.
Diagnostics and Control Software
PC-based software for control, diagnostics, and software upgrades of the radio.
03-3533A01
Diagnostic and Control Interface Cable
Allows connection of a PC to the radio for control and diagnostics (DB-9 to DB-9).
03-2198A17
Front Panel Rack Mounting Kit
Allows rear-rack mounting of the detachable front panel. Used in installations where all controls and indicators must be accessible from the rear of the radio.
03-3228A01
Orderwire Handset Allows orderwire communications with other
stations in the network.
12-1307A01
Cavity Filter Kit (For MDS 9790x)
Removes or attenuates interfering 900 MHz signals from the receiver input. Might be necessary in areas with high powered stations nearby, such as paging transmitters. Available for use with an internal or external duplexer.
03-3621Axx
RF Combiner Panel, 9/24 MHz splits
(MDS 9790x only)
Combines the outputs from two master stations into one antenna. Designed for installations where one master uses a 9 MHz split and the other uses a 24 MHz split.
03-3665Axx
VOX Board Voice-activated transmit board that keys the
transmitter when an audio signal is present on the radio’s audio input pin.
03-1098A02
Lightning Protectors
Polyphaser Surge Protector, IS-50NX-C2, DC blocked, 125 MHz to 1000 MHz, N female connectors, surface (flange) mount
Polyphaser Surge Protector, IS-B50LN-C2, DC blocked, 125 MHz to 1000 MHz, N female connectors, bulkhead mount
97-1680A01
97-1680A05
Redundant Radio Upgrade Kit
Adds an additional transceiver board and power supply to a single-radio chas sis. Operating frequency must be specified when ordering.
Consult Factory
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6 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
2.6 Model Number Codes
The radio model number is printed on the serial number label, which is affixed to the radio chassis. The alpha-numeric string describes the unit’s hardware and software configuration as it was shipped from the factory. This model number is an important reference when speaking with, or writing to, the factory for assistance.
3.0 INSTALLATION PLANNING
The installation of the radio is not difficult, but it does require some planning to ensure reliability and efficiency. This section provides tips for selecting an appropriate site, choosing antennas and feedlines, and minimizing the chance of interference. Review this material before beginning equipment installation.
3.1 General Requirements
There are three main requirements for installing the radio—adequate and stable primary power, a good antenna system, and the correct inter­face between the radio and the data device. Figure 4 shows a typical sta­tion arrangement.
Invisible place holder
Figure 4. Typical Station Arrangement
TO INPUT
POWER SOURCE
LOW LOSS
COAXIAL CABLE
OMNIDIRECTIONAL
ANTENNA
HOST COMPUTER
DIAGNOSTICS
COMPUTER
ENTER
ESCAPE
ACTIVE
ACTIVE
STBY
ALARM
RX ALR
TX ALR
STBY
ALARM
RX ALR
TX ALR
LINE
LINE
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 7
Site Selection
For a successful installation, carefully select the site for the master sta­tion and the remote radios. Suitable sites offer:
• An antenna location that provides an unobstructed path to all the remote radios in the system
• A source of adequate and stable primary power
• Suitable entrances for antenna, interface, or other required cabling.
You can quickly determine these requirements in most cases. A possible exception is the first item—verifying that an unobstructed transmission path exists. UHF radio signals travel primarily by line-of-sight, and obstructions between the sending and receiving stations affect system performance.
If you are not familiar with the effects of terrain and other obstructions on radio transmission, the following discussion provides helpful back­ground.
Terrain and Signal Strength
A line-of-sight path between stations is highly desirable and provides the most reliable communications link in all cases. You can often achieve a line-of-sight path by mounting each station antenna on a tower or other elevated structure that raises it high enough to clear surrounding terrain and other obstructions.
The requirement for a clear transmission path depends on the distance covered by the system. If the system covers only a limited distance, say
3.1 miles (5 km), then some obstructions in the transmission path might be acceptable. For longer range systems, any obstruction might compro­mise the performance of the system, or block transmission entirely.
The signal strength at the receiver must exceed the sensitivity limit by an amount known as the fade margin to provide reliable operation under various conditions.
Section 10.2, RF Pr opagation Planning, beginning on Page 99 includes
a detailed discussion of path planning. Review this section before begin­ning an installation. Computer software is also available for this purpose that greatly simplifies the steps involved in planning a path.
On-the-Air Test
If you’ve analyzed the proposed transmission path and feel that it is acceptable, conduct an on-the-air test of the equipment and path. This not only verifies the path study results, but allows you to see firsthand the factors involved at each installation site.
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8 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
The test can be performed by installing a radio at each end of the pro­posed link and checking the RSSI value reported at the radio’s front panel display (refer to “Front Panel Indicators” on Page 27). If you do not obtain adequate signal strength, it might be necessary to mount the station antennas higher, use higher gain antennas, or select a different site for one or both stations.
To prepare the equipment for an on-the-air test, follow the general installation and operation procedures given in this guide and become familiar with the operating instructions provided in Section 5.0,
START-UP AND OPERATION, beginning on Page 26.
A Word About Interference
Interference is possible in any radio system. However, since the MDS 4790/9790 Series is designed for use in a licensed system, inter­ference is less likely because geographic location and existing operating frequencies are taken into account when allocating frequencies.
The risk of interference can be further reduced through prudent system design and configuration. Allow adequate separation between frequen­cies and radio systems.
Keep the following points in mind when setting up your radio system:
1. Systems installed in lightly populated areas are least likely to encounter interference; those in urban and suburban environments are more likely to be affected by other devices operating on nearby frequencies.
2. Directional antennas should be used at the remote end of the link. They confine the transmission and reception pattern to a narrow beam, which minimizes interference to and from stations located outside the pattern.
3. If interference is suspected from another system, it might be helpful to use antenna polarization that is opposite to the interfering sys­tem’s antennas. An additional 20 dB (or more) of attenuation to interference can be achieved by using opposite antenna polarization.
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 9
3.2 Antenna and Feedline Selection
Antenna System
The antenna system is perhaps the most crucial part of the system design. An antenna system that uses poor quality feedline, or is improp­erly aligned with the companion site, will result in poor performance or no communication at all.
Generally speaking, an omni-directional antenna (Figure 5) is used at the master station site. This type of antenna provides equal coverage to all of the remote sites. At remote stations, directional antennas such as Yagis, are typically used.
Figure 5. Typical Omnidirectional Antenna for Master Station
(Shown mounted to mast)
Feedline Selection
For maximum performance, use a good-quality feedline to connect the radio to the antenna. For short-range transmission, or where short lengths of cable are used (up to 8 meters [26 feet]), an inexpensive coax cable such as Type RG-213 might be acceptable.
For example, 100 feet (30 meters) of RG-58A/U cable (commonly used for frequencies below 100 MHz) has an insertion loss of 5 dB at 450 MHz. A 5 watt transmitter operating into such a feedline would pro­duce only 1.6 watts at the antenna; a similar loss in receiver sensitivity would result, and no amount of receiver gain can recover the signal lost in the feedline.
Conversely, 100 feet (30 meter) of 1-5/8 inch cable has a loss of 0.52 dB at the same frequency, but its cost is considerably higher than RG-58A/U.
For systems covering short distances, feedline loss is relatively unim­portant, and 6 dB or more of loss might be acceptable. For systems designed for maximum range, however, each dB of loss directly affects signal-to-noise ratio at the receiver. It is good practice to keep feedline
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10 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
losses as low as possible and certainly under 3 dB. Remember that for each 3 dB of feedline loss, half the transmitter power is lost, and twice the receive signal power is needed to produce the same signal-to-noise ratio.
The RG-8A/U cable is a widely available and inexpensive feedline that is suitable for systems with short ranges or those with short feedlines. For longer feedlines and lower losses, Andrew HELIAX™ semi-rigid coaxial cable or similar products are a good choice. Table 2 shows the length of various types of cable and the resulting degradation in signal strength.
Mount the antenna and feedline securely to the supporting structure to avoid damage from wind and ice loading. Follow the instructions pro­vided by the antenna and feedline manufacturers to ensure a safe and reliable installation.
4.0 INSTALLATION PROCEDURES
This section presents the steps necessary for installing the radio and con­necting it to associated equipment. After completing these steps, the radio is ready for in-service operation.
Table 2. Feedline Loss Chart (450 MHz)
Cable Type
3.05 Meters (10 Feet)
15.24 Meters (50 Feet)
30.48 Meters (100 Feet)
152.4 Meters (500 Feet)
RG-8A/U 0.51 dB 2.53 dB 5.07 dB 25.35 dB 1/2 in. HELIAX 0.15 dB 0.76 dB 1.51 dB 7.55 dB 7/8 in. HELIAX 0.08 dB 0.42 dB 0.83 dB 4.15 dB 1-1/4 in. HELIAX 0.06 dB 0.31 dB 0.62 dB 3.10 dB 1-5/8 in. HELIAX 0.05 dB 0.26 dB 0.52 dB 2.60 dB
Table 3. Feedline Loss Chart (960 MHz)
Cable Type
3.05 Meters (10 Feet)
15.24 Meters (50 Feet)
30.48 Meters (100 Feet)
152.4 Meters (500 Feet)
RG-8A/U 0.85 dB 4.27 dB 8.54 dB 42.70 dB 1/2 in. HELIAX 0.23 dB 1.15 dB 2.29 dB 11.45 dB 7/8 in. HELIAX 0.13 dB 0.64 dB 1.28 dB 6.40 dB 1-1/4 in. HELIAX 0.10 dB 0.48 dB 0.95 dB 4.75 dB 1-5/8 in. HELIAX 0.08 dB 0.40 dB 0.80 dB 4.00 dB
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 11
4.1 Unpacking and Inspection
Figure 6 shows a typical radio shipment. Check the contents against the
packing list secured to the outside of the shipping box. Accessories and spare parts kits, if any, are wrapped separately. Inspect all items for signs of damage. Save all packing materials in case you need to ship the radio in the future.
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Figure 6. Typical Shipment Contents
4.2 Mounting the Radio
Install the radio in a relatively clean, dust-free environment that allows easy access to the rear panel connectors as well as the front panel con­trols and indicators. Air must pass freely over the heatsink on the rear panel.
Figure 7 on Page 12 shows the mounting dimensions of the radio. Most
commonly, the radio is installed in a 2U/3.5 inch (88.90 mm) rack-mount configuration, but you can also install it in a simple tabletop arrangement if desired.
PC DIAGNOSTICS & CONTROL CD-ROM (OPTIONAL)
RACK-MOUNT BRACKETS (2
)*
A B
ESCAPE
ENTER
INSTALLATION
& OPERATION GUIDE
ADHESIVE FEET (4)*
(For tabletop mounting)
POWER CORD (AC cord shown)
* These items may already be installe
d
on the radio chassis.
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12 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Rack Mounting
To rack-mount the radio, use the supplied mounting brackets (MDS P/N 82-3184A01) to secure the chassis to the rack cabinet. Attach the brackets at any of four points on the sides of the enclosure— front, back, middle facing front, and middle facing back (see Figure 7). This flexibility ensures compatibility with most rack mounting arrange­ments.
Tabletop Mounting
You can place the radio on any sturdy shelf or tabletop that will support its weight. Adhesive-backed rubber feet are provided with the radio for use in tabletop installations. Place the feet under the chassis near each corner to prevent scratching of the mounting surface.
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Figure 7. Mounting Dimensions
Remote Front Panel Mounting—Optional Configuration
If desired, you can detach the front panel from the radio and mount it separately from the radio chassis. This optional kit, MDS P/N 03-3228A01, is intended for rack-mount installations where all connec­tions and control must be performed from the rear of the radio. The Aux­iliary Mounting Plate (P/N 82-3189A01) is included in the kit.
To remove the front panel from the radio and re-mount it to the Auxil­iary Mounting Plate, follow these steps:
1. Detach the front panel from the radio by grasping it firmly along its bottom edge and pulling away from the radio chassis (Figure 8 on
Page 13).
2. Release the modular RJ-11 connector and cable from the back of the panel.
3
.5 inches
(
88.9 mm)
17.2 inches (437 mm)
14.29 inches (363 mm)
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 13
3. Plug the RJ-11 connector into an in-line splice con­nector (P/N 73-1155A09).
4. Plug one end of the RJ-11 to RJ-11 extension cable into the in-line splice connector and the other end into the front of the chassis at the square cut-out.
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Figure 8. Front Panel Removal
5. Snap the front panel onto the Auxiliary Mounting Plate in the same way it was attached to the main radio chassis.
6. Mount the Auxiliary Mounting Plate to the rack cabinet at any con­venient location within reach of the 7-foot cable (P/N 03-2198A04) supplied in the kit.
7. Attach the extension cable between the front panel modular connec­tor and the in-line splice connector on the radio chassis.
4.3 Primary Power
You can power the radio from a variety of standard AC and DC power sources ranging between 15 and 125 Vdc, or 115/230 Vac. The nominal input voltage is marked on the module at the rear of the radio or external power supply unit. See “Technical Specifications” on Page 97 for allow­able voltage ranges.
Before connecting a primary power source to the radio, verify that the source voltage matches the power supply’s operating range and type of service (AC or DC). Improper voltages (continuous or transient) might damage the equipment.
A
CAUTION
POSSIBLE
EQUIPMENT
DAMAGE
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14 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Redundant units have two identical internal or external power supplies depending on the option chosen when the order was placed. Non-redun­dant units have only one internal or external power supply. The 15 Vdc models have an interface panel and switch on the chassis, but no internal supply.
AC-Powered Units
AC-powered radios are designed to operate from 115 to 230 Vac (50-60 Hz). The supply automatically adjusts to match either standard voltage. However, the supply voltage must be between 90 and 132 Vac, or 180 to 264 Vac. Operation outside these two ranges might cause damage to the power supply. A North American-style AC power cord is supplied with these units. Figure 13 on Page 18 shows the AC power supply module’s receptacle and switch. Table 4 provides details for the AC power supply module’s replaceable fuse.
DC-Powered Units
Internal Units Figure 9 shows a rear view of in internal DC power supply. Connection
to the power supply is made with a three-conductor plug-in terminal strip (Phoenix connector P/N 73-1194A22). The radio operates in either a positive or negative-ground configuration. The center pin of the chassis connector is not connected within the radio.
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Figure 9. Rear View of Master Station, DC Power Input
External Units
External DC-power supplies are available as an option (Figure 10 on
Page 15). Two DC-to-DC power inverters are provided on an open rack
shelf. Each inverter is protected from dust and debris by a clear plastic cover.
Table 4. AC Power Supply Module Fuse
Part Description Part No.
Replaceable Fuse on AC Power Supply Module
Fuse, 5x20mm Glass 3.15A 250V 29-2130A06
Replaceable Fuse on Battery Control Assembly
Fuse, 3AG Fast .25x1.25 250V 1A 29-1064A06
ON/OFF SWITCH
DC POWER INPUT
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 15
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Figure 10. Typical Rack-Mounted External DC Power Supply
(with dual supplies)
4.4 Backup Battery
A single backup battery is normally installed in AC-powered master sta­tions. To prevent battery discharge during shipment, the radio’s internal Battery Backup switch is set to OFF at the factory. Set this switch to ON during installation to activate the radio’s battery-backup feature.
Location of Battery Backup Switch
The BATTERY BACKUP control switch is located behind the front panel to enable and disable the internal back-up battery. Access the switch by removing the front panel (see Figure 11 on Page 16).
To remove the front panel, grasp it firmly along its bottom edge and pull it away from the radio chassis (see Figure 8 on Page 13). Set the front panel aside, using care not to damage the interconnecting cable.
In most cases, the radio begins transmitting as soon as power is applied. Be sure that a proper load is attached to the radio’s RF output connector before applying battery or mains power.
If AC power is disconnected, or the rear panel AC power switches are set to OFF, the radio continues to operate on battery power until the battery discharges (approximately 1 hour). When shipping or storing the radio, always set the
BATTERY BACKUP switch to OFF to prevent discharge.
CAUTION
POSSIBLE
EQUIPMENT
DAMAGE
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16 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
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Figure 11. Battery Backup Switch Location
(Front Panel Removed)
Low-Voltage Disconnect Feature
The Low-Voltage Disconnect Assembly contains a low-voltage discon­nect circuit. This circuit prevents damage caused when the backup bat­tery drops below 10.65 volts, such as during an extended AC power outage.
When the back-up battery voltage drops to 10.65 Volts (± 0.2 V), the low-voltage disconnect circuit automatically disconnects the battery from the radio. This stops operation of the radio and protects the battery from potential damage. When AC power returns, the battery is automat- ically connected to the power supply for re-charging, and the radio resumes normal operation.
Battery Reset Switch (SW1/LVD PCB)
Normally, the operation of the Low-Voltage Disconnect Assembly is fully-automatic. The only exception is when replacing a discharged bat­tery with a charged battery when AC power is not present. In this case, it is necessary to press the
BATTERY RESET SWITCH SW1 on the
OFF ON
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 17
Low-Voltage Disconnect Assembly after installing the new battery (see Figure 12). Use a pen or other pointed object to press the switch. This enables the radio to operate until the new battery is dis­charged or the AC power is restored.
Figure 12. Location of Battery Reset Switch
NOTE: For replacement of a backup battery, refer to “Installation &
Removal of Backup Battery (P/N 28-1575Axx)” on Page 87.
4.5 Antenna Installation
Follow the antenna manufacturer’s instructions for proper installation of the antenna. Using the proper mounting hardware and bracket ensures a secure mounting arrangement with no pattern distortion or detuning of the antenna.
Regardless of the antenna brand, mount the antenna as far away as pos­sible from obstructions such as buildings, metal objects, and dense foliage. Choose a location that provides a clear path in the direction of the associated stations.
NOTE: Strong fields near the antenna can interfere with the operation
of low-level circuits and change the values of the received data. For this reason, mount the antenna at least 10 feet (3 meters) from the radio and other electronic equipment.
Feedline Installation
Use a low-loss feedline with the radio. See “Antenna and Feedline
Selection” on Page 9 for suggestions on choosing the correct feedline
for your installation. Whatever cable is used, keep it as short as possible to minimize signal losses.
Battery Reset Switch
(See Text)
Duplexer
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18 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
When installing the feedline, do not kink, twist, or stretch the cable. After installation, fasten the cable securely to the antenna tower or other supporting structure.
A Type-N connector is required to connect the feedline to the radio. Install the feedline connectors in accordance with the manufacturer’s instructions. Follow the manufacturer’s recommendations for weather­proofing connectors that will be installed outdoors.
If large-diameter, semi-rigid coaxial cable is used for the feedline, insert a short length of 1/4 inch Superflex
TM
Cable (MDS P/N 97-1677A28) or other low-loss flexible cable between the radio and the feedline. This flexible interface eliminates tight bends in the feedline and reduces stresses on the feedline and connectors. The flexible section also allows you to mount the radio slides, and to pull it out without stressing the transmission line.
4.6 Interface Wiring Connections
Make all connections to the master station at the rear panel (see
Figure 13). Refer to the following descriptions for specific information
on these connections.
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Figure 13. Master Station Rear Panel
TX, Antenna, and RX Coaxial Connectors (Type-N)
These are for connection to the station antenna, or external equipment such as a duplexer or cavity filter. The connectors present depend on whether the radio was shipped for operation with these external devices.
Application # 1— No External Devices
The most common arrangement of the master station is to connect directly to the antenna system. In such cases, only the
ANT connector is
present and the other coaxial connector holes are plugged. Figure 14 on
Page 19 shows a direct antenna connection.
OPTIONAL POWER SUPPLY
(Redundant Models)
ADDITIONAL HEATSINK
(Redundant Models)
HEATSINK
RADIO A
RADIO B
J10 ALARM
J2
4-WIRE AUDIO
J9
RJ-11
ORDERWIRE
J1
DIAGNOSTICS
(DB-9)
Power Supply
POWER ON/OFF
POWER
INPUT
TX*
J3
DATA
(DB-25)
RX*
ANT
Ground Lug (Hidden)
* Present when external duplexer or cavity filter is supplied. Otherwise, holes are plugged. See text.
Present when internal duplexer is supplied
.
Otherwise, hole is plugged. See text.
†
†
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 19
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Figure 14. Antenna Connection with Internal Duplexer
(Most common arrangement)
Application #2— External Duplexer
This arrangement is used in systems where the duplexer is mounted externally to the radio. The radio’s
TX and RX ports are the only connec-
tors present, and they connect to the duplexer as shown in Figure 15. Contact the factory for duplexer ordering information.
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Figure 15. Antenna Connection with External Duplexer
Application #3— External Cavity Filter
In some areas, interference from strong signals such as paging transmit­ters might require using a cavity filter. A cavity filter is an exter­nally-mounted device tuned to the frequency of an interfering signal. It removes or greatly attenuates the unwanted signal before it is detected by the master station receiver. Contact the factory for filter ordering information.
Because the cavity filter must be installed inline between the master sta­tion receiver and the station antenna, the cabling arrangement in
Figure 16 on Page 20 is required.
ANT
Master Station
RX
Master Station
TX
Ext. Duplexer
RX TX
ANT
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20 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
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Figure 16. Antenna Connection with External Cavity Filter
Application #4— External Duplexer and/or Cavity Filter on units shipped prior to June 1, 2000.
On units shipped prior to June 1, 2000, a maximum of two coaxial con­nectors are included on the rear panel. If only one connector is present, it connects directly to the antenna as shown in Figure 14 on Page 19.
If the radio is equipped for use with an external duplexer, a second con­nector is included (Figure 17). In this case, the right connector acts as the transmit output (to the duplexer), and the left connector acts as the receive input (from the duplexer).
Figure 18 on Page 21 shows the required cable connections between the
radio and an external duplexer (and cavity filter, if required).
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Figure 17. Coaxial Connectors for Older Radios
(For units intended to operate with an external duplexer)
RX
Master Station
TX
Cavity Filter
IN OUT
ANT
OPTIONAL POWER SUPPLY
(Redundant Models)
ADDITIONAL HEATSINK
(Redundant Models)
RADIO A
RADIO B
RX in (from Duplexer) TX out (to Duplexer)
This view applies only to units shipped prior to June 1, 2000
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 21
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Figure 18. RF Interconnections for Older Units
(For units intended to operate with
External Duplexer and/or Cavity Filter)
Ground Connection
A chassis grounding screw is located on the plate directly above the coaxial connectors. Use this screw to connect the chassis to an Earth (safety) ground, or other suitable grounding bus for the communications system. The ground lead should be kept as short as possible.
Connect all rack equipment and associated hardware grounds to the building’s ground system at the breaker panel for the primary power. The objective is to create a single-point ground system.
Do not overlook providing a good ground connection for the equipment attached to the DATA PORT to prevent damage.
Finally, use lightning protectors where the antenna transmission lines enter the building; bond them to the tower ground, if it is nearby.
Diagnostics Connector—J1
A DB-9 (9-pin) connector on the rear panel provides system diagnostics information. The
DIAGNOSTIC PORT is used to control and perform
diagnostics on the radio system from a connected computer. The com­munication speed between the computer and radio autobauds at 2400, 4800, 9600, 19200, or 38400 bps.
Figure 19 on Page 22 shows the EIA-574 (9-pin EIA-232) pin functions
of the
DIAGNOSTIC PORT as viewed from the radio’s rear panel. Con-
nection to J1 can be made with a DB-9 male connector, available from many electronics distributors.
RX
Master Station
TX
Cavity Filter
IN OUT
Ext. Duplexer
RX
TX
ANT
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22 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
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Figure 19. Diagnostics Port Connector, J1
4-Wire Audio Connector—J2
J2 is a plug-in terminal strip that provides connections for 4-wire audio circuits. Figure 20 shows the function of each terminal as viewed from the rear panel.
Terminals 1 and 2 are for transmit audio input with a nominal 600 Ω impedance. Terminals 3 and 4 provide a receive audio output with a nominal 600 Ω impedance. Pins 5 and 6 provide an external keying source. Shorting pins 5 and 6 keys the radio.
Refer to Figure 22 on Page 24 for information on connecting the radio to a VOX assembly.
Figure 20. 4-Wire Audio Connector, J2
PIN 2— RXD
PIN 3— TXD
PIN 4— +5 Vdc
PIN 5— GROUND
PIN 7— RTS*
* Used when reprogramming the radio firmware with a PC
.
UNUSED UNUSEDUNUSED
UNUSED
RECEIVE AUDIO
600 OHM
4123 5 6
TRANSMIT AUDIO
600 OHM
EXTERNAL KEYLINE
(GROUND TO KEY RADIO)
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 23
Data Interface Connector—J3
The data connector on the radio’s rear panel is the main system data interface. It typically connects to the host computer. Refer to Figure 21 and Table 5 on Page 23 for pinout details. Refer to Figure 22 on Page 24 for information on connecting the radio to a VOX assembly.
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Figure 21. Data Interface Connector, J3
Table 5. Data Interface Pinout
Pin Number
Input/Output Pin Description
1— Shield Connection. Connects to ground (negative
supply potential) on the radio’s PC board.
2IN TXD—Transmitted Data. Accepts TX data from the
connected device.
3OUT RXD—Received Data. Sends received data to the
connected device.
4IN RTS—Request-to-Send Input. Keys the
transmitter when RTS is asserted.
5OUT CTS—Clear-to-Send Output. Active after the
programmed CTS delay time has elapsed.
6OUT DSR—Data Set Ready. Provides a +6 Vdc DSR
signal through a 2.5 kΩ resistor.
7-- Signal Ground. Connects to ground (negative
supply potential) at the radio’s PC board.
8OUT DCD—Data Carrier Detect. Activates when the
radio detects an on-frequency signal. 9 -- No Connection 10 -- No Connection 11 OUT Receive Audio Monitoring Connection (used for
diagnostics). Drives high-impedance load. 12 -- No Connection 13 -- No Connection 14 -- No Connection 15 OUT Do not connect—Reserved for future use. 16 -- No Connection 17 -- Do not connect—Reserved for future use.
1
13
25
14
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24 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Figure 22. x790 to VOX Assembly Interconnect Diagram
Orderwire Connector—J9
The radio provides for an orderwire channel to facilitate communica­tions between two associated MDS 4790/9790 radios. The jack accepts a standard telephone handset with a carbon microphone and an RJ-11 connector-equipped cable. See “Coordinating Activities by Orderwire”
on Page 27 for more information.
Alarm Contacts—J10
J10 is a plug-in terminal strip that provides connections for optional alarm circuits. Figure 23 shows the function of each terminal as viewed from the rear panel.
18 -- No Connection 19 OUT 14.0 Vdc Output. Provides a regulated supply
voltage at 1.5 A for low-power accessories. 20 -- No Connection 21 -- No Connection 22 -- No Connection 23 -- No Connection 24 -- Do not connect—Reserved for future use. 25 -- No Connection
Table 5. Data Interface Pinout (Continued)
Pin Number
Input/Output Pin Description
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 25
Terminals 1 and 2 provide solid state relay contacts that close when a minor alarm is detected. Terminals 3 and 4 provide relay contacts that close when a major alarm is detected. You can redefine these relay contacts using the radio’s software (switched from minor to major alarm outputs, or vice versa). The ASENSE command is used to change the relay contacts from normally open (
NO) to normally closed
(
NC). The contacts are rated for non-inductive loads up to a maximum
60 Volts (AC or DC) at 1 A.
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Figure 23. Alarm Relay Connections
MAJOR ALARM
RELAY
(NORMALLY OPEN)
MINOR ALARM
RELAY
(NORMALLY OPEN)
4123 5 6
PINS 5 &6 RESERVED FOR
FUTURE USE—DO NOT CONNECT
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26 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
4.7 Post Installation Checks
Before applying power to the radio, verify that:
1. All connections are properly wired and secure.
2. The input voltage matches that of the installed power supply.
3. Antenna heading is preset in the direction of the associated station. This completes the radio installation. Section 5.0, START-UP AND
OPERATION describes the radio’s indicators and provides initial startup
procedures.
5.0 START-UP AND OPERATION
The radio is designed for continuous, unattended operation. Under normal conditions, the only time operator intervention is required is to power the unit up or down, or to change an operating parameter. This section explains the use of the radio’s indicators and provides steps for initial startup of the equipment.
5.1 Initial Startup
NOTE: The radio is normally continuously keyed, and transmits when
the power is switched on. Ensure there is a suitable load on the antenna connector before switching the power on.
Operation of the radio can be started by simply connecting primary power to the unit and setting the rear panel POWER switch to ON.
Normal Indications
When power is first applied, the following events occur in a normally working unit:
• All front panel indicators light briefly and a beep is emitted
• The front panel display shows the start-up screen, similar to
Figure 26 on Page 29
• The
ACTIVE LED for the selected transceiver board lights. In a
master station configured for redundant operation, the
STBY
LED also lights for the stand-by unit.
Maximizing RSSI
Since the master station almost always uses an omni-directional antenna, maximizing signal strength is done at the remote sites where directional antennas are typically used. An RSSI stronger than -90 dBm is desirable.
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 27
Coordinating Activities by Orderwire
The orderwire channel can be very useful in coordinating the set-up and testing of two MDS 4790/9790 radios set up in a Polling Remote system configuration. With a telephone handset plugged into the ORDERWIRE jack (J9) on the radio’s rear panel, technicians can talk to each other freely by merely speaking into the handset.
You can plug a telephone handset with a carbon microphone element into J9 on the rear panel to communicate with someone at the radio link. Handsets suitable for use with the radio are available from GE MDS (Part No. 12-1307A01).
Normal system operation is unaffected if all you do is listen over the handset. However, when you speak into the handset, the radio applies transmit audio to an automatic voice-operated transmit keying (VOX) circuit, keying the transmitter.
At the same time, the VOX circuit switches off external transmit data, interrupting the normal flow of data in the system. Transmit audio from the handset is then applied to the transmitter. Your voice is then heard through a handset at the remote radio. Since any noise over the handset interrupts transmission, you should unplug the handset when it is not in use.
Troubleshooting Tip You can listen to network data activity using the handset. While humans
cannot interpret the data by ear, the normal characteristics of the data exchanges between the master station and remotes can be learned. Once you know the “normal” pattern, you can recognize some changes as abnormal. To prevent the interruption of payload data, remove or dis­able the handset mouthpiece (microphone element). Using a handset as an activity monitor is no substitute for electronic test equipment such as a bite-error (BER) tester.
5.2 Front Panel Indicators
Refer to Figure 24 on Page 28 and the following text for an explanation of the front panel indicators. The control buttons are described in
Section 6.4, Configuration and Programming using the Front Panel,
beginning on Page 60.
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28 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Invisible place holder
Figure 24. Front Panel Controls and Indicators
LED Indicators
You can check the basic operation of the transceiver board(s) by viewing the LED indicators on the front panel. The top row of indicators shows the status of the “A” transceiver board; the bottom row shows the status of the “B” transceiver board. On a redundant radio (spare trans­ceiver board and power supply installed), the references given here apply to transceiver board A and B equally.
Normally, only the green ACTIVE LED (and, in master stations config­ured for redundant operation, one of the yellow STBY LEDs) are lit. All other red LEDs are alarm indicators. If lit, they indicate a potential problem in the radio system.
Refer to Figure 25, Table 6 on Page 29, and the text that follows for a detailed explanation of the LED indicators.
Invisible place holder
Figure 25. LED Indicators
ENTER
ESCAPE
LED INDICATORS LCD DISPLAY PROGRAMMING
AND CONTROL KEYS
ACTIVE STBY ALARM RX ALR TX ALR
I/O ALR
ACTIVE STBY ALARM RX ALR TX ALR
I/O ALR
A
B
A B
ACTIVE STBY ALARM RX ALR TX ALR I/O ALR
ACTIVE STBY ALARM RX ALR TX ALR I/O ALR
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 29
NOTE: Additional LEDs are located behind the removable front panel.
They are intended primarily for troubleshooting the radio, and are not required for basic operation. These LEDs are described in “Local Problem-Solving” on Page 80.
Front Panel Display
At initial power-up, the front panel display shows the start-up screen (Figure 26). After a period of time without activity, the front panel dis­play darkens. The display is restored by pressing any of the front panel buttons.
Invisible place holder
Figure 26. Start-up Screen (typical)
The start-up screen displays the owner’s name and message. Customers typically use these fields to display the system name and site name. Other screens, and the use of the control buttons, are described in
Section 6.5, Screen Descriptions, beginning on Page 64.
Table 6. Explanation of Front Panel LEDs
LED Name Color Meaning When Lit
ACTIVE
Green Transceiver board (A or B) is the selected unit.
STBY
Yellow Transceiver board (A or B) is currently in stand-by mode
(functional on master station configured for redundant operation only).
ALARM
Red A major or minor alarm event has occurred. Use the
front panel’s Active Radio Status screen to list current alarm events (refer to “Active Radio Status” on Page
77).
RX ALR
Red Difficulty receiving—may be due to an antenna problem,
receiver fault, or other condition causing no or a weak received signal level.
TX ALR
Red Transmit circuitry fault.
I/O ALR
Red A data framing or parity error has occurred over the data
port.
MDS 4790 MAS Radio
OWNERS NAME OWNERS MESSAGE
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30 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
6.0 DIAGNOSTICS AND CONTROL
Configuration, control and diagnostics of the master station is per­formed by connecting a Windows PC running a terminal program or other GE MDS diagnostics software to a diagnostic port on the rear of the unit (Figure 27). If a PC is not available, you can perform many of the same functions using the front panel interface, described in
Section 6.4, Configuration and Programming using the Front Panel,
beginning on Page 60.
Figure 27. PC Connected to the Master Station
This section explains how to connect a PC to the master station, and describes the commands you can use for programming and diagnostics.
6.1 PC Connection
1. Set Jumper J15 (on the vertical Interface Board) to “PC.” This removes 14 V from Pin 6 of the
DIAGNOSTIC PORT
.
TO DB-9
DIAGNOSTICS
CONNECTOR (J1)
TO COMPUTER'S
RS-232 CONNECTOR
COMPUTER
RUNNING INSITE
SOFTWARE
J15
ENSURE JUMPER J15 (INSIDE RADIO) IS SET TO "PC"
(On Vertical Interface Board)
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 31
2. Connect a DB-9 to DB-9 cable (Figure 28) between the PC and the radio’s rear panel DIAGNOSTIC PORT (Figure 27 on
Page 30).
Figure 28. PC Diagnostic Cable (DB-9 to DB-9)—
MDS P/N 97-1971A04
3. Install a terminal emulation program, such as HyperTerminal™ or MDS InSite™ software (MDS P/N 03-3533A01), if such a program is not already installed.
4. Launch the terminal program or diagnostics software.
a. If you are using InSite, follow the instructions given in the pro-
gram’s user guide.
b. If you are using a terminal emulation program:
Press the Space or Esc key several times, at one-second intervals, until the > prompt is shown, indicating that the command interface is ready to accept input. The diagnostic interface has an automatic baud-rate detector which synchronize with your data rate.
If the unit does not recognize your data interface arrangement, try the following settings:
• Data Bits = Eight
• Parity = None
• Stop Bits = 1
• Data Rate = 9600 bps
• Flow Control = None
• Terminal Emulation/Mode = ANSI
NOTE: The DIAGNOSTIC PORT supports autobaud at 2400, 4800,
9600, 19200, and 38400 bps baud rates.
DB-9 MALE CONNECTOR TO RADIO
DB-9 FEMALE CONNECTOR TO PC
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32 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
5. Type the command, then press ENTER. Command input is not case sensitive.
Press the Backspace key to delete characters. The system displays one or more lines of confirmation text. These
responses are listed in Tables 7 through 9 beginning on Page 34.
You can leave the diagnostics software and PC running, or you can exit from the diagnostics software, power-down the PC, and disconnect the PC from the radio.
Connecting Multiple Masters at One Site
If you have more than one master station located at a single site, it is pos­sible to connect all of them to one EIA/RS-232 computer connection for local diagnostics and control. Support for this “multidrop” service is built into the radio through the use of the Multiple Address (MADDR) command. This method is not intended for use in systems where the radios are not physically connected, such as in a microwave backbone arrangement.
MDS x790 master stations equipped with version 1.7 or higher firmware contain a built-in COS (Code Operated Switch). You only need to pro-
gram this switch with a proper Multiple Address (MADDR) to be used with InSite (version 6.3 software or higher). For a detailed description of the networking arrangement, refer to the InSite™ NMS software manual (MDS P/N 05-3696A01). This manual is available for download from the GE MDS Web site (www.GEmds.com).
Operating Tips • After establishing a connection to the radio, enter the command
DUMP. The response is a complete listing of the current radio config-
uration. This will help you make a quick review of the current set­tings and help you identify the ones you want to change.
• You can also save this portion of your terminal session for future reference after you have configured the radio to suit your needs.
6.2 PC Command Summaries
GE MDS radios are preconfigured with operating parameters that enable them to operate in most situations. Should you need to adjust your radio, either for a specific situation or to resolve a problem, this section describes commands for changing radio operating parameters.
Tables 7 through 9 summarize master station commands.
• Table 7 (Page 34) summarizes commands for setting radio operating parameters and displaying status and other informa­tion.
• Table 8 (Page 35) summarizes diagnostic and testing com- mands.
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 33
• Table 9 (Page 36) summarizes commands for obtaining information about the unit.
Refer to Section 6.3, Detailed Command Descriptions, beginning on
Page 37 for detailed information about these commands.
Commands and Command Parameters
You can use most commands in two ways: Typing only the command:
For example: REPEATER
displays the current information. Typing the command, followed by a space and a parameter value:
For example: REPEATER ON
implements a radio parameter change. Parameters and their meanings are listed in the summary tables, as well in the detailed command descriptions which follow.
The following conventions are used in the tables:
• Command parameters, if any, are shown in brackets [ ] follow­ing the command entry.
• A string of lower-case “x”s in a command parameter stands for a letter or number key.
• “xxx.xxxxx” stands for a decimal number (the decimal point position might vary).
• “mm,” “dd,” and “yyyy” stand for month, day and year, respec­tively (the number of characters used for month and year might vary).
• “hh,” “mm,” and “ss” stand for hours, minutes and seconds, respectively.
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34 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Table 7. PC Commands—Radio Operation
TERMINAL
COMMAND
FRONT
PANEL MENU
DESCRIPTION
BATT(ery) [ON/OFF]
Details, page 41
Battery Backup
Details, page 73
Enable or disable alarms derived from monitor­ing the internal back-up battery.
BAUD [xxxxx abc]
Details, page 42
Baud Rate/Format
Details, page 70
Set or display communication attributes for the data interface port
xxxxx=Baud rate (110, 300, 1200, 2400, 4800, 9600, 19200, 38400)
a=7 or 8 data bits
b=N for none, O for odd, E for even parity
c=1 or 2 stop bits
BUFF [ON/OFF]
Details, page 42
Data Buffering
Details, page 74
Enable or disable received data buffering
ON=Seamless data
OFF=Fast byte throughput
CKEY [ON/OFF]
Details, page 43
Continuous Keying
Details, page 72
Enable or disable continuous keying
ON=Continuous keying enabled
OFF=Continuous keying disabled
CTS [0-255]
Details, page 43
Clear-to-Send D elay
Details, page 70
Set or display CTS delay . Setting a value of 0 keeps CTS normally asserted.
DATAKEY [ON/OFF]
Details, page 44
Key On Data
Details, page 73
Toggle between key-on-data and key-on-RTS
ON=Key-on data
OFF=Key-on RTS
DATE [mmm dd yyyy]
Details, page 44
Set Date
Details, page 77
Set or display the current date
DMGAP [xx]
Details, page 45
None Set the amount of time to wait after receiving a
character before interpreting the next received character as the start of a new message
EMP [ON/OFF]
Details, page 46
Emphasis
Details, page 70
Enable or disable pre-emphasis and de-emphasis
INIT
Details, page 46
None Set all operating parameters to default settings
MODEM
[NONE/4800/9600/1920 0/DEFAULT]
Details, page 48
Modem
Details, page 69
Set or display the radio’s modem type, or spec­ify analog input
PTT [0-255]
Details, page 50
Push-to-Talk Delay
Details, page 70
Set or display PTT delay
PWR [20–37]
Details, page 51
Output Power Setting
[37-20]
Details, page 69
Set or display forward power output setting
RADIO [AUTO/A/B]
Details, page 51
Radio Selection
Details, page 78
Set or display the active transceiver board
REPEATER [ON/OFF]
Details, page 51
Repeater Mode
Details, page 71
Enable or disable repeater mode
RXMUTE
[ON/OFF/Time in msec]
Details, page 53
RX Mute Mode
Details, page 72
Set or display RX (receive) Muting status
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RX [xxx]
Details, page 52
Receive Frequency
Details, page 69
Set or display receive frequency
RXLEVEL [–20 to +3]
Details, page 53
Receive Level [–20 to +3]
Details, page 75
Set or display the analog audio receive level in
dBm
RXP AD [ON/OFF]
Details, page 53
Receive Pad
Details, page 75
Enable or disable RX pad
RXTOT [NONE, 1-1440]
Details, page 53
RX Timeout [NONE, 1-1440]
Details, page 71
Set or display the receiver timeout timer
SCD [0-255]
Details, page 54
Transmit Timeout
Details, page 71
Set or display the soft-carrier dekey delay
TIME [hh:mm:ss]
Details, page 57
Set Time
Details, page 77
Set or display the current time
TOT [ON/OFF, 1-255]
Details, page 58
Transmit Timeout
Details, page 71,
Transmit Timeout Dura­tion
Details, page 71
Set or display the timeout timer delay
TX [xxxx]
Details, page 58
Transmit Frequency
Details, page 68
Set or display the transmit frequency
TXGAIN [ON/OFF]
Details, page 59
Transmit Gain
Details, page 75
Enable or disable TX gain
TXLEVEL [–20 to +3, AUTO]
Details, page 59
Transmit Level [–20 to +3, AUTO]
Details, page 74
Set or display the analog audio tr ansmit level in
dBm
Table 8. PC Commands—Diagnostics
PC COMMAND
FRONT
PANEL MENU
DESCRIPTION
ALARM
Details, page 37
Active Radio Status
Details, page 77
Display current alarm status in hexadecimal
format
AMASK [0000 0000–FFFF FFFF]
Details, page 40
Alarm Masks
Details, page 75
Set or display the major alarm mask
NMASK [0000 0000–FFFF FFFF]
Details, page 49
None Set or display the minor alarm mask
ASENSE [HI/LO]
Details, page 41
None Set or display the sense of the alarm bits
(active high or active low)
LOG [CLR]
Details, page 48
Event Log
Details, page 79
Clear Logs
Details, page 79
Display or clear the event log
DLINK [ON/OFF/xxxx]
Details, page 45
None
Enable or disable network-wide diagnostics
and set the baud rate at the RJ-11 DIAG port
DTYPE [NODE/ROOT/GATE/PE ER]
Details, page 46
None
Set up a radio as a root, node, gate, or peer
radio
KEY
Details, page 47
Manual Key
Details, page 72
Enable the transmitter
Table 7. PC Commands—Radio Operation (Continued)
TERMINAL COMMAND
FRONT
PANEL MENU
DESCRIPTION
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DKEY
Details, page 45
Manual Key
Details, page 72
Disable the transmitter
MADDR [NONE, 1–255]
Details, page 48
Multi-Drop Address (MADDR)
Details, page 72
Unit address for use with GE MDS’ InSite NMS software, where multiple master stations are connected together at one location
RSSI, RSSI!
Details, page 52
Receive Signal Strength
Details, page 77
Display received signal strength indication
RTU [ON/OFF/0-80]
Details, page 52
None Enable or disable the radio’s internal RTU sim-
ulator for diagnostics, and set the internal RTU address
SHOW [DC/PWR/CUR­RENT/RADIO]
Details, page 54
None Display various readings:
SHOW DC ......................DC IN xx.x V
........................................DC OUT x.x V
SHOW PWR................... RF POWER xx DBM
SHOW CURRENT..........LNA xxx mA
........................................TOTAL xxx mA
SHOW RADIO................ RADIO A is active
.......................................RADIO B is not
.......................................equipped
SNR, SNR!
Details, page 55
S/N Ratio
Details, page 78
Display signal-to-noise ratio (from DSP’s chan­nel equalizer)
STAT
Details, page 56
Active Radio Status
Details, page 77
Display current alarm event descriptions
TEMP
Details, page 57
Show Temperature and Voltages
Details, page 78
Display the internal radio temperature
Table 9. PC Commands—
Owner and Radio Information
PC COMMAND
FRONT PANEL
MENU
DESCRIPTION
OPT
Details, page 50
None
Display a list of available options and the cur­rent status of each:
Diagnostics:.....................................OFF
Digital Modem:.................................OFF
OWM [xxxxx]
Details, page 50
Set Owner Message
Details, page 76
Set or display an owner message or the system name
OWN [xxxxx]
Details, page 50
Set Owner Name
Details, page 76
Set or display the owner name or site name
HREV
Details, page 46
None Display the hardware revision number
MODEL
Details, page 48
None Display the radio’s model number (includes
TX/RX band characteristics)
SER
Details, page 54
Serial Number
Details, page 78
Display the radio’s serial number
Table 8. PC Commands—Diagnostics (Continued)
PC COMMAND
FRONT
PANEL MENU
DESCRIPTION
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 37
6.3 Detailed Command Descriptions
This section gives more detailed information for most commands listed in the previous tables. The commands are cross-referenced to descrip­tions of corresponding commands entered using the front panel display and control buttons (see radio graphic at left).
Alarm Summary ALARM
The ALARM and STAT commands report on current alarms. ALARM pro- vides alarm information in a concise, two-line format. Alarm codes are summarized in hexadecimal format. STAT (described on Page 56) includes a text message describing each alarm.
The first line of the response to the ALARM command is a simple message indicating whether or not alarms are present. The second line is a hexa­decimal numeric code representing the system alarm state. Examples of responses are:
SREV
Details, page 55
Software Revision
Details, page 78
Display software revision information
UNIT [10000–65000]
Details, page 59
Unit Diagnostic Address
Details, page 59
Display the radio’s unit address
Table 9. PC Commands—
Owner and Radio Information (Continued)
PC COMMAND
FRONT PANEL
MENU
DESCRIPTION
A B
Data Buffering screen, Page 74
This graphic points you to the corresponding front panel menu
NO ALARMS PRESENT CODE: 0000 0000
MINOR ALARMS PRESENT CODE: xxxx xxxx
MAJOR ALARMS PRESENT CODE: xxxx xxxx
Active Radio Status screen, Page 77
A B
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Each bit of the hexadecimal response code represents a unique alarm event. The first 4-digit number indicates major alarm conditions; if there are no major alarms, this number is 0000. The second 4-digit number represents minor alarm conditions; if there are no minor alarms, this number is 0000.
Code values for individual major alarm conditions are given below:
Table 10. Major Alarm Conditions’ Hexadecimal Values
Alarm Code
(HEX)
Alarm Code
(Binary)
Event Code
Description
4000 0000 0100 0000 0000 0000 0000 0000 0000 0000 1 The hardware configuration disagrees
with the software.
2000 0000 0010 0000 0000 0000 0000 0000 0000 0000 2 The model number is not
programmed.
1000 0000 0001 0000 0000 0000 0000 0000 0000 0000 3 Authorization fault (radio option not
available).
0800 0000 0000 1000 0000 0000 0000 0000 0000 0000 4 One or both of the programmable
synthesizers is reporting an “out of
lock” condition. 0400 0000 0000 0100 0000 0000 0000 0000 0000 0000 13 The transmitter timed out. 0200 0000 0000 0010 0000 0000 0000 0000 0000 0000 6 A/D fault 0100 0000 0000 0001 0000 0000 0000 0000 0000 0000 7 One or more of the radio’s internal
voltage regulators is reporting a
failure. The radio will not work. 0080 0000 0000 0000 1000 0000 0000 0000 0000 0000 8 The system has not been calibrated.
Factory calibration is required for
proper operation of the system. 0040 0000 0000 0000 0100 0000 0000 0000 0000 0000 MCU/DSP 0020 0000 0000 0000 0010 0000 0000 0000 0000 0000 10 The radio was unable to properly
program itself to the appropriate
defaults. There may be a hardware
problem. 0008 0000 0000 0000 0000 1000 0000 0000 0000 0000 12 The receiver timed out.
0001 0000 15 Output power fault.
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Code values for individual minor alarm conditions are given below:
Monitoring Alarms on the Standby Radio
There is a limited ability to monitor alarms on the standby radio without using InSite software. You accomplish this using the command line interface.
The ALARM, STAT, and SER commands take an optional parameter [A | B]:
• If you enter the command without the parameter, the response applies to the active radio.
• If you enter the command with the [A] parameter, the response always applies the the A radio.
Table 11.Minor Alarm Conditions’ Hexadecimal Values
Alarm Code
(HEX)
Alarm Code
(Binary)
Event Code
Description
0000 8000 0000 0000 0000 0000 1000 0000 0000 0000 16 The unit address has not been
programmed.
0000 4000 0000 0000 0000 0000 0100 0000 0000 0000 17 A data parity fault has been detected
on the DB25. This usually means there is a parity setting mismatch between the radio and the RTU.
0000 2000 0000 0000 0000 0000 0010 0000 0000 0000 18 A data framing error has been
detected on the DB25. This sometimes means there is a baud rate mismatch between the radio and the RTU.
0000 0800 0000 0000 0000 0000 0000 1000 0000 0000 20 Configuration error. The modem
setting is incorrect.
0000 0015 21 Unit is running on back-up battery
power.
0000 0016 22 Standby radio hardware not installed
or available.
0000 0040 0000 0000 0000 0000 0000 0000 0100 0000 25 The 10-volt power regulator output is
out of tolerance. If the voltage is too far out of tolerance, the radio might not work.
0000 0020 0000 0000 0000 0000 0000 0000 0010 0000 26 The DC input supply voltage is out of
tolerance. If the supply voltage is too far out of tolerance, the radio might not work.
0000 0010 27 LNA current fault (LNA current is out of
range).
0000 0008 28 Total board current fault (total board
current is out of range).
0000 0001 0000 0000 0000 0000 0000 0000 0000 0001 31 The radio’s internal temperature is
approaching an out-of-tolerance condition. If the temperature drifts outside of the recommended operating range, the radio might not work.
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• If you enter the command with the [B] parameter, the response always applies the the B radio.
To determine which radio is the standby, use the SHOW RADIO command, which indicates which radio (A or B) is ACTIVE. It also indicates if the opposite slot is INACTIVE or NOT EQUIPPED.
Major Alarm Event Assignments
AMASK [0000 0000–FFFF FFFF]
Table 10 and Table 11 on Page 39 list the major and minor alarm clas-
sifications. It is possible to reassign alarm outputs (illustrated in
Figure 19 on Page 22) to a different category, and change which alarm
events trigger an automatic switchover in redundant master stations. However, this should be done rarely, if ever.
The AMASK command and NMASK command (Page 49) reclassify major and minor alarm events, respectively, changing the alarm output relay status and switchover conditions. These commands can be used to tailor a radio’s alarm response. For example, a major alarm at a redundant master station causes switch-over to the other transceiver board. By re-configuring a minor alarm as a major alarm, you can force a switch-over at the occurrence of a (formerly) minor alarm condition.
Reclassifying alarms does not disable alarm notification. The front panel ALARM LED illuminates, the alarm event is logged, and the ALARM and STAT commands show the alarm status.
Entering the AMASK command alone displays the current setting of major alarm events in hexadecimal format. Entering the AMASK com­mand followed by an eight-digit hexadecimal number reassigns each of the 32 possible alarm events as enabled or disabled, with respect to major alarm output relay status and switchover criteria.
The hex value for the mask corresponds to the hex value for the ALARM command (see the
ALARM command description). Each bit represents a
different major or minor alarm. The most significant 16 bits represent specific major alarms and the least significant 16 bits represent specific minor alarms. All major and minor alarms are “set” as the default AMASK.
NOTE: GE MDS does not use all bits. Some bits are reserved for
future use.
The default AMASK is FFFF FFFF, which signals an alarm on the data port pin 25 for all major and minor alarms. To disable the alarm signal on pin 25 for a specific alarm, reset the bit associated to the specific alarm and convert back to hex. Table 10 and Table 11 on Page 39 pro­vide the hex and binary values for each alarm code.
Alarm Masks screen, Page 75
A B
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Example:
To make the x710 signal an alarm on the DB25 for all major alarms and all minor alarms except when it has a Data Framing Error (event code
18), the AMASK becomes:
AMASK (default)
= FFFF FFFF (Hex) = 1111 1111 1111 1111 1111 1111 1111 1111 (Binary)
AMASK (new)
= 1111 1111 1111 1111 1101 1111 1111 1111 (Binary)
= FFFF DFFF (Hex) The only bit that you do not set is specific to the alarm you want to mask. Contact GE MDS for more information on configuring the alarm
response.
Alarm Sense ASENSE [HI/LO]
The ASENSE command displays or sets the logic characteristics of the alarm outputs at the ALARM RELAY connector (see “Alarm Contacts—
J10” on Page 24).
Entering the ASENSE command alone shows whether the alarm output is currently actively high or low.
Entering the ASENSE command followed by HI or LO resets the alarm output to the normally closed or normally open state.
ASENSE HI= Contact set to be normally open ASENSE LO = Contact set to be normally closed
The default for a radio with a single transceiver board is normally open (
ASENSE HI).
Battery Backup Monitoring & Alarm
BATT(ery) [ON/OFF]
Use the BATT command to configure the monitoring of the internal back-up battery voltage (condition) and whether the radio sends an alarm when it is operating from the internal back-up battery, or when the voltage falls below 13 Vdc.
BATT ON=Enable monitoring and alarm generation BATT OFF=Disable monitoring and alarm generation
Battery Backup screen, Page 70 xxxxx
A B
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Data Interface Baud Rate
BAUD [xxxxx abc]
The BAUD command displays or sets the communication attributes for the DATA INTERFACE port. The command has no effect on the RJ-11
DIAG(nostics) port.
Entering the BAUD command alone displays the baud rate along with asynchronous data attributes. Entering the BAUD command followed by one or more parameters resets the data port attributes.
BAUD xxxxx abc
Example: BAUD 4800 8N1
The first parameter, xxxxx, is the baud rate. Baud rate is specified in bits-per-second, and must be one of the following rates: 110, 300, 1200, 2400, 4800, 9600, 19200, or 38400.
The second parameter of the BAUD command is a 3-character block spec­ifying asynchronous data attributes:
a = Data bits (7 or 8) b = Parity (N for None, O for Odd, E for Even) c = Stop bits (1 or 2)
The factory default setting is 9600 baud, 8 data bits, no parity, 1 stop bit.
NOTE: 7N1, 8O2, and 8E2 are invalid communication settings. If the data rate is faster than the radio’s baud rate setting, the DATA Port
accepts a minimum of 500 data bytes in a single continuous data trans­mission. At baud rates of 9600 bps or less, the radio supports unlimited continuous data transmission. Under this condition, the
DATA Port hand-
shaking (CTS) would keep toggling on/off for a long transmission, or the buffer might be able to absorb a smaller amount of data. Avoid mis-matched data rates whenever possible.
Data Interface Buffering
BUFF [ON/OFF]
This command displays or sets the received data handling mode. Entering the
BUFF command alone shows whether the mode is seamless
(
ON), or fast byte throughput (OFF). Entering the BUFF command fol-
lowed by a parameter resets the received data handling mode. The ON parameter sets the radio to seamless data mode. The OFF parameter sets the radio to fast byte throughput mode. The default is seamless data mode.
Baud Rate/Format screen, Page 70
A B
Data Buffering screen, Page 74
A B
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 43
The setting of this parameter affects the timing of received data sent from the DATA INTERFACE connector. Data trans- mitted over the air by the radio is unaffected by the BUFF setting.
If data buffering is set to OFF, the radio operates with the lowest possible average latency. The radio sends data bytes from the DATA INTERFACE port as soon as it disassembles an incoming RF data frame. Average and typical latency are both below 10 ms, but idle character gaps might be introduced into the outgoing data flow.
If data buffering is ON, the radio operates in a seamless mode. That is, the radio sends data bytes over the air as quickly as possible, but the receiver buffers the data until enough bytes have arrived to cover worst-case gaps in transmission. Data buffering might introduce a 2 ms delay, but the radio will not create any gaps in the output data stream. This mode of operation is required for protocols such as MODBUS™, that do not allow gaps in their data transmission.
NOTE: Seamless mode (BUFF ON) is intended only for applications
where the transmitter’s baud rate is greater than or equal to the receiver’s baud rate. Enforcement of this rule is left up to the user.
Continuous Transmitter Keying
CKEY [ON/OFF]
The CKEY command enables or disables continuous keying. When CKEY is enabled (ON), the radio is continuously keyed. The CKEY command is normally enabled when the radio is in a full-duplex master configura­tion.
Data Interface Clear-to-Send Period
CTS [0-255]
This command displays or sets the timer value associated with the CTS line response. Entering the
CTS (Clear-to-Send) command without a
parameter displays the timer value in milliseconds. Entering the CTS command with a parameter ranging from 0 to 255 sets the timer value in milliseconds. The timer value function depends on the radio’s operating mode (DCE or CTS Key). See the DEVICE command for more informa­tion about these operating modes.
When the radio is in DCE mode, the timer specifies how long to wait after the RTS line goes high before asserting the CTS line. A timer value of zero means the CTS line will go high immediately following RTS.
Continuous Keying screen, Page 72
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Clear-to-Send Delay screen, Page 70
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44 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
When the radio is in CTS Key mode, the timer specifies how long to wait after asserting the CTS before sending data from the DATA INTER-
FACE
port. A timer value of zero means that data will be sent from the data port without imposing a keying delay. Other delays may be present, depending on how other operating parameters are configured.
Should you experience problems with repeater operation after changing the CTS, PTT or SCD values, contact GE MDS.
Transmitter Keyed on Incoming Data
DATAKEY [ON/OFF]
This command displays or sets the keying mode. In key-on-data mode, the radio automatically keys itself whenever input data arrives on the DB25 port. In key-on-RTS mode, the radio only keys in response to an RTS or PTT signal (or the
KEY command).
Entering the DATAKEY command alone shows whether the keying mode is key-on-data (ON) or key-on-RTS (OFF). Entering the DATAKEY com- mand followed by a parameter controls whether or not the radio will automatically key on receipt of data. The default mode is key-on-data (ON).
NOTE: Key-on-data mode is only applicable when the input data
source is digital. When the input data source is analog, the
DATAKEY setting is irrelevant.
Event Log Date Format
DATE [mmm dd yyyy]
This command sets or displays the date. The accuracy of the date and time are important, because event codes are “stamped” with the date and time (refer to “TIME [hh:mm:ss]” on Page 57).
Enter the command without any parameters to display the date. Enter the command in any of the following formats to reset the date:
DATE mmm dd yyyy DATE mm-dd-yyyy DATE mm/dd/yyyy
where mmm is a three-character abbreviation of the month:
Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
dd is a two-digit number from 01 to 31 representing the day, and yyyy is the year.
Key On Data screen, Page 73
A B
Set Date screen, Page 77
A B
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 45
Dekey Transmitter DKEY
This command deactivates the transmitter after it has been keyed with the KEY command. If other keying sources are still active, then the trans­mitter will not dekey, but the manual key request is removed.
Diagnostics Link DLINK [ON/OFF/xxxx]
This command disables or re-enables network-wide diagnostics at the local radio, and sets the baud rate at the radio’s RJ-11
DIAG port. Net-
work-wide diagnostics is enabled by default. Entering
DLINK ON enables network-wide diagnostics. Entering
DLINK OFF disables network-wide diagnostics.
Use the DLINK command locally, at the radio, to enable network-wide diagnostics functionality as well as set the baud rate at the RJ-11 DIAG port.
DLINK followed by the baud rate sets the baud rate (bps) of the RJ-11
DIAG port. The following baud rate selections are allowed:
• 2400
• 4800
• 9600
• 19200 (default setting)
Example: DLINK 4800 sets the RJ-11 DIAG port to operate at 4800 bps. The same baud rate must be entered into the InSite Equipment List’s
BAUD field.
The default setting is DLINK ON.
Diagnostics Message Gap Time
DMGAP [xx]
The DMGAP command sets the amount of time in milliseconds to wait after the receipt of a character before interpreting the next received char­acter as the start of a new message. When baud rates are slow, the gap between characters within a poll might be so long that the radio inter­prets the next character as the start of a new poll. When diagnostics is performed using passive rather than active messaging (see “Performing
Network-Wide Radio Diagnostics” on Page 84), use this command to
prevent these errors.
Manual Key screen, Page 72
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46 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Unit Diagnostic Service
DTYPE [NODE/ROOT/GATE/PEER]
This command configures a radio’s type for network-wide diagnostics. For most radio systems, it is sufficient to define a radio as a root or node radio. The root radio is the radio connected to the host computer for non-intrusive diagnostics functions. Specify only one root per radio net­work.
The GATE and PEER settings are used for complex radio networks and are included to accommodate network-wide diagnostics in simplex and spe­cial radio network configurations.
Entering DTYPE NODE configures the radio as a node radio. Entering DTYPE
ROOT configures the radio as a root radio. Entering the DTYPE command alone
displays the current setting. The default setting is
NODE.
Refer to Section 7.2, Performing Network-Wide Radio Diagnostics,
beginning on Page 84. Refer to the GE MDS Network-wide Diagnostics
Handbook (P/N 05-3467A01) for a complete explanation of remote
diagnostics.
TX & RX Emphasis EMP [ON/OFF]
Use this command to enable or disable pre-emphasis and de-emphasis on the analog input and output signals.
Pre-emphasis is a function used in older analog radios where the trans­mitter’s modulating signal is increased at the higher frequencies to increase system performance. De-emphasis compensates at the receiver for a transmitted signal that has had pre-emphasis applied.
ON indicates that pre-emphasis and de-emphasis are enabled, and OFF
indicates that pre-emphasis and de-emphasis are disabled.
Hardware Revision Level
HREV
This command displays the hardware revision level.
Initialize to Factory Defaults
INIT
This command resets customer-programmable settings back to factory defaults:
Emphasis screen, Page 70
A B
Table 12. Defaults for User-Configurable Parameters
Function Value
Alarm Mask—Major (AMASK) FFFF 0000 Alarm Mask—Minor (NMASK) 0000 FFFF Alarm Sense—(ASENSE) Active Open (High) Buffer Mode On
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 47
Key Radio Transmitter
KEY
This command activates the transmitter. See also the DKEY command.
Continuous Key (CKEY) Off Data Baud Rate A: 9600
C: 19200
E: 4800 Data Format 8N1 (8 data bits, no parity, 1 stop bit) Device Behavior DTE Diagnostics Message Gap (DMGAP) 3 ms Key-on-Data Mode (DATAKEY) On Modem
Analog:
None (N/A for MDS 4790E)
Digital:
MDS x790A: 9600 MDS 4790C: 19200 MDS x790E: 4800
Owner’s Message “Blank” Owner’s Name “Blank” Power Output 37 dBm (5 W) Pre/De-Emphasis Control Off PTT Delay 0 msec Radio Selection Auto
(with redundant hardware installed) Repeater Mode Disabled RTS/CTS delay 0 msec RTU Simulator (RTU) Off RX Level –10 dB RX Mute Off Soft-Carrier Dekey (SCD) 0 msec Timeout-Timer 30 seconds (ON) TX Level Auto Unit Diagnostic Service (DTYPE) Node
Table 12. Defaults for User-Configurable
Function Value
Manual Key screen, Page 72
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48 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Operation Log LOG [CLR]
This command displays or clears a list of the last 800 operating changes, called “system events.” These events include alarm notifications, as well as normal operator actions such as turning the power on or off. In many cases, you can review the events leading up to a failure to help determine the cause of a problem.
Entering the LOG command without any parameters displays the entire event history. Entering LOG CLR or LOG CLEAR clears all current events from the log history.
Multiple-Drop Address
MADDR [NONE, 1–255]
The radio’s Multi-Drop Address uniquely identifies this radio on an RS-232 COS (code-operated switch) bus connected to the rear panel’s
DIAGNOSTIC PORT, J1. The unit’s address initially is set as NONE, for a
computer directly connected to the DIAGNOSTIC PORT of one radio.
MADDR addresses can range from 1...255. The master station will ignore
diagnostic messages sent to other Multi-Drop Addresses. With the
MADDR address programmed, MDS’ InSite™ network management
system software can poll master stations through the COS bus to receive the master unit’s diagnostic information. The MADDR command works on MDS x790 master stations with software version 1.7 or later installed. For more details, see “Connecting Multiple Masters at One
Site” on Page 32.
Display Unit Model Number Code
MODEL
This command displays the radio’s model number. The characters and numbers, and their position in the code sequence, identifies the product options and configuration of the radio at the time of manufacture. It is helpful to have this code and the unit serial number available when com­municating with the factory for technical assistance.
Payload Data Modem Configuration
MODEM [NONE/4800/9600/19200/DEFAULT]
This command sets the radio’s signal type and modulation mode.
NONE—No modem is installed, or it is desired to use the unit as
an analog transceiver using Transmit Audio Input (Pin 9) and Receive Audio Output (Pin 11). See “4-Wire Audio
Connector—J2” on Page 22 for 4-WIRE AUDIO INTERFACE
Event Log screen, Page 79
Clear Logs screen, Page 79
A B
Multi-Drop Address (MADDR) screen, Page 72
A B
Modem screen, Page 69
A B
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 49
connector pinouts when the unit uses the digital modem mode. Review the RXLEVEL command on Page 53 and the TXLEVEL command on Page 59 for guidance on setting appropriate levels.
9600—9600 bps modem speed (used for MDS 4790A/E and
MDS 9790A)
4800—4800 bps modem speed (used for MDS 4790E) 19200—19200 bps modem speed (used for MDS 4790C) DEFAULT—Default modem speed for radio (model dependent)
Minor Alarm Event Assignments
NMASK [0000 0000–FFFF FFFF]
Table 10 and Table 11 list the major and minor alarm classifications. It
is possible to reassign alarm outputs (illustrated in Figure 19 on
Page 22) to a different category, and to change which alarm events
trigger an automatic switchover in redundant master stations. However, this should be done rarely, if ever.
The AMASK command (Page 40) and NMASK command reclassify major and minor alarm events, respectively, changing the alarm output relay status and switchover conditions. Use these commands to tailor a radio’s alarm response. For example, a major alarm at a redundant master sta­tion causes switch-over to the other transceiver board. By reconfiguring a minor alarm as a major alarm, a minor alarm condition can force a transceiver board switch-over.
Reclassifying alarms does not disable alarm notification. The front panel ALARM LED illuminates, the alarm event is logged, and the ALARM and STAT commands show the alarm status.
Entering the NMASK command alone displays the current setting of minor alarm events in hexadecimal format. Entering the
NMASK com-
mand followed by an eight-digit hexadecimal number reassigns each of the 32 possible alarm events as enabled or disabled, with respect to minor alarm output relay status and switchover criteria.
The hex value for the mask corresponds to the hex value for the ALARM command (see the
ALARM command description). Each bit that is a ‘1’
identifies the associated alarm event as a major alarm. Each bit that is a ‘0’ means that the alarm condition will not cause an alarm output relay to assert, and will not cause a transceiver board switch over.
Contact GE MDS for more information on configuring the alarm response.
Alarm Masks screen, Page 75
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50 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Options Installed OPT
The OPT command lists each upgradable option and shows whether it is installed (
ON) or not-installed (OFF). For example:
You can implement several optional features through the use of a soft­ware “authorization code” that you can purchase from the factory. The availability of options depends on what hardware is installed and what features are permitted by the telecommunications regulatory body in your country. Please contact the factory for further information.
Owner’s Message OWM [xxxxx]
The OWM command allows for display or entry of an optional text mes­sage such as the system name. The entry can contain up to 30 characters and will appear on the default screen of the front panel interface.
Owner’s Name OWN [xxxxx]
The OWN command allows for display or entry of an optional text mes­sage such as the site name. The entry can contain up to 30 characters and will appear on the default screen of the front panel interface.
Push-to-Talk Keying Delay
PTT [0-255]
This command sets or displays the amount of time to wait after the radio receives a keying signal from either the PTT (Push-to-Talk) or RTS (Request-to-Send) lines before actually keying the transmitter. Entering the
PTT command without a parameter displays the timer value associ-
ated with the keying delay selection. Entering the PTT command with a parameter ranging from 0 to 255 sets the timer value in milliseconds. A timer value of zero means that the radio keys immediately following the keying signal.
The command is applicable for DCE operation, when the radio is keyed either by the PTT signal or by RTS. The command is not applicable
when the radio is keyed by the
KEY command.
Diagnostics : ON Premium Options : OFF Digital Modem : ON
Set Owner Message screen, Page 76
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Set Owner Name screen, Page 76
A B
Push-to-Talk Delay screen, Page 70
A B
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 51
Transmitter Power Output Level
PWR [20–37]
This command sets or displays the master station’s RF forward output power setting. Entering the PWR command without a parameter displays the forward output power in dBm. Entering the PWR command with a parameter ranging from 20 to 37 (verify using the OPT command) sets the forward output power in dBm. The default setting is 37 dBm, which is equivalent to 5 watts.
To read the radio’s actual (measured) power output, use the SHOW PWR command.
NOTE: The RF power output of MDS 4790E ETSI certified radios is
fixed at 5 watts. No adjustment is possible.
Active Radio Selection
RADIO [AUTO/A/B]
This command sets or displays the transceiver board selection. When you select RADIO AUTO, automatic switchover is enabled. If a major alarm is detected and a redundant radio is operational, control automat­ically switches to the alternate radio. Use the RADIO AUTO setting even if there is only one transceiver board installed. This allows you to easily upgrade the master station at a future date by simply inserting another transceiver board.
Entering the RADIO command without a parameter shows the equipped active/inactive status for both the A and B radios.
Example: >RADIO Radio response:RADIO A
RADIO A IS ACTIVE RADIO B IS INACTIVE
Entering the RADIO command with a parameter of A or B forces the active transceiver board to the A or B transceiver board and disables standby
redundancy.
RADIO A or RADIO B settings should rarely be used; they are
provided mainly for diagnostic test purposes.
Repeater Mode REPEATER [ON/OFF]
This command sets or displays whether the radio is configured as a repeater. Entering the REPEATER command without a parameter displays the current setting (ON = repeater; OFF = not a repeater). Entering the
REPEA TER command followed by ON enables radio operation as a
repeater;
OFF disables operation as a repeater.
Output Power Setting [37-20] screen, Page 69
A B
Radio Selection screen, Page 78
A B
Repeater Mode screen, Page 71
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52 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Received Signal Strength Indicator
RSSI, RSSI!
These commands display the Received Signal Strength Indication in dBm units. The output can range from –50 dBm to –120 dBm.
RSSI is a raw signal level indicator, updated in real-time in a 1-second interval. The RSSI command causes the DIAGNOSTIC PORT to enter an RSSI update mode. The DIAGNOSTIC PORT provides an updated RSSI output line with a 2-second refresh rate. The DIAGNOSTIC PORT stays in this mode until you press the Enter key on the PC.
The RSSI! command provides a one-time reading and display of RSSI at the diagnostic port.
Remote Terminal Unit Simulator
RTU [ON/OFF/0-80]
This command enables or disables the radio’s internal RTU simulator, which runs with GE MDS’ proprietary diagnostics software. The internal RTU simulator is an optional feature which is not available on all radios; use the
OPT command to see whether DIAGNOSTICS is ON
(internal RTU simulator was purchased for the radio) or OFF (not avail­able on this radio).
You can also use this command to set the RTU’s address. Use the internal RTU for testing system payload data and pseudo bit error rate testing. It can help you isolate a problem to either the external RTU or a transceiver board.
For more information on using the RTU simulator in a polling environ­ment, refer to Publication 05-3467A01.
Receive Frequency RX [xxx]
This command displays or changes the radio’s receive frequency. Nor­mally, the radio ships to the customer programmed with the cus­tomer-specified frequency. If you did not specify the operating frequency when the radio was ordered, the RX frequency is set to the center of the radio’s operating band (refer to Section 2.6, Model Number
Codes, beginning on Page 6 for the model’s operating band).
If you change the receive frequency more than 5 MHz from the factory’s setting, the receiver’s front-end helical filters must be re-tuned. If you also change the transmitter frequency, review the duplexer guidelines in
Section 8.4, Operating Frequency Change Considerations, beginning
on Page 89 before implementing any change.
Receive Signal Strength screen, Page 77
A B
Receive Frequency screen, Page 69
A B
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 53
Received Data Audio Level
RXLEVEL [–20 to +3]
The RXLEVEL and TXLEVEL (Page 59) commands control the audio level settings when the radio is operating in analog mode. When used alone, the RXLEVEL command displays the receive level in dBm. Entering the
RXLEVEL command followed by a number from –20 to +3 resets the
audio level in dBm.
NOTE: The RXLEVEL and TXLEVEL commands are only available on the
“A”/analog model radios.
Receiver Muting RXMUTE [ON/OFF/Time in msec]
Use this command to set or display the radio’s receive (RX) muting status. Receive muting might be required when you configure the radio as a full-duplex polling remote communicating through a repeater. It prevents the radio from hearing its own transmissions (“echoes”) from the repeater, which might cause software application errors.
Entering the RXMUTE command without a parameter shows whether the muting feature is ON (enabled) or OFF (disabled). Entering the RXMUTE command followed by ON enables muting; entering OFF disables it.
After issuing the RXMUTE ON command, you can specify a receive muting time. Use the RXMUTE nn command, where nn is a time in milli­seconds. This causes the receive muting feature to assert for nn millisec­onds following the end of a transmission.
Receive Data Attenuator
RXPAD [ON/OFF]
This command enables or disables the receive attenuator for the receive audio level on radios operating in the analog mode. Entering the RXPAD command without a parameter shows whether the attenuator is
ON
(enabled) or
OFF (disabled). Entering the RXPAD command followed by
ON enables the receive attenuator; entering OFF disables it.
Receiver Timeout-Timer
RXTOT [NONE, 1-1440]
The
RXTOT command selects or displays the receive timeout timer value
in minutes if the receiver fails in a way that generates no other alarms (for example, if data is not detected within the specified time). This timer triggers an alarm (event 12) and forces a switch-over to the standby transceiver board.
Receive Level [–20 to +3] screen Page 75
A B
RX Mute Mode screen, Page 69
A B
Receive Pad screen, Page 75
A B
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Entering the RXTOT command without a parameter displays the timer value in minutes. Entering the RXTOT command with a parameter ranging from 1 to 1440 resets the timer in minutes. Entering the RXTOT command with the parameter NONE disables the timer. The default value is NONE.
Soft-Carrier Dekey SCD [0-255]
The “soft-carrier dekey” command sets or displays the amount of time to wait after a de-key request before actually de-keying the radio’s trans­mitter.
Entering the SCD command without a parameter displays the timer value in milliseconds. Entering the SCD command with a parameter ranging from 0 to 255 resets the timer in milliseconds. The default setting is 0, which means that the radio de-keys immediately following removal of a keying signal (see “Simplex and Switched Carrier Operation” on
Page 4).
If you experience problems with repeater operation after changing the
CTS, PTT, or SCD values, contact GE MDS Technical Support.
Serial Number SER
This command displays the radio’s serial number as recorded at the fac­tory.
Show Selected Parameters
SHOW [DC/PWR/CURRENT/RADIO]
The SHOW command discloses different types of radio information, depending on the command parameter entered. These are:
•
DC—Displays DC input/output voltages.
• PWR—Displays the actual (measured) RF power output in dBm. Unlike the PWR command, this command shows the actual level measured, not the programmed RF power setting.
• CURRENT—Shows the low noise amplifier and total board cur­rent.
• RADIO—Shows the currently active radio (A or B).
Transmit Timeout screen, Page 71
A B
Serial Number screen, Page 78
A B
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 55
Signal-to-Noise Ratio
SNR, SNR!
These commands display the signal-to-noise ratio in dB. GE MDS’ def­inition of signal-to-noise is based upon the signal level following equal­ization, for valid data frames only. A valid frame contains no more than one bit-error, and belongs to a packet addressed for the receiving radio. SNR is updated and latched for each valid packet received. A filter in the DSP reduces the effect of any sudden changes in the value.
The output ranges from 10 dB to 33 dB. A value of 10 dB represents a weak or no signal. A value of 24 dB represents a very strong signal.
The SNR command causes the diagnostic port to enter an SNR update mode. The DIAGNOSTIC PORT displays an updated SNR output line at roughly a 2 second interval refresh rate. The diagnostic port stays in this mode until you press the Enter key at the PC.
The SNR! command provides a one-time reading and display of SNR at the diagnostic port.
Software (firmware) Revision Level
SREV
SREV displays the software release number, revision and build date:
Command Input Response
SHOW DC DC IN xx.x V - Power applied to radio
DC OUT x.x V - Regulated output from
U116 (10 V regulator)
SHOW PWR RF POWER xx dBm SHOW CURRENT LNA xxx mA - Current consumption of
LNA
TOTAL xxx mA - Total radio current
SHOW RADIO B RADIO IS ACTIVE
A RADIO IS [INACTIVE|NOT EQUIPPED]
S/N Ratio screen, Page 78
A B
06-3321A01
1.0.0 ddmmmyyyy
Software Revision screen, Page 78
A B
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56 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Standby Hardware Configuration
STANDBY [ON/OFF]
Use the STANDBY command to notify the monitoring processor of the presence of a second radio assembly within the chassis so that it can switch to the alternate radio if the primary radio assembly fails.
STANDBY ON = Chassis is equipped with two radio assemblies STANDBY OFF = Chassis equipped with only one radio assembly
Responses to the STANBY command are:
STANDBY DEFINED = The chassis is equipped with two
radio assemblies
STANDBY NOT DEFINED = The chassis is equipped with only
one radio assembly
Alarm Status Display
STAT
The STAT command provides a user-friendly, interactive way to view alarm status (the ALARM command [Page 37] summarizes alarm codes in hexadecimal format).
If no alarm event conditions are active, the message NO ALARMS
PRESENT is shown. If alarms are present, they are shown in ascending
order starting with the lowest event number:
Major alarms are displayed first, followed by minor alarms. The command output shows the event number, major/minor status, and
a one- or two-line text message. If additional alarm events are active, the
MORE> prompt is shown.
• Press the Enter key to display the next alarm event
• Enter QUIT, Q, or a period (.) to return to the command prompt
Standby Equipment screen, Page 73
A B
Event: 26 (MINOR) DC input power is not in valid
range
Active Radio Status screen, Page 77
A B
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 57
The table below gives the text message displayed by the
STAT command for each alarm event.
Unit’s Internal Temperature
TEMP
This command displays the radio’s internal temperature in degrees Cel­sius. Note that the radio is designed to operate in a range from –30 C° to +60 C°, and may fail at temperatures outside this range. This internal reading might be higher than the outside temperature by several degrees.
Clock Formatting TIME [hh:mm:ss]
This command sets or displays the time in 24-hour format. The accuracy of the date and time are important because events are logged with the date and time (see “DATE [mmm dd yyyy]” on Page 44).
Table 13. Text Messages of Alarm Event Codes
Event
Number
Text Message
01 Hardware mismatch 02 Model number not programmed 03 Authorization fault 04 Synthesizer out-of-lock 06 A/D fault 07 Voltage regulator fault detected 08 Radio not calibrated 10 EEPROM write failure 12 Receiver timeout 13 Transmitter timeout 15 Output power fault 16 Unit address not programmed 17 Data parity error 18 Data framing error 20 Configuration error 25 10V regulator output not in valid
range 26 DC input power is not in valid range 27 LNA current is not in valid range 28 Board current not in valid range 31 Internal temperature not in valid
range
Show Temperature and Voltages screen, Page 78
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Set Time screen, Page 77
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58 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Enter the command without any parameters to display the time. Enter the command in the following format to reset the time:
TIME hh:mm:ss
where hh is a two-digit number from 00-23 representing the hour (00 is 12:00 am;
12 is 12:00 pm; and 23 is 11:00 pm), mm is a two-digit number
from 00 to 59 representing the minute, and ss is a two-digit number from 00 to 59 representing the second.
Transmit Timeout­Timer
TOT [ON/OFF, 1-255]
The Transmit Timeout Timer limits the time a radio can remain contin­uously keyed. If a radio remains keyed for longer than the timer dura­tion, the transmitter automatically de-keys. The radio must transition to the de-keyed state before accepting a new keying request.
The TOT command entered without a parameter displays the timer value in seconds.
To enable the timer, enter TOT ON. To disable the timer, enter TOT OFF. The default is TOT ON.
To set the timer value, enter the TOT command followed by a parameter ranging from 1 to 255 (seconds). The default is 30 seconds.
Transmit Frequency TX [xxxx]
This command displays or changes the radio’s transmit frequency. Nor­mally, the radio ships to the customer programmed with the cus­tomer-specified frequency. If you did not specify the operating frequency when the radio was ordered, the TX frequency is set to the center of the radio’s operating band (see Section 2.6, Model Number
Codes, beginning on Page 6 for the model’s operating band).
If the transmit frequency is changed more than 100 kHz from the fac­tory’s setting, review the duplexer guidelines in Section 8.4, Operating
Frequency Change Considerations, beginning on Page 89.
Transmit Timeout screen, Page 71
A B
Transmit Timeout Duration screen, Page 71
A B
Transmit Frequency screen, Page 68
A B
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 59
Transmit Data Audio Gain Enhancement
TXGAIN [ON/OFF]
This command enables or disables the transmit audio boost for the transmit audio level in radios operating in analog mode using J2: 4-WIRE
AUDIO INTERFACE
. Entering the TXGAIN command without a parameter
shows whether the audio boost is ON (enabled) or OFF (disabled). Entering the TXGAIN command followed by ON enables audio boost; entering OFF disables it.
NOTE: The RXLEVEL and TXLEVEL commands are only available on the
“A”/analog model radios.
Transmit Data Audio Level
TXLEVEL [–20 to +3, AUTO]
Use the TXLEVEL and RXLEVEL (Page 53) commands to control the audio level settings when using the analog mode for equipment connected to the 4-WIRE AUDIO CONNECTOR (J2). When used alone, the TXLEVEL command displays the transmit level in dBm. Entering the TXLEVEL command followed by a number from –20 to +3 (inclusive) resets the audio level in dBm. Entering the TXLEVEL command followed by AUTO causes the radio to set the transmit level automatically. The default set­ting is AUTO.
Evaluate system performance in the AUTO mode. In most cases, this setting provides satisfactory performance. If it does not, evaluate the BER at the other settings.
Unit Diagnostic Address
UNIT [10000–65000]
This command sets or displays the radio’s unit address, which uniquely identifies a single radio within a network in support of a network man­agement system (NMS) program, such as MDS’ InSite™.
The default unit address is the last four digits of the radio’s serial number. User-programmable unit addresses can range 10000...65000 (addresses in the 0...9999 range are reserved for use by the factory). Once you change the default unit address, it cannot be reprogrammed.
NOTE: The Unit Address operates independently from the Multi-Drop
Address (“Multiple-Drop Address” on Page 48).
Transmit Gain screen, Page 75
A B
Transmit Level [–20 to +3, AUTO] screen, Page 74
A B
Unit Address screen, Page 73
A B
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60 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
6.4 Configuration and Programming using the Front Panel
If you cannot connect a PC running GE MDS diagnostics software to the radio, use the front panel display and controls to review and change operating parameters and perform diagnostics. This section explains how to use the front panel controls and screens. Cross-references to the corresponding PC-based commands are included.
The front panel display has two modes: “safe” mode (display only), and configuration mode. These modes are changed by defining the user access level. When the radio is powered on, the front panel display is in safe mode. The front panel display mode, and the brightness and con­trast of the front panel display, are the only changes that can be made to the radio in safe mode. The front panel display reverts to safe mode after a period of time has elapsed without a button press, whenever the radio is powered back on, and whenever a switchover occurs.
Normally, if no button activity occurs for one hour, the LCD display reverts to a power saving mode. The only exception is the Operating Status screen. This is a special screen, found under the Diagnostics main menu. This screen displays key status, RSSI, and SNR (if applicable). The screen does not time-out, and is preserved during power outages and radio switchovers.
Changing the front panel display to configuration mode is described in
“Switching the Front Panel Display to Configuration Mode” on Page 63.
Figure 29 on Page 61 provides an overview of the front panel screens.
Each screen displays a single piece of information or radio function. The screens are divided into configuration, diagnostics, and event log func­tions. Individual screens are described in more detail in Section 6.5,
Screen Descriptions, beginning on Page 64.
The flowchart shown in Figure 29 is intended to be a feature guide, and is subject to additions, deletions, or other modifications according to the software revision installed in the radio.
Table 14. Front Panel Display’s
“Safe” Mode vs. “Configuration” Mode
Changes to... When… Configurable Pa-
rameters
Access Level
Safe Mode Radio is powered on
A period of time has elapsed without a button pressed
Display mode (safe/configuration)
Display brightness Display contrast
None
Configuration Mode
Access level is set to “User” All parameters User
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 61
Invisible place holder
Figure 29. Front Panel Screen Flowchart
ENTER
ENTER
ENTER
TO CHANGE SETTING:
ENTER
ENTER
TO CHANGE
SETTING:
MDS 4790 MAS Radio
OWNERS NAME
OWNERS MESSAGE
ESCAPE
Clear Logs
CONFIGURATION
SCREENS (CONTINUED)
RADIO START-UP
ENTER
ESCAPE
ESCAPE
ENTER
ENTER
ENTER
TO CHANGE
SETTING:
ENTER
ESCAPE
MDS 4790 MAS Radio ≥Configuration Diagnostics Event Log
Unit Address
6682
Standby Equipment
Not Defined
MADDR
231
Battery Backup
Not Defined
Continuous Keyed
Disabled
Manual Keyed
Disabled
Data Buffering
Disabled
Key On Data
Emphasis
disabled
Clear to Send Delay
25 milliseconds
Push to Talk Delay
0 milliseconds
Soft Carrier De-key
0 milliseconds
Transmit Timeout
enabled
Transmit
55 Seconds
RX Timeout
none
Repeater Mode
disabled
RX Mute Mode
disabled
RX Mute Mode
Disabled
Enabled
Diagnostic Link
enabled
DLINK Baudrate
4800
Diagnostic Type
Root
TX Audio Level
-20 dBm
RX Audio Level
-20 dBm
Transmit Gain
disabled
Receive Pad
disabled
Alarm Masks
Major None Minor None
Alarm Sense is HI
Display Contrast
0 50 100
Backlight Intensity
0 50 100
Set Owner Message
North Master 2
Set Time
11:34:56 PM
June 12, 2003
Set Date
11:34:56 PM
June 12, 2003
Operating Status TX: dekeyed RSSI: –60 dBm S/N: 10 dB
Active Radio Status no alarms present
S/N Ratio
10 dB
Radio Selection
AUTO
Radio A is Active
Transmitter Status
dekeyed
Show Temp/Voltage
30° Celsius
14.7 Volts Input
10.1 Volts Output
Serial Number A: 12345678
B: NOT EQUIPPED
Software Revision
06-3321A01
2.2.0 15 Sept 2003
Set Owner Name OWNERS NAME
Transmit Frequency
457.99375
Set Access Level
User
Receive Frequency
463.49375
Output Power Setting
37 dBm
Modem
9600
Baudrate/Format
9600 8N1
Rx Signal Strength
-60 dBm
MDS 4790 MAS Radio Configuration Diagnostics ≥Event Log
MDS 4790 MAS Radio Configuration ≥Diagnostics Event Log
LOG 1 OF 1
6/1/2000 12:00:00
System Boot
ENTER
ENTER
MDS 4790 MAS Radio ≥Configuration
Diagnostics Event Log
NOTE: Chart is for reference only, and may not reflect the exact configuration of your radio.
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62 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Programming and Control Buttons
The programming and control buttons are located at the right side of the front panel. Use these butons to navigate through the front panel screens and, when the front panel display is in configuration mode, to make changes to radio operating parameters. Figure 30 shows a detailed view of these controls.
Invisible place holder
Figure 30. Programming and Control Buttons
• ENTER—When the start-up screen is shown, pressing this but­ton displays the Menu Directory screen. Otherwise, the ENTER button has no effect in safe mode. Its use in radio configuration is described in “Use of Control Buttons in Configuration Mode”
on Page 63.
• ESCAPE—Shows the previous screen in the menu hierarchy (start-up screen or menu directory). Its use in radio configura­tion is described in “Use of Control Buttons in Configuration
Mode” on Page 63.
• Up/down arrow buttons ( )—On the start-up screen, pressing the up or down arrow button shows the menu directory. On the menu directory screen (Figure 31), the up and down arrow buttons cycle a selection arrow (->) through the main menu items. On the individual menu screens, in safe mode, pressing the up or down arrow buttons shows the menu direc­tory.
• Left/right arrow buttons ( )—The left and right arrow buttons cycle the display through the selected menu’s screens.
Navigating Through the Front Panel Screens
Figure 29 on Page 61 shows the menu hierarchy, as well as the button
presses used to display the start-up and menu directory screens (navigate between individual screens with the right or left arrow buttons).
ENTER
ESCAPE
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 63
Invisible place holder
Figure 31. Menu Directory Screen
Displaying the menu directory
To display the menu directory when the start-up screen is shown, press the ENTER, up, or down arrow button once. The menu directory lists the three main menus—Configuration, Diagnostics, and Event Log.
Selecting a main menu item
Pressing the up or down arrow buttons cycles the selection arrow (->) through the main menu items.
Displaying the individual menu screens
When the selection arrow points to the desired menu, press the right or left arrow buttons to cycle through that menu’s screens. Each button press shows a new screen, until you have cycled through the entire menu and the menu directory is shown again.
To return to the menu directory from any menu screen, press the
ESCAPE, up or down arrow button once. Pressing any of these buttons
twice shows the start-up screen.
Switching the Front Panel Display to Configuration Mode
As explained in Table 14 on Page 60, the front panel display has two modes, safe mode and configuration mode. The front panel display is normally in safe mode. To activate configuration mode:
1. From the start-up screen, press the down arrow button to show the menu directory.
2. On the menu directory screen, press the right arrow button to show the Access Level screen.
3. Press the
ENTER button to initiate a radio operation change.
4. Press the down arrow button to display the other access level, USER.
5. Press the ENTER button to save the change.
Use of Control Buttons in Configuration Mode
In configuration mode, the control buttons provide additional functions:
•
ENTER—Starts and ends a change to radio functionality
(enables arrow buttons you can use for selections instead of nav­igation).
MDS 4790 MAS Radio
-> Configuration Diagnostics Event Log
Selection arrow
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64 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
• ESCAPE—Cancels the current radio functionality selection before you press the ENTER button a second time.
• Up/down arrow buttons ( )—Cycles through the avail­able choices. Pressing the ENTER button when a particular choice is displayed reconfigures the radio using that setting.
Changing radio functions
1. When an individual menu screen is shown, press the ENTER button. The message change pending appears at the bottom of the screen. This indicates that the next series of arrow button presses will make on-screen selections and will not display menu screens.
2. Most options are either words (“enabled,” “disabled”) or numbers. The instructions below apply in most situations; if not, the method for choosing an option is detailed in the screen description.
Word options. To display all choices when the options are words, press the up or down arrow button.
Numeric options. If the option is more than one digit, first select the digit to change: press the left or right arrow button to
move the cursor ( _ ) under the digit to change (for example, to change 30 to 40, move the cusor under the 3). Then press the up or
down arrow buttons to increase or decrease the number, or hold down the arrow button to scroll through choices more rapidly.
3. Press the ENTER button again when the desired choice is shown (or press the ESCAPE button to cancel the change). The message done appears, indicating that the change was successful.
6.5 Screen Descriptions
This section describes each front panel display screen. The commands refer to the descriptions of corresponding commands entered from a connected PC using the graphic at left.
These screens are presented in four major groups:
Group 1—Startup Screen and Menu Directory (page 68)
These screens are starting points for all programming and viewing activ­ities.
Group 2—Configuration Screens (Page 68)
Use the Configuration screens to view or define the radio’s operating parameters.
This graphic points you to the corresponding PC command
TX [xxxx] command, Page 58
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 65
Group 3—Diagnostic Screens (Page 77)
The Diagnostic screens display important status information for the local and remote radio, as well as run several tests useful in locating system problems.
Group 4—Event Log (Page 79)
The event log lists up to 800 of the most recent operating changes. These events include system problems, as well as normal operator actions such as turning the power on or off.
The following table organizes front panel screens in the same way as the PC commands described earlier in this manual: operating parameters, diagnostics, and radio information.
Table 15. Front Panel Screens—Configuration Parameters
FRONT P ANEL
SCREEN
TERMINAL
COMMAND
DESCRIPTION
Access Level
Details, page 68
Enable or disable configuration mode.
Alarm Masks
Details, page 75
AMASK [0000
0000–FFFF FFFF]
Details, page 40
NMASK [0000
0000–FFFF FFFF]
Details, page 49
ASENSE [HI/LO]
Details, page 41
Set or show hexadecimal code identifying
whether alarm events cause an alarm output relay to assert and cause the active radio to switch over; also displays the alarm sense.
Battery Backup
Details, page 73
BATT(ery) [ON/OFF]
Detailspage41
Enable or disable alarm generation when the
back-up battery falls below 13.0 Vdc.
Backlight Intensity
Details, page 76
Set or show front panel display’s background
brightness.
Baud Rate/Format
Details, page 70
BAUD [xxxxx abc]
Details, page 42
Set or show data interface port communica-
tion attributes.
Clear-to-Send Delay
Details, page 70
CTS [0-255]
Details, page 43
Set or show the time to wait after RTS is
asserted by the host computer before assert­ing the CTS line.
Continuous Keying
Details, page 72
CKEY [ON/OFF]
Details, page 43
Select continuous or non-continuous keying.
Data Buffering
Details, page 74
BUFF [ON/OFF]
Details, page 42
Enable or disable data buffering.
Display Contrast
Details, page 75
Set or show front panel display’s foreground
character intensity.
Emphasis
Details, page 70
EMP [ON/OFF]
Details, page 46
Enable or disable pre-emphasis and
de-emphasis.
Key On Data
Details, page 73
DATAKEY [ON/OFF]
Details, page 44
Set or show keying behavior (key-on-data or
key-on-RTS).
Multi-Drop Address (MADDR)
Details, page 72
MADDR [NONE, 1–255]
Details, page 48
Unit address for use with MDS’ InSite NMS
software, where multiple master stations are connected at one location.
Manual Key
Details, page 72
DKEY
Details, page 45
KEY
Details, page 47
Manually key or dekey the transmitter.
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66 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Menu Directory
Details, page 68
Select diagnostic, configuration, or event log
screens.
Modem
Details, page 69
MODEM
[NONE/4800/9600/19200/ DEFAULT]
Details, page 48
Set or show internal modem speed.
Output Power Setting [37-20]
Details, page 69
PWR [20–37]
Details, page 51
Set or show the transmit power output.
Push-to-Talk Delay
Details, page 70
PTT [0-255]
Details, page 50
Set or show the amount of time to wait after
the host computer asserts RTS b efore keying the radio and transmitting.
Radio Selection
Details, page 78
RADIO [AUTO/A/B]
Details, page 51
Set or show the active transceiver board;
enable or disable automatic switch-over.
Receive Frequency
Details, page 69
RX [xxx]
Details, page 52
Set or show the receive frequency.
Receive Level [–20 to +3]
Details, page 75
RXLEVEL [–20 to +3]
Details, page 53
Set or show the radio’s audio transmit level
when the radio operates in analog mode.
Receive Pad
Details, page 75
RXPAD [ON/OFF]
Details, page 53
Enable or disable the receive attenuator for
the receive audio level.
Repeater Mode
Details, page 71
REPEATER [ON/OFF]
Details, page 51
Enable or disable repeater mode.
RX Mute Mode
Details, page 72
RXMUTE [ON/OFF/Time
in msec]Detailspage 53
When on, prevents the radio from hearing its
own transmissions. Prevents errors in some software applications.
RX Timeout [NONE, 1-1440]
Details, page 71
RXTOT [NONE, 1-1440]
Detailspage53
Set or show the amount of time to wait wit hout
data receipt before generating an alarm and switching to the stand-by transceiver board.
Set Date
Details, page 77
DATE [mmm dd yyyy]
Details, page 44
Set or show the date.
Set Time
Details, page 77
TIME [hh:mm:ss]
Details, page 57
Set or show the time.
Standby Equipment
Details, page 73
STANDBY [ON/OFF]
Details, page 56
Enable or disable the monitoring of standby
equipment within the chassis.
Transmit Timeout
Details, page 71
SCD [0-255]
Details, page 54
Set or show amount of time to wait after a
de-key request before actually de-keying the radio.
Transmit Frequency
Details, page 68
TX [xxxx]
Details, page 58
Set or show the transmitter frequency.
Transmit Gain
Details, page 75
TXGAIN [ON/OFF]
Details, page 59
Enable or disable the transmit audio boost for
the transmit audio level.
Transmit Level [–20 to +3, AUTO]
Details, page 74
TXLEVEL [–20 to +3, AUTO]
Details, page 59
Set or show the radio’s audio transmit level
when the radio is in analog mode.
Transmit Timeout
Details, page 71
TOT [ON/OFF,
1-255]
Details page 58
Enable or disable the Transmit T i meout timer
(time to wait before disabling the transmitter to prevent unnecessary use of the frequency).
Transmit Timeout Dura­tion
Details, page 71
TOT [ON/OFF, 1-255]
Detailspage58
Set or show the Transmit Timeout duration
(time to wait before disabling the transmitter to prevent unnecessary use of the frequency).
Table 15. Front Panel Screens—Configuration Parameters
FRONT P ANEL
SCREEN
TERMINAL
COMMAND
DESCRIPTION
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Table 16. Front Panel Screens—Diagnostics
FRONT P ANEL
SCREEN
TERMINAL
COMMAND
DESCRIPTION
Active Radio Status
Details, page 77
STAT
Details, page 56
Show alarm conditions.
Clear Logs
Details, page 79
LOG [CLR]
Details, page 48
Clear the event log.
Event Log
Details, page 79
LOG [CLR]
Details, page 48
Show events logged by the active transcei ver
board.
S/N Ratio
Details, page 78
SNR, SNR!
Details, page 55
Show the signal-to-noise ratio in dBm.
Show Temperature and Voltages
Details, page 78
TEMP
Details, page 57
Show the radio’s internal temperature and
voltages.
Start-up Screen
Details, page 68
Show the radio name, owner name, owner
message, and any alarms.
Transmitter Status
Details, page 78
Show the transmitter state (k eyed or
dekeyed).
Table 17. Front Panel Screens—Owner and Radio Information
FRONT P ANEL
SCREEN
TERMINAL
COMMAND
DESCRIPTION
Serial Number
Details, page 78
SER
Details, page 54
Show the active transceiver board’s serial
number (not the radio serial number).
Set Owner Message
Details, page 76
OWM [xxxxx]
Details, page 50
Set or show the owner message or site name.
Set Owner Name
Details, page 76
OWN [xxxxx]
Details, page 50
Set or show the owner name or system name.
Software Revision
Details, page 78
SREV
Details, page 55
Show the internal software part number and
version number.
Start-up Screen
Details, page 68
Show the radio name, owner name, owner
message, and any alarms.
Unit Diagnostic Address
Details, page 59
UNIT [10000–65000]
Details, page 59
Show the radio’s unit address.
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GROUP 1—MAIN SCREENS Start-up Screen When the radio first powers on, or after a period of time has elap sed after the last
button press, the front panel shows the start-up screen. The start-up screen shows the product model number, as well as the owner’s name and message (typically, customers use the owner name and message fields to display the system and site name).
The screen dims after a period of time has elapsed without activity; restore brightness by pressing any button.
T o change what shows on this screen, see “Set Owner Name” on Page 76 and “Set
Owner Message” on Page 76.
Press ENTER, or the up or down arrow button, to show the Menu Directory screen. The screen dims after a period of time has elapsed without any activity; restore
brightness by pressing any button. T o change what shows on this screen, see “Set Owner Name” on Page 76 and “Set
Owner Message” on Page 76.
Press ENTER, or the up or down arrow button, to show the Menu Directory screen.
Menu Directory Use this screen to access three screen display cycles: Configuration,
Diagnostics, and Event Log. The selection arrow (
->) points to the currently
selected menu. Press the up/down arrow buttons to move the arrow to the desired menu, then
press the right/left arrow buttons to display each of that menu’s screens.
GROUP 2—CONFIGURATION Access Level Use this screen to set the front panel screen to configuration mode by selecting a
level of access. There are two levels:
NONE—This is the default setting upon power-up (“safe” mode). You can view all radio settings, change the access level, and change the front panel screen’s brightness and contrast. All other settings are shown only, and cannot be changed.
USER—Make changes to any radio parameter (“configuration” mode).
To select the USER access level, press ENTER, press the down arrow button to display the word “User,” then press ENTER again to make the change.
The radio returns automatically to safe mode (access level: NONE) after a period of time without a button press, or if the radio is powered off and then on.
Transmit Frequency
Use this screen to set or show the transmitter frequency. Normally, the radio ships configured with the customer-specified frequency. If you
did not specify the operating frequency when the radio was ordered, the factory sets the TX frequency to the center of the radio’s operating band. The range of frequencies for standard models are provided in Section 10.1, Technical
Specifications, beginning on Page 97.
To change the current frequency, press ENTER, then press the left/right arrow buttons to select a digit. Use the up/down arrow buttons to increase or decrease the number. Press ENTER to make the change.
MDS 4790 MAS Radio
OWNERS NAME OWNERS
MDS 4790A MAS
Radio
->Configuration Diagnostics Event Log
Set Access Level
User
Transmit Frequency
400.00000 MHz
TX [xxxx] command, Page 58
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 69
NOTE: Changing the transmitter’s operating frequency may resu lt in degraded or
out-of-specification performance. Review Section 8.4, Operating
Frequency Change Considerations, beginning on Page 89 before making a
change.
Receive Frequency
Use this screen to set or show the receive frequency. Normally, the radio ships programmed with the customer-specified frequency. If
you did not specify the operating frequency when the radio was ordered, the factory sets the RX frequency to the center of the radio’s operating band. The range of frequencies for standard models are provided in Section 10.1, Technical
Specifications, beginning on Page 97.
To change the current frequency, press ENTER, then press the left/right arrow buttons to select a digit. Use the up/down arrow buttons to increase or decrease the number. Press ENTER to make the change.
NOTE: Changing the receiver’s operating frequency may result in degraded or
out-of-specification performance. Review Section 8.4, Operating
Frequency Change Considerations, beginning on Page 89 before making a
change.
Output Power Setting [37-20]
Use this screen to set or show the transmit power output setting. Set power output from +37 dBm to +20 dBm.
To change this value, press ENTER, then use the left/right arrow buttons to select a digit. Use the up/down arrow buttons to increase or decrease the number . Refer to Table 18 to convert dBm to watts if necessary. Press ENTER to make the change.
Modem Use this screen to set or show the internal modem speed for compatibility with the
modem in the central host computer. To change the modem speed, press ENTER, then use the up/down arrow buttons
to show available modem speeds. Press ENTER to make the change. Review the Receive Level parameter on Page 75 and the Transmit Gain parameter
on Page 75 for guidance on setting appropriate levels.
Receive Frequency
400.00000 MHz
RX [xxx] command, Page 52
Output Power Setting
30 dBm
Table 18. dBm Vs. Watts
dBm Watts dBm Watts
+37 dBm 5.0 watts +27 dBm 500 milliwatts +35 dBm 3.2 watts +25 dBm 320 milliwatts +33 dBm 2.0 watts +23 dBm 200 milliwatts +31 dBm 1.25 watts +20 dBm 100 milliwatts +29 dBm 800 milliwatts
PWR [20–37] command, Page 51
Modem
4800
MODEM [NONE/4800/9600/19200/ DEFAULT] command,
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Baud Rate/Format Use this screen to set or show the communication attributes for the DATA
INTERFACE port. For a description of the communication attributes, see
BAUD
[xxxxx abc] command, Page 42.
To change the baud rate, press ENTER, then press the left arrow button to move the cursor under the baud rate. Use the up/down arrow buttons to select a new baud rate.
T o change the data format, press ENTER, then press the right arrow button one or more times to move the cursor (_) under the character to change. Use the up/down arrow buttons to change the character. Repeat for the other characters in the data format if necessary. Press ENTER to make the change.
Emphasis Use this screen to enable or disable pre-emphasis and de-emphasis on the analog
input and output signals. Pre-emphasis is a function used in older analog radios where the modulating signal
is increased (at the transmitter) at the higher frequencies to increase system performance. De-emphasis compensates (at the receiver) for a signal that has had pre-emphasis applied.
To enable or disable pre-emphasis and de-emphasis, press ENTER, then use the up/down arrow buttons to show ENABLED or DISABLED. Press ENTER to make the change.
Clear-to-Send Delay
Use this screen to set or show the Clear-to-Send Delay. This specifies the amount of time to wait after RTS is asserted by the host computer on the data port before asserting the CTS line. When the delay is 0, data is sent from the data port without imposing a keying delay.
To change the delay, press ENTER, then use the left/right arrow buttons to select the digit to change. Use the up/down arrow buttons to increase or decrease the digit. Repeat for the other digits if necessary. Press ENTER again to make the change.
Push-to-Talk Delay Use this screen to set or show the Push-to-Talk Delay. This is the amount of time
to wait after RTS is asserted by the host computer before the radio is keyed and transmits. When the delay is 0, the radio keys immediately following the keying signal.
To change the delay, press ENTER, then use the left/right arrow buttons to select the digit to change. Use the up/down arrow buttons to increase or decrease the digit. Repeat for the other digits if necessary. Press ENTER again to make the change.
Baudrate/Format
9600 8N1
BAUD [xxxxx abc] command, Page 42
Emphasis
enabled
EMP [ON/OFF] command, Page 46
Clear to Send Delay
0 milliseconds
CTS [0-255] command, Page 43
Push to Talk Delay
0 milliseconds
PTT [0-255] command, Page 50
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 71
Soft-Carrier De-key Delay
Use this screen to set or show the Soft-Carrier Dekey Delay. This specifies the amount of time to wait after a de-key request before actually de-keying the radio. When the delay is 0, the radio de-keys immediately following removal of a keying signal.
To change the delay, press ENTER, then use the left/right arrow buttons to select the digit to change. Use the up/down arrow buttons to increase or decrease the digit. Repeat for the other digits if necessary. Press ENTER again to make the change.
Transmit Timeout Use this screen to show the Transmit T imeout setting, and to enable or disable this
timer. When you enable this timer, it disables the transmitter after a set period of time to prevent unnecessary use of the frequency. If you configure the radio for continuous keying (see “Continuous Keying” on Page 72), the Transmit Timeout Timer is automatically disabled.
To enable or disable the timer , press ENTER, then use the up/down arrow buttons to display ENABLED or DISABLED. Press ENTER to make the change.
See the following command to change the timer delay.
Transmit Timeout Duration
Use this screen to set or show the Transmit Timeout duration. This is the amount of time to wait before disabling the transmitter to prevent unnecessary use of the frequency. If you configure the radio for continuous keying (see “Continuous
Keying” on Page 72), Transmit Timeout is automatically disabled.
To change the duration, press ENTER, then use the left/right arrow buttons to select the digit to change. Use the up/down arrow buttons to increase or decrease the digit. Repeat for the other digit if necessary. Press ENTER again to make the change.
RX Timeout [NONE, 1-1440]
Use this screen to set or show the RX Timeout Timer duration. This is the amount of time to wait (in minutes) after the last data receipt before switching to the stand-by transceiver board and generating an alarm.
To change the duration, press ENTER, then use the left/right arrow buttons to select the digit to change. Use the up/down arrow buttons to increase or decrease the digit. Repeat for the other digit if necessary. Press ENTER again to make the change.
To disable the Receive Timeout Timer, set the duration to NONE.
Repeater Mode Use this screen to set or show the radio’s operation as a repeater. When the radio
is set to operate as a repeater, the screen shows “enabled” (repeater mode is enabled). When the radio is a non-repeater, the screen shows “disabled” (repeater mode is disabled).
T o change the operating mode, press ENTER, then use the up/down arrow buttons to select ENABLE (repeater mode) or DISABLE (non-repeater mode). Press ENTER again to make the change.
Soft Carrier De-key
0 milliseconds
SCD [0-255] command, Page 54
Transmit Timeout
enabled
TOT [ON/OFF, 1- 25 5] command, Page 58
Transmit Timeout
30 seconds
TOT [ON/OFF, 1-255] command, Page 58
RX Timeout
none
Repeater Mode
enabled
REPEATER [ON/OFF] command, Page 51
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72 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
RX Mute Mode Use this screen to set or show the radio’s RX (receive) Muting status. RX muting
might be required when the radio is configured as a full-duplex polling remote communicating through a repeater. RX muting prevents the radio from hearing its own transmissions (“echoes”), which causes errors in some software applications. The default RX Mute time is 5 milliseconds. You cannot change this value from the front panel, but you can change it using RXMUTE nn command from a PC interface (see icon below).
T o change the RX Mute status, press ENTER, then use the up/down arrow buttons to select ENABLE (RX Mute on) or DISABLE (RX Mute off). Press ENTER again to make the change.
Continuous Keying
Use this screen to set or show the radio’s keying mode (continuous or non-continuous keying). Typically, set a master station for continuous keying. If continuous keying is disabled, key the radio with Pin 4 (RTS) of the interface connector.
T o change the keying mode, press ENTER, then use the up/down arrow buttons to select ENABLE (continuous keying) or DISABLE (non-continuous keying). Press ENTER again to make the change.
Manual Key Use this screen to manually key or dekey the transmitter. Show the transmitter
state by selecting Transmitter Status from the Diagnostics menu (Page 78). T o key the transmitter , press ENTER, then use the up/down arrow buttons to select
ENABLE (manual keying). Press ENTER again to key the transmitter. To dekey the transmitter, press ENTER, then use the up/down arrow buttons to
select DISABLE (manual de-keying). Press ENTER again to dekey the transmitter.
Multi-Drop Address (MADDR)
The radio’s Multi-Drop Address uniquely identifies this radio on an RS-232 COS (code-operated switch) bus connected to the rear panel’s DIAGNOSTIC PORT , J1. The unit’s address initially is set as NONE, for a computer directly connected to the DIAGNOSTIC PORT of one radio. MADDR addresses can range from 1 to 255. The master station ignores diagnostic messages sent to other Multi-Drop Addresses.
With the MADDR address programmed, MDS’ InSite™ network management system program can poll master stations through the COS bus to receive diagnostic information from the master unit itself. The MADDR command works on MDS x790 master stations with software version 1.7 or later installed. For more details, see “Connecting Multiple Masters at One Site” on Page 32.
NOTE: The Multi-Drop Address is not the same as the radio’s Unit Address
described below.
RX Mute Mode
disabled
RXMUTE [ON/OFF/Time in msec] command, Page 53
Continuous Keying
enabled
CKEY [ON/OFF] command, Page 43
Manual Key
disabled
KEY command, Page 47 DKEY command, Page 45
MADDR
134
MADDR [NONE, 1–255] command, Page 48
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 73
Unit Address The unit address identifies the radio as a unique unit within a network managed by
MDS’ InSite™ NMS software or similar program. This address is independent of the Multi-Drop Address (above) and is needed only for local and over-the-air diagnostics and control services of this unit through an NMS program such as InSite.
The default unit address is the last four digits of the radio’s serial number. User-programmable unit addresses can range 10000...65000 (addresses in the 0 to 9999 range are reserved for factory use). Once you change the default unit address, it cannot be reprogrammed.
NOTE: The Unit Address operates independently from the Multi-Drop Address.
(See “Multiple-Drop Address” above for details).
Standby Equipment
Use this screen to notify the monitoring processor of the presence of a second radio assembly within the chassis so that it can switch to the alternate radio unit if a failure of the primary radio assembly occurs.
To identify the available hardware, press ENTER, then use the up/down arrow buttons to select:
defined, if the chassis is equipped with two radio assemblies not defined, if the chassis equipped with only one radio assembly
The unit does not know if there are one or two radio transceiver assemblies installed. Make sure you know what hardware is installed before making a change.
Battery Backup Use the Battery Backup screen to set or show the monitoring of the internal
back-up battery voltage (condition) and if you want the radio to send an alarm when the radio is operating from the internal back-up battery or the voltage falls below 13 Vdc.
Battery Backup “not defined” means the battery is not installed or you do not desire to monitor its condition. “defined” indicates that monitoring is enabled and an alarm message will be created when the battery voltage is less than 13 Vdc.
T o set the radio to monitor the internal back-up battery, press ENTER, then use the up/down arrow buttons to select “defined”. Press ENTER again to make the change. To set the radio to ign ore the battery condition, press ENTER, then use the up/down arrow buttons to select “not defined”. Press ENTER again to make the change.
Key On Data Use this screen to set or show the radio’s keying mode (key-on-data, or
key-on-RTS). In key-on-data mode, the radio automatically keys itself whenever input data arrives on the DB-25 port. In key-on-RTS mode, the radio will only key in response to an RTS or PTT signal.
To set the radio to key-on-data mode, press ENTER, then use the up/down arrow buttons to select ENABLE. Press ENTER again to make the change. To set the radio to key-on-RTS mode, press ENTER, then use the up/down arrow buttons to select DISABLE. Press ENTER again to make the change.
Unit Address
2067
UNIT [10000–65000] command, Page 59
Standby Equipment
not defined
STANDBY [ON/OFF] command, Page 56
Battery Backup
not defined
BATT(ery) [ON/OFF] command, Page 59
Key On Data
enabled
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74 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Note that key-on-data mode only applies when the input data source is digital. When the input data source is analog, this setting is irrelevant.
Data Buffering Use this screen to enable or disable data buffering. If you enable data buffering, the
radio operates in seamless mode, where the data is sent over the air as quickly as possible. However, the receiver will buffer (hold) the data until enough bytes have arrived to cover worst-case gaps in transmission. This mode of operation is required for protocols such as MODBUS™ that do not allow gaps in their data transmission.
If data buffering is disabled, the radio operates with the lowest possible data latency (average). Data bytes are sent from the data port as soon as an incoming RF data frame is disassembled. Average and typical latency time will both be reduced, but idle character gaps may be introduced into the outgoing data flow.
To enable or disable data buffering, press ENTER, then use the up/down arrow buttons to display ENABLE or DISABLE. Press ENTER again to make the change.
DLINK Baudrate Use this screen to set or show the diagnostic baud rate. Allowable selections are:
2400, 4800, 9600 and 19200 bps. T o change the setting, press ENTER, then use the up/down arrow buttons to show
the desired setting. Press ENTER again to make the change. Note: This screen is associated with Network-wide Diagnostics. For more
information, refer to the
Network-wide Diagnostics manual (P/N
05-3467A01) available from GE MDS.
Diagnostic Type Use this screen to set or show the radio’s function in a network-wide diagnostics
system. The allowable settings for the radio are Node, Root, Gate, and Peer. Note: This screen is associated with Network-wide Diagnostics. For more
information, refer to the
Network-wide Diagnostics manual (P/N
05-3467A01) available from GE MDS.
Transmit Level [–20 to +3, AUTO]
Use this screen to set or display the radio’s audio transmit level when the radio is operating as an analog device with data passing through the 4-WIRE AUDIO INTERFACE. Set the audio transmit level from –20 to +3 dBm, or set it to adjust automatically.
To change the audio transmit level, press ENTER. You do not need to use the left/right arrow buttons to select a digit. Instead:
To increase the transmit level, press the up or left arrow button ( ). To decrease the transmit level, press the down or right arrow button ( ). Press ENTER again to make the change.
DATAKEY [ON/OFF] command, Page 44
Data Buffering
enabled
BUFF [ON/OFF] command, Page 42
DLINK Baudrate
4800
DLINK [ON/OFF/xxxx] command, Page 45
Diagnostic Type
Node
DTYPE [NODE/ROOT/GATE/PEER]
Transmit Level
-1 dBm
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 75
Evaluate system performance in the AUTO mode. In most cases, this setting provides satisfactory performance. If it does not, evaluate the BER at the other settings.
Receive Level [–20 to +3]
Use this screen to set or show the radio’s audio receive level when the radio is operating as an analog device.Set the audio receive level from –20 to +3 dBm.
To change the audio receive level, press ENTER. You do not need to use the left/right arrow buttons to select a digit. Instead:
To increase the receive level, press the up or left arrow button ( ). To decrease the receive level, press the down or right arrow button ( ). Press ENTER again to make the change. (Operable only on the “A”/analog model radios.)
Transmit Gain Use this screen to enable or disable the transmit audio boost for the transmit audio
level (operable only on the “A”/analog model radios).
Receive Pad Use this screen to enable or disable the receive attenuator for the receive audio
level.
Alarm Masks Use this screen to display hexadecimal codes which specify whether each alarm
event will cause:
• an alarm output relay to assert
• a radio switch-over. The screen also shows the alarm sense setting. For an explanation, or to change
the alarm masks, see the following PC commands:
Display Contrast Use this screen to set the intensity of the front panel display’s foreground
characters. Making the characters darker might aid the clarity of the front panel display when viewed from an angle.
The bar display indicates the relative intensity of the foreground characters, with 0 being faint characters and 100 being dark characters.
TXLEVEL [–20 to +3, AUTO] command, Page 59
Receive Level
-1 dBm
RXLEVEL [–20 to +3] command Page 53
Transmit Gain
disabled
TXGAIN [ON/OFF] command, Page 59
Receive Pad
disabled
RXPAD [ON/OFF] command, Page 53
Alarm Masks Major FFFF 0000 Minor 0000 FFFF
Alarm Sense is HI
AMASK [0000 0000–FFFF FFFF] command, Page 40
ASENSE [HI/LO] command,
Page 40
Display Contrast
050100
Й ЙЙЙЙЙЙ
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76 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
To change the selection, press ENTER, then use the left/right arrow buttons to move the bar display to the desired setting. The screen changes dynamically to show the effects of the change. Press ENTER again to set the change.
Backlight Intensity Use this screen to set the brightness of the front panel display’s background.
Making the screen background brighter or dimmer might aid the clarity of the front panel display when viewed under different light conditions.
The bar display indicates the relative brightness of the screen background, with 0 being dim and 100 being very bright.
To change the selection, press ENTER, then use the left/right arrow buttons to move the bar display to the desired setting. The screen changes dynamically to show the effects of the change. Press ENTER again to set the change.
Set Owner Name Use this screen to set or show text (up to 20 characters) that appears on the radio’s
start-up screen, such as the system name. Press ENTER to show a scrollable line of characters at the bottom of the screen.
Use the cursor (_) to select a character for the owner name (Figure 32). A caret (^) shows the current character position.
• Press the up arrow button to move the cursor to the left until it is under the first character of the owner name. As you scroll to the left, the character under the cursor appears above the caret.
• Press the right arrow button once to move the caret one character position to the right.
• Press the up or down arrow buttons to move the cursor to the next character.
• Continue in this way, using the up/down arrow buttons to move the cursor to a character, then pressing the right arrow button to move to the next character position.
• Press ENTER to save the owner name.
Figure 32. Setting the Owner Name and Message
Set Owner Message
Use this screen to set or show text (up to 20 characters) that appears on the radio’s start-up screen, such as the site name. See the Set Owner Name command and
Figure 32 above for instructions.
Backlight Intensity
050100
n n n n n n n n n n
Set Owner Name
^ _!”#$%&’()*+,-./0123
OWN [xxxxx] command, Page 50
Twenty-character text lin
e
Use up and down arrow buttons to move the underscore (_) lef
t
and right
Use left and right arrow buttons to move the caret (ˆ) left and right
Set Owner Message
OWM [xxxxx] command, Page 50
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 77
Set Time Use this screen to set or show the time set in the radio. The accuracy of the date
and time are important, because events are logged with the date and time. To change the time, press ENTER, then use the left/right arrow buttons to select
the hour, minute, second, or AM/PM. Then use the up/down arrow buttons to increase or decrease the digit, or toggle between AM and PM. Repeat for other characters if necessary. Press ENTER again to make the change.
Set Date Use this screen to set or show the date set in the radio. The accuracy of the date
and time are important because events are logged with the date and time. To change the date, press ENTER, then use the left/right arrow buttons to select
the month, day, or year. T hen use the up/down arrow buttons to increase or decrease the day or year, or set the month. Repeat for other characters if necessary. Press ENTER again to make the change.
GROUP 3—DIAGNOSTICS Operating Status This screen displays three key operating conditions of the radio: TX key status,
Received Signal Strength Indication (RSSI), and Signal-to-Noise (S/N) ratio. Unlike other screens, the information shown on the Operating Status screen is preserved across power outages and radio switchovers. This screen has no timeout and will show until changed by an operator.
Active Radio Status
Use this screen to show alarm conditions, if any. Major and minor alarm events are listed in Tab le 13 on Page 57.
If there have been alarm events, press ENTER to show the first alarm. To scroll through the list of alarms, press the right or down arrow button. Pressing ESCAPE returns the radio to the Active Radio Status screen.
Receive Signal Strength
This screen displays the received signal strength in dBm. In a typical master station configuration, the received signal strength is read from
each remote radio that transmits to the master station.
Set Time
12:04:03 AM
May 01 1999
TIME [hh:mm:ss] command, Page 57
Set Date
12:04:03 AM
May 01 1999
DATE [mmm dd yyyy] command, Page 44
Operating Status
TX: dekeyed
RSSI: -60 dBm
S/N 10 dB
Active Radio Status
Alarms present
(enter for details)
Event: 20 (MINOR)
Configuration error
STAT command, Page56
Rx Signal Strength
-120 dBm
RSSI, RSSI! command, Page 52
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78 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
S/N Ratio This screen shows the current signal-to-noise ratio in dBm.
Radio Selection Use this screen to set or show the transceiver board selection. When you select
AUTO, automatic switchover is enabled. If the master station detects a major alarm
and a redundant radio is operational, control automatically switches to the alternate radio. Use the AUTO setting even if there is only one transceiver board installed. This allows you to easily upgrade the master station at a future date by simply inserting another transceiver board.
The third line on the display shows which radio transceiver board is currently active.
A selection of A or B forces the active transceiver board to the A or B transceiver board, and disables standby redundancy. These settings should rarely be used; they are provided mainly for diagnostic test purposes.
T o change the radio selection setting, press the ENTER key , then use the up/down arrow buttons to select AUTO, A or B. Press ENTER again to make the change.
Transmitter Status This screen shows the transmitter state. Keyed means the transmitter is set to
transmit; dekeyed means the transmitter cannot transmit. Configure the transmitter to keyed or dekeyed by selecting Manual Key from the Configuration menu (Page 72). Use this setting when working on the radio, and the radio must be keyed to evaluate transmitter output power.
Show Temperature and Voltages
This screen shows the radio’s internal temperature and voltages. The input voltage is the voltage that connects to the transceiver board and is unregulated. This voltage is the output from the power supply assembly. The output voltage is read after the10 Vdc regulator on the transceiver board.
Serial Number This screen shows the se rial numbers of the transceiver boards. These numbers
will not match the serial number on the radio’s serial number label. If the radio is not equipped with a second transceiver board, one of the lines reads NOT
EQUIPPED.
Software Revision This screen shows the internal software part number and version number.
S/N Ratio
SNR, SNR! command, Page 5
5
Radio Selection
AUTO
Radio A is active
RADIO [AUTO/A/B] command, Page 51
Transmitter Status
keyed
Show
Temp/Voltage
37 Celsius
11.2 Volts Input
5.8 Volts Output
TEMP command, Page 57
Serial Number
A: 00755959
SER command, Page 54
Software Revision
06-3321A02
0.0.0 5Aug1998
SREV command, Page 55
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 79
GROUP 4—EVENT LOG Event Log This screen shows the events logged on the active transceiver board. In many
cases, you can review the events leading up to a failure to help determine the cause of a problem. The event log number, date and time of the event, and a description of the event are shown.
Press ENTER to review the event log. The most recent log is shown first. Use the up/down arrow buttons to scroll through the stored history of events.
Clear Logs Use this screen to erase all events from the event log.
7.0 LOCAL & NETWORK-WIDE PROBLEM SOLVING
Most radio system problems are due to the failure of components outside of the transceiver—such as a poor or broken feedline or antenna connec­tion. This section will help you determine whether the problem is out­side or inside the radio and, if in the radio, how to restore operation as quickly as possible.
GE MDS does not recommend component-level repairs in the field. However, you can replace the radio’s major assemblies without using tools or test equipment. Section 8.0, REPLACING ASSEMBLIES,
beginning on Page 86 covers this in detail.
If you cannot solve a system problem with the information provided here, technical assistance is also available from the factory. Refer to the inside back cover of this guide for contact information.
NOTE: Before starting any detailed troubleshooting, check the basic
requirements at both ends of the link: primary power, secure cable connections, and proper antenna heading. In many cases, one of these cause poor operation or a complete loss of link service.
Log 1 of 1
5/ 1/1998 12:00;00
System Boot
LOG [CLR] command, Page 4
8
Clear Logs
Are you sure?
No
LOG [CLR] command, Page 4
8
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80 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
7.1 Local Problem-Solving
Front Panel LEDs
The first indication of a problem is usually an illuminated ALARM LED on the front panel. In normal operation, only the green (ACTIVE) LED is lit (and, in a master station configured for redundant operation, one of the yellow STBY LEDs).
In a redundant master station, the LEDs show the state of the A and B transceiver boards. In a non-redundant master station, the LEDs show the state of the A transceiver board.
Refer to Figure 33 and the text that follows for an explanation of the LED indicators.
Invisible place holder
Figure 33. LED Indicators
Table 19. Explanation of Front Panel LEDs
LED Name
Color Meaning When Lit
ACTIVE
Green Transceiver board (A or B) is the selected unit.
STBY
Yellow Transceiver board (A or B) is currently in stand-by mode
(functional on master station configured for redundant operation only).
ALARM
Red A major or minor alarm event has occurred. Use the front
panel’s Active Radio Status screen to list current alarm events (see Page 77).
RX ALR
Red Difficulty receiving, possibly due to an antenna problem,
receiver fault, or other condition causing no or a weak received signal level.
TX ALR
Red Transmit circuitry fault.
I/O ALR
Red A data framing or parity error has occurred over the data
port.
A
B
ACTIVE STBY ALARM RX ALR TX ALR I/O ALR
ACTIVE STBY ALARM RX ALR TX ALR I/O ALR
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 81
Chassis-Mounted LEDs
On current production radios, a series of additional LEDs are located behind the front panel on the chassis. These indicators are primarily for use in troubleshooting the radio and show important details about the status of the radio circuitry.
To view the chassis LEDs, remove the front panel by grasping it along the bottom edge and pulling straight out (see Figure 34).
Invisible place holder
Figure 34. Front Panel Removal
Refer to Figure 35 and the text that follows for an explanation of the LED functions.
Invisible place holder
Figure 35. Chassis-Mounted LEDs (Front Panel Removed)
A
PWR
MJR ALM
MNR ALM
RTS
CTS
TXD
DCD
RXD
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Problem Solving Using a Connected PC
You can determine radio status with a PC connected to the master sta­tion. Useful commands for performing diagnostics are listed in Table 8
on Page 35. For instructions on performing diagnostics using a con-
nected PC, see “Performing Network-Wide Radio Diagnostics” on Page
84.
Problem Solving Using the Front Panel Display
The radio includes several useful tools in the
Diagnostics and Event Log
menus that you can use to identify system problems. Brief descriptions of Event Log commands are given below. Other commands useful for performing diagnostics are listed in Table 16 on Page 67. Refer to Sec-
tion 6.5, Screen Descriptions, for detailed information about these com-
mands.
Event Log Use the Event Log to identify system problems. The radio stores recent
events, such as turning the primary power on, in a log that you can review using the
Event Log screen (for a full description, see “Event Log”
on Page 79). In many cases, you can review the events leading up to a
failure to determine the cause of a problem. Event log messages are also helpful when calling GE MDS for technical assistance.
Table 20. Explanation of Chassis-Mounted LEDs
LED Name Meaning When Lit
PWR Power is applied to the radio. MJR ALM Major Alarm—Indicates a hardware failure or other abnormal
condition that prevents (or seriously hampers) further operation of the radio. Factory service might be required.
MNR ALM Minor Alarm—Indicates a condition which, under most
circumstances, will not prevent radio operation. This includes out-of-tolerance conditions, baud rate mismatches, and so on. Investigate the cause to prevent system failure.
RTS Request to Send—A logic hi gh is present on Pin 4 of the DATA
INTERFACE connector. The transmitter is keyed.
CTS Clear-to-Send—The programmed CTS delay time has elapsed
and a logic high is present on Pin 5 of the DATA INTERFACE connector.
TXD Transmit Data—The radio is receiving data at Pin 2 of the DATA
INTERFACE connector.
DCD Data Carrier Detect—The radio is receiving valid data frames from
another station (over the air). Pin 8 of the DATA INTERFACE connector is at a logic high.
RXD Receive Data—The radio is outputting data at Pin 3 of the DATA
INTERFACE connector.
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 83
• Major alarms generally indicate a hardware
failure or other abnormal condition that prevents (or hampers) further operation of the radio link. Most major alarms trigger a switch-over of internal transceiver board assemblies on a master station configured for redundant operation.
• Connections to a relay that actuates with these alarms are pro­vided on the rear panel ALARM connector (see Figure 23 on
Page 25).
• Minor alarms generally will not prevent operation of the radio link, but may impair performance. This includes out-of-toler­ance conditions, low signal-to-noise ratios, and so on. Investi­gate the cause of a minor alarm and correct it to prevent an eventual system failure.
• Connections to a relay that actuates with these alarms are pro­vided on the rear panel ALARM connector (see Figure 23 on
Page 25).
System Bench Testing Set-up
Figure 36 on Page 84 shows a sample test setup that you can use to
verify the basic operation of master and remote radios. You can perform this test with any number of remote radios by using a power divider with the appropriate number of output connections.
MDS x710A and x790A radios include an internal RTU simulator. Use the RTU command (see “RTU [ON/OFF/0-80]” on Page 52) to poll remote radios. The command reports the number of polls sent, polls received, and the number of errors detected. For more information on polling with the RTU simulator, refer to Publication 05-3467A01.
It is very important to use attenuation between all units in the test setup. The amount of attenuation required depends on the number of units being tested and the desired signal strength (RSSI) at each transceiver during the test. In no case should a signal stronger than –50 dBm be applied to any radio in the test setup.
CAUTION
POSSIBLE
EQUIPMENT
DAMAGE
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84 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Figure 36. System Bench Test Set-up
7.2 Performing Network-Wide Radio Diagnostics
You can remotely poll radios in a network by connecting a laptop or PC running MDS InSite diagnostics software to any radio in the network.
Figure 36 shows an example of a setup for performing network-wide
remote diagnostics. If a PC is connected to any radio in the network, you can perform active
messaging (polling which briefly interrupts payload data transmission). To perform diagnostics without interrupting payload data transmission, connect the PC to a radio defined as the “root” radio. You can make a radio the root radio by using the DTYPE ROOT command (Page 46) locally, at the radio.
For more information, see the InSite Radio System Management Soft- ware User’s Guide. You can find a complete explanation of remote diagnostics in the GE MDS Network-wide Diagnostics Handbook (P/N 05-3467A01). Refer to the handbook for more information about the basic diagnostic procedures outlined below.
1. Program one radio in the network as the root radio by entering the
DTYPE ROOT command at the radio.
2. At the root radio, use the DLINK ON and DLINK [baud rate] commands to enable network-wide diagnostics and set the baud rate at the
DIAGNOSTICS port.
3. Program all other radios in the network as nodes by entering the
DTYPE NODE command at each radio.
REMOTE
REMOTE
REMOTE
REMOTE
POWER ATTENUATORS
• Fixed or adjustable
POWER DIVIDER
NON-RADIATING ATTENUATOR
• Install on any unused divider ports
COMPUTER RUNNING
MDS "POLL.EXE" PROGRAM
MASTER STATION
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 85
4. Use the DLINK ON and DLINK [baud rate] commands to enable network-wide diagnostics and set the baud rate at the DIAG-
NOSTICS
port of each node radio.
5. Connect same-site radios using a null-modem cable at the radios’
DIAGNOSTICS ports.
6. Connect a PC on which MDS InSite software is installed to the root radio, or to one of the nodes, at the radio’s DIAGNOSTICS port (this PC can be the PC that collects payload data, as shown in Figure 37). To connect a PC to the radio’s DIAGNOSTICS port, an RJ-11 to DB-9 adapter (MDS P/N 03-3246A01) is required. If desired, you can construct an adapter cable from scratch using the information shown in Figure 38 on Page 86.
7. Launch the MDS InSite software at the PC. See the InSite Radio System Management Software User’s Guide for instructions.
Invisible place holder
Figure 37. Network-Wide Remote Diagnostics Setup
RTU
RTU
TO
DIAGNOSTICS
PORT
TO DATA
PORT
MASTER STATION
ROOT
DTYPE
ROOT
DIAGNOSTICS DATA
(TO InSite)
HOST COMPUTER
PAYLOAD DATA
RTU
(TO SCADA APPLICATION)
DTYPE
NODE
DTYPE
NODE
DTYPE
NODE
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86 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
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Figure 38. RJ-11 to DB-9 Adapter Cable
8.0 REPLACING ASSEMBLIES
GE MDS does not recommend component-level repair of a transceiver board in the field due to the complex nature of the circuitry and the use of surface-mount technology throughout the radio. You should return malfunctioning assemblies to the factory (or authorized service center) for repair or replacement.
One approach to field-level servicing is to have spare modules available for the four easily replaced assemblies—the Main Transceiver Board, Power Supply, Front Panel, and Internal Duplexer. In this way, you can quickly remove and replace a defective assembly with a working assembly. The following instructions describe the removal and installa­tion of these assemblies.
Disconnect primary power to the radio before removing or installing transceiver board or power supply assemblies.
8.1 Transceiver Board and Power Supply
Assemblies
To remove either of these assemblies, loosen the two captive thumb­screws at each side of the module, then slide the module straight out as shown in Figure 39 on Page 87. There are no cables to disconnect, as the modules are fitted with in-line connectors.
To replace the AC Power Supply Module’s fuse, use 5x20mm Glass
3.15A 250V fuse (GE MDS P/N 29-2130A06).
To re-install these modules, make sure that the slides are properly aligned with the guide slots on the chassis, then push straight in. Tighten the thumbscrews to secure the assembly.
RXD TXD GND
2 3 5
DB-9 FEMALE
(TO COMPUTER
)
TXD RXD GND
4 5 6
RJ-11 PLUG
(TO RADIO)
RJ-11 PIN LAYOUT
1
6
CAUTION
POSSIBLE
EQUIPMENT
DAMAGE
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 87
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Figure 39. Main Transceiver and Power Supply Removal
8.2 Installation & Removal of Backup Battery
(P/N 28-1575Axx)
To install the backup battery, follow these steps:
1. Make sure AC power is removed and the BATTERY BACKUP switch is set to OFF (see Figure 11 on Page 16).
2. Remove the 4 Phillips screws on each side of the chassis and remove the top cover of the radio.
When handling the backup battery, be careful not to short the terminals on the radio chassis. Doing so can cause damage to the battery and cause personal injury.
3. Place the battery in the chassis in the area provided (see Figure 40
on Page 88) and secure the battery clamp over the battery. The bat-
tery should be a minimum rating of 4.5 Ah.
POWER SUPPLY
MAIN TRANSCEIVE
R
BOARD
DANGER
PERSONAL
INJURY
HAZARD
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88 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
4. Locate the battery cable and connect it to the proper terminals on the battery . The red wire connects to the positive (+) terminal; the black wire connects to the negative (–) terminal.
Figure 40. Backup Battery Installation
5. Reinstall the top cover of the radio and set the BATTERY BACKUP switch to ON. If the battery is charged, the radio should begin oper­ating immediately. If it is not charged, you must operate the radio from an AC power for at least 6 hours before battery backup is available.
6. This completes the installation of the backup battery. To remove the battery from the radio, reverse these steps.
8.3 Front Panel
The front panel is secured to the chassis with spring-loaded latches. To remove the panel, simply pull out at the bottom edge until it is free from the chassis (Figure 41 on Page 89). You must also disconnect the mod­ular cable from the back of the panel. Reverse these steps to re-install the front panel on the chassis.
(P/N 28-1575Axx)
Backup Battery
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 89
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Figure 41. Front Panel Removal/Replacement
8.4 Operating Frequency Change Considerations
Changing the radio’s operating frequency through a terminal command or using the front panel is an easy process. However, there are fre­quency-sensitive components within the radio that could impact opera­tion on the new frequency—the receiver front-end helical coils and an internal duplexer, if one is present. These elements have resonant cir­cuits that prevent the transmitter from damaging the radio’s receiver and interfering with other radios operating on nearby channels. The circuits also attenuate out-of-band signals that could interfere with receiver operation.
Changes in transmit operating frequency of granter than 100 kHz from the factory settings will require retuning of the duplexer. Likewise, changes in receive operating frequency greater than 5 MHz will require retuning of the duplexer and/or the receiver’s front-end helical circuits (see “MDS 4790/970—Front End Helical Coil Alignment” on Page 91). Retuning of these circuits provides operation with maximum receiver sensitivity and protection from damage to the radio’s receiver from the transmitter’s RF output.
The feasibility of large changes in frequency depend on the type of duplexer installed in the radio, or if there is an antenna switch module present.
A
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90 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
MDS 4790—400 MHz Notch-Type Duplexers
You can change the radio’s transmit frequency up to 100 kHz without re-tuning the duplexer. The duplexers shown in Figure 42 can be aligned in the field by experienced technicians using high-quality test equip­ment. For assistance, contact GE MDS Technical Support for additional details about tuning.
Figure 42. 400 MHz Notch Duplexer
(No adjustment needed for transmit changes up to 100 kHz)
Duplexer alignment is a sophisticated procedure and a duplexer can be easily damaged if not handled carefully. It is highly-recommended that you return duplexers needing re-alignment to GE MDS, or the original duplexer manufac­turer, for alignment. In some cases, it may be more economical to replace the unit than to have it re-aligned.
MDS 9790—Bandpass-Type Duplexers
These duplexers (Figure 43) typically allow the transmitter frequency to change up to 500 kHz without undesired results. Since this type of duplexer cannot be re-aligned in the field, we recommend contacting the GE MDS Technical Support Department if you suspect a duplexer problem or need one for a different frequency.
Figure 43. 900 MHz Bandpass Duplexer
(No adjustment needed for transmit changes up to 500 kHz)
CAUTION
POSSIBLE
EQUIPMENT
DAMAGE
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MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 91
MDS 4790/9790 Simplex Radios—With Antenna Switch Modules
Simplex radios do not have a duplexers. In its place, an Antenna Switch Module is placed to switch the antenna system between the radio’s transmitter and receiver. The switch does not have any frequency-sensi­tive elements and covers the radio’s entire operating band. You can pro­gram radios equipped with this module to any frequency within their operating range. However, two things must be considered:
1. The antenna system’s performance might not be satisfactory on the new frequency. You can quickly check this by measuring the antenna system’s standing-wave-ratio (SWR) for a ratio of 1.5:1 or less at the antenna.
2. The receiver’s front-end helical coils will need retuning if the change in receive frequency is more than 5 MHz.
Figure 44. Antenna Switch Module
MDS 4790/970—Front End Helical Coil Alignment
Changing the radio’s receive frequency by more than 5 MHz requires re-alignment of the receiver’s front-end helical coil set. Significant deg­radation in receive bit-error rate (BER) is likely if the coils are not aligned properly. For assistance, contact GE MDS Technical Support for details about the tuning procedure.
8.5 Testing and Removing an Internal Duplexer
Testing
If you suspect that the internal duplexer is not functioning properly, per­form the following steps to determine if requires replacement:
1. Measure the RF power out of the antenna jack. If the power registers approximately +37 dBm (5 watts), the internal
duplexer is probably functioning correctly (see Table 21 on Page 103 for dBm-volts-watts conversion chart).
If the power registers significantly less than +37 dBm, proceed with Step 2 .
2. Open the radio chassis, locate the TX cable, and disconnect the cable from vertical interface board (Figure 45 on Page 92).
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92 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
3. Using an adapter, connect the RF power meter to the SMA connec­tor on the vertical interface board, key the radio and measure the RF power.
• If the power registers +39 dBm, the radio board is functioning correctly.
• If the power registers less than +39 dBm, proceed with Step 4.
4. Use the front panel to switch to the alternate transmitter and again measure the RF power output.
• If the alternate transmitter registers +39 dBm, the internal duplexer probably needs replacing.
5. Before replacing the duplexer, verify that the highest or lowest fre­quencies marked on the duplexer are the same as radio’s transmit and receive frequencies or within the nominal operating range: 100 kHz for 400 MHz radios, and 500 kHz for 900 MHz radios.
Removing the Internal Duplexer
To remove the internal duplexer, follow these steps:
1. Disconnect the cables from the back of the duplexer (see Figure 45).
Figure 45. Internal Duplexer Cabling
NOTE: A number of different duplexers can be installed in the radio.
While the physical appearance of the duplexer may vary slightly, its operation and removal remain the same.
2. Remove the four screws that secure the duplexer to the chassis as shown in Figure 46 on Page 93.
3. Carefully lift the duplexer out of the chassis.
Duplexer Assy.
TX (Transmit) Cable
Antennna Cable
RX (Receive) Cable
Vertical Interface
Board
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