MDS SD2, SD4, SD9 Reference Manual
MDS SD Series
Secure, Long Range Data Communications
Reference Manual
Covering Units Operating in x710 Mode
with Firmware Version 4.x
MDS 05-4670A01, Rev. E
MARCH 2015
Installation and Operation Guide
Need Quick-Start instructions for this product? Please refer to publication 05-4669A01.
All GE MDS user guides are available online at www.gemds.com
TABLE OF CONTENTS
RF Safety Notice (English and French) .......................................................................................... iv
FCC Part 15 Notice ......................................................................................................................... iv
Industry Canada Notice .................................................................................................................. iv
1.0 INTRODUCTION .................................................................................................................. 1
1.1 Conventions Used in This Manual .................................................................................................1
1.2 Electronic Manuals ........................................................................................................................ 2
2.0 PRODUCT DESCRIPTION................................................................................................... 3
2.1 Front Panel Connectors and Indicators ......................................................................................... 3
2.2 Key Product Features .................................................................................................................... 4
2.3 Model Offerings ............................................................................................................................. 4
2.4 Operating Modes and Applicable Manuals ....................................................................................5
2.5 Accessories and Spares ................................................................................................................ 6
3.0 APPLICATIONS .................................................................................................................... 6
Point-to-Multipoint, Multiple Address Systems (MAS) ..................................................................... 6
Point-to-Point System ......................................................................................................................7
Continuously-Keyed versus Switched-Carrier Operation................................................................. 8
Single-Frequency (Simplex) Operation............................................................................................ 8
4.0 INSTALLATION PLANNING ................................................................................................. 8
4.1 Typical Installation ......................................................................................................................... 8
4.2 Mounting Options .......................................................................................................................... 9
Optional DIN Rail Mounting ........................................................................................................... 10
4.3 Antennas and Feedlines .............................................................................................................. 11
Feedlines ....................................................................................................................................... 11
4.4 DC Power Connection ................................................................................................................. 12
4.5 Grounding Considerations ........................................................................................................... 13
4.6 COM1 (Management) Connections .............................................................................................13
COM1 in Analog Operation ............................................................................................................14
4.7 COM2 (Data) Connections .......................................................................................................... 15
4.8 Ethernet Interface (RJ-45) ........................................................................................................... 17
5.0 STEP-BY-STEP INSTALLATION ........................................................................................ 18
5.1 Initial Startup & Checkout ............................................................................................................ 19
5.2 Initial Software Configuration .......................................................................................................19
Serial vs. Telnet Access, and the Device Manager........................................................................ 20
Connecting a PC & Setting Basic Parameters...............................................................................20
6.0 TRANSCEIVER MANAGEMENT........................................................................................ 21
6.1 Software Commands ................................................................................................................... 21
MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) i
Entering Commands ......................................................................................................................21
6.2 Detailed Command Descriptions ................................................................................................. 24
AK .................................................................................................................................................. 25
ALARM........................................................................................................................................... 25
AMASK [0000 0000–FFFF FFFF]..................................................................................................25
ASENSE [HI, LO] ........................................................................................................................... 25
AUDIO [ON, OFF] .......................................................................................................................... 26
BAUD [xxxxx abc] ..........................................................................................................................26
BIN [DATA, CLEAR]....................................................................................................................... 26
BOOT.............................................................................................................................................26
BUFF [ON, OFF] ............................................................................................................................ 26
CKEY [ON–OFF]............................................................................................................................ 27
CTS [0–255]...................................................................................................................................27
CTSHOLD [0–60000] .....................................................................................................................27
DATAKEY [ON, OFF] ..................................................................................................................... 28
DEV................................................................................................................................................ 28
DEVICE [DCE, CTS KEY].............................................................................................................. 28
DKEY ............................................................................................................................................. 28
DLINK [ON/OFF/xxxx].................................................................................................................... 28
DTYPE [NODE/ROOT] ..................................................................................................................29
DUMP ............................................................................................................................................ 29
EMP [ON/OFF]............................................................................................................................... 29
ETHADDR...................................................................................................................................... 29
FORCEALARM [ON or OFF] .........................................................................................................29
FORCEDCD [ON or OFF] ..............................................................................................................29
HELP.............................................................................................................................................. 29
INIT ................................................................................................................................................ 30
INIT [SDx] ...................................................................................................................................... 30
INIT [P-20]...................................................................................................................................... 30
IPCONFIG...................................................................................................................................... 31
KEY................................................................................................................................................31
MENU ............................................................................................................................................ 31
MODEL1 ........................................................................................................................................ 31
MODEL2 ........................................................................................................................................ 31
MODEM [xxxx] ............................................................................................................................... 31
OWM [XXX...]................................................................................................................................. 33
OWN [XXX...] ................................................................................................................................. 33
PORT [RS232, RS485] .................................................................................................................. 34
PTT [0–255] ...................................................................................................................................34
PTTSIG [OFF, LOW, HI].................................................................................................................34
PWR [20–37].................................................................................................................................. 34
RESTORECONFIG........................................................................................................................ 34
RESTOREDEFAULTS ................................................................................................................... 34
RMODE [X710, TRANSPARENT, PACKET, CMAC, HELP] ..........................................................34
RSSI............................................................................................................................................... 34
RTSKEY [ON, OFF] ....................................................................................................................... 35
RTU [ON/OFF/0-80] .......................................................................................................................35
RX [xxx.xxxx] ................................................................................................................................. 35
RXATTN [ON or OFF] ....................................................................................................................35
RXLEVEL [–20 to 0] .......................................................................................................................35
RXTOL [NORMAL or CUSTOM] ....................................................................................................36
MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) ii
RXTOT [NONE, 1-1440] ................................................................................................................36
SAVECONFIG................................................................................................................................ 36
SCD [0-255] ...................................................................................................................................36
SER................................................................................................................................................ 36
SHOW [DC, PWR] .........................................................................................................................36
SNR ............................................................................................................................................... 36
SPECTRUM [xxx.xx] ......................................................................................................................37
SQUELCH [AUTO, BYPASSED]....................................................................................................37
SREV ............................................................................................................................................. 37
STAT ..............................................................................................................................................38
SWC [ON, OFF] ............................................................................................................................. 38
TFTP .............................................................................................................................................. 38
TEMP ............................................................................................................................................. 38
TOT [1-255, ON, OFF] ...................................................................................................................39
TX [xxx.xxxx]..................................................................................................................................39
TXLEVEL [–20 to 0, AUTO] ...........................................................................................................39
UNIT [10000...65000]..................................................................................................................... 39
UPTIME ......................................................................................................................................... 39
VERSION.......................................................................................................................................39
7.0 TROUBLESHOOTING........................................................................................................ 40
7.1 LED Indicators ............................................................................................................................. 40
7.2 Event Codes ................................................................................................................................ 40
Checking for Alarms—STAT command..........................................................................................40
Major Alarms vs. Minor Alarms ......................................................................................................41
Event Code Definitions .................................................................................................................. 41
8.0 TECHNICAL REFERENCE ................................................................................................ 43
8.1 Technical Specifications ............................................................................................................. 43
8.2 Performing Network-Wide Remote Diagnostics .......................................................................... 45
8.3 User-Programmable I/O Functions - Pending ............................................................................. 46
8.4 Analog Operation of the Transceiver ........................................................................................... 46
Physical Interface........................................................................................................................... 47
Operational Characteristics............................................................................................................ 47
8.5 Upgrading the Radio’s Firmware ................................................................................................. 48
Web Method................................................................................................................................... 49
TFTP Method ................................................................................................................................. 50
Serial Transfer Method................................................................................................................... 52
Error Messages During File Transfers ...........................................................................................54
8.6 dBm-Watts-Volts Conversion Chart .............................................................................................55
9.0 GLOSSARY OF TERMS..................................................................................................... 56
Copyright and Trademark
This manual and all software described herein is protected by Copyright: 2012 GE MDS, LLC. All
rights reserved. GE MDS, LLC reserves its right to correct any errors and omissions in this publication. Modbus® is a registered trademark of Schneider Electric Corporation. All other trademarks
and product names are the property of their respective owners.
MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) iii
RF Safety Notice
RF Exposure
l'exposition aux RF
Concentrated energy from a directional antenna may pose a health hazard to
humans. Do not allow people to come closer to the antenna than the distances
listed in the table below when the transmitter is operating. More information on
RF exposure can be found online at the following web site:
www.fcc.gov/oet/info/documents/bulletins.
Concentré d'énergie à partir d'une antenne directionnelle peut poser un risque
pour la santé humaine. Ne pas permettre aux gens de se rapprocher de l'antenne
que les distances indiquées dans le tableau ci-dessous lorsque l'émetteur est en
marche. Plus d'informations sur l'exposition aux RF peut être trouvé en ligne à
l'adresse suivante: www.fcc.gov/oet/info/documents et bulletins.
Antenna Gain vs. Minimum RF Safety Distance
Safety Distance (SD4) 0.93 meter 1.66 meters 3.51 meters
Safety Distance (SD9) 0.72 meter 1.28 meters 2.71 meters
Safety Distance (SD1)
Safety Distance (SD2)
Safety Distance
(Other SD models):
(English and French)
Antenna Gain
0–5 dBi 5–10 dBi 10–16.5 dBi
For SD1, maintain an RF safety distance of
2.02 meters for a 7 dBd (9.15 dBi) antenna.
Use of higher gain antennas means
increasing the distance accordingly.
For SD2, maintain an RF safety distance of
1.89 meters for a 7 dBd (9.15 dBi) antenna.
Use of higher gain antennas means
increasing the distance accordingly.
Consult factory prior to operation.
FCC Part 15 Notice
Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may
cause undesired operation. Any unauthorized modification or changes to this device without the
express approval of the manufacturer may void the user’s authority to operate this device. Furthermore, this device is intended to be used only when installed in accordance with the instructions outlined in this manual. Failure to comply with these instructions may void the user’s authority to
operate this device.
Industry Canada Notice
This Class A digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.
iv SD Series Reference Manual (x710 Mode) MDS 05-4670A01, Rev. E
Servicing Precautions
When servicing energized equipment, be sure to wear appropriate Personal Protective Equipment
(PPE). During internal service, situations could arise where objects accidentally contact or short
circuit components and the appropriate PPE would alleviate or decrease the severity of potential
injury. When servicing radios, all workplace regulations and other applicable standards for live
electrical work should be followed to ensure personal safety.
Manual Revision and Accuracy
This manual was prepared to cover a specific version of firmware code. Accordingly, some screens
and features may differ from the actual unit you are working with. While every reasonable effort
has been made to ensure the accuracy of this publication, product improvements may also 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 GE MDS using the information at
the back of this guide. In addition, manual updates can be found on our web site at
www.gemds.com
Environmental Information
The manufacture of this equipment has required the extraction and use of natural resources.
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 limit 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.
Battery Disposal
may not be disposed of as unsorted municipal waste in the European Union. See the product documentation for specific battery information. Batteries are marked with a symbol, which may
include lettering to indicate cadmium (Cd), lead (Pb), or mercury (Hg). For proper recycling return
the battery to your supplier or to a designated collection point. For more information see:
www.weeerohsinfo.com.
—This product may contain a battery. Batteries must be disposed of properly, and
Product Test Data Sheets
Test Data Sheets showing the original factory test results for this unit are available upon request
from the GE MDS Quality Leader. Contact the factory using the information at the back of this
manual. Serial numbers must be provided for each product where a Test Data Sheet is required.
CSA/us Notice
This product is approved for use in Class 1, Division 2, Groups A, B, C & D Hazardous Locations.
Such locations are defined in Article 500 of the National Fire Protection Association (NFPA) publication NFPA 70, otherwise known as the National Electrical Code. The transceiver has been recognized for use in these hazardous locations by the Canadian Standards Association (CSA) which
also issues the US mark of approval (CSA/US). The CSA Certification is in accordance with CSA
STD C22.2 No. 213-M1987.
MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) v
CSA Conditions of Approval: The transceiver is not acceptable as a stand-alone unit for use in the
EXPLOSION
HAZARD!
hazardous locations described above. It must either be mounted within another piece of equipment
which is certified for hazardous locations, or installed within guidelines, or conditions of approval,
as set forth by the approving agencies. These conditions of approval are as follows: The transceiver
must be mounted within a separate enclosure which is suitable for the intended application.The
antenna feedline, DC power cable and interface cable must be routed through conduit in accordance with the National Electrical Code. Installation, operation and maintenance of the transceiver
should be in accordance with the transceiver's installation manual, and the National Electrical
Code. Tampering or replacement with non-factory components may adversely affect the safe use
of the transceiver in hazardous locations, and may void the approval. A power connector with
screw-type retaining screws as supplied by GE MDS must be used.
Do not disconnect equipment unless power has been switched off or the area is known to
be non-hazardous. Refer to Articles 500 through 502 of the National Electrical Code
(NFPA 70) for further information on hazardous locations and approved Division 2 wiring
methods.
BSD License Information
The SD Series products contain source code originally released as part of “WPA Supplicant” which
is copyrighted as indicated below and is redistributed under the terms of the BSD license:
WPA Supplicant
Copyright (c) 2003-2010, Jouni Malinen <j@w1.fi> and contributors
All Rights Reserved.
BSD License
-------
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of conditions and
the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions
and the following disclaimer in the documentation and/or other materials provided with the distribution.
3. Neither the name(s) of the above-listed copyright holder(s) nor the names of its contributors may
be used to endorse or promote products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
“AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
vi SD Series Reference Manual (x710 Mode) MDS 05-4670A01, Rev. E
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) vii
viii SD Series Reference Manual (x710 Mode) MDS 05-4670A01, Rev. E
1.0 INTRODUCTION
This Reference Manual is one of two books provided for users of the
MDS SD Series Transceiver (Figure 1) operating in x710 Mode. It contains an overview of common applications, installation planning data,
technical specifications, troubleshooting, and a listing of software commands. This manual should be available to technical personnel who perform network design, configuration, and troubleshooting of the
equipment.
A companion Instruction Sheet is also available (Part no. 05-4669A01).
The scope of the Instruction Sheet is limited to installing the transceiver
and placing it in service for the first time.
Invisible place holder
Software Notations
Model Number Notations
Authorization Features
Figure 1. MDS SD Series Transceiver
1.1 Conventions Used in This Manual
This product is designed for software control using a connected PC. To
indicate the names of software commands, keyboard entries, or other
information shown on a PC screen, a distinctive, bolded font is used as
follows:
Bolded font example (used for software commands and keyboard entries)
The term “SD” or “SD Series” is used in this manual to denote all
models in the SD product line. Specific model numbers such as “MDS
SD2” (216-235 MHz) “MDS SD4” (350-512 MHz) and MDS SD9
(928-960 MHz) are used only when necessary to reference model-specific features. This manual applies to all SD radios operating in x710
Mode.
Some features of the radio are dependent on purchased options and
applicable regulatory constraints. A “key” icon is shown near the
heading of these features in this manual. If your radio is not currently
authorized for a needed feature, contact your factory representative for
information on obtaining a new authorization code/key.
MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) 1
1.2 Electronic Manuals
All SD Series manuals are available in printed or electronic form.
Download electronic manuals from our web site at www.gemds.com.
The web site also contains links to Application Bulletins and other
product information.
2 SD Series Reference Manual (x710 Mode) MDS 05-4670A01, Rev. E
2.0 PRODUCT DESCRIPTION
ANTENNA
CONNECTOR (TNC)
SERIAL DATA
CONNECTORS (DB-9)
DC INPUT
POWER
LED INDICATOR
PANEL
ETHERNET
CONNECTOR (RJ-45)
COM1 used for radio management
The SD Transceiver is a software-configurable, industrial radio for use
in licensed data acquisition networks. It can be interfaced with a variety
of data control equipment including remote terminal units (RTUs), programmable logic controllers (PLCs), flow computers, and similar
devices. Data interface connections can be made for both serial
(RS-232/RS-485) and local Ethernet protocols.
The radio’s x710 Mode is designed primarily for use in serial MDS x710
radio networks where a central station communicates with each remote,
one at a time, to convey data and control signals. For models operating
in this mode, the radio offers direct, drop-in compatibility with existing,
older x710 networks while providing additional functionality not found
in MDS x710 radios. An SD Transceiver in x710 mode looks like an
x710 with respect to over-the-air transmission and all serial user interface commands (plus some new SD-specific commands).
The transceiver employs digital signal processing (DSP) technology and
a fully digital transmit and receive IF chain to provide robust communications even under adverse conditions. Digital signal processing also
helps eliminate the effects of component variations or temperature
swings, resulting in an optimized performance.
2.1 Front Panel Connectors and Indicators
Figure 2 shows the transceiver’s front panel connectors and indicators.
These items are referenced in various locations in this manual. The
transceiver’s LED functions are described in Table 10 on Page 19.
Invisible place holder
MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) 3
Figure 2. Front Panel Connectors & Indicators
2.2 Key Product Features
The transceiver is designed to meet the demanding needs of today’s
industrial wireless networks in a compact, rugged package. It offers an
array of features in one hardware platform:
• Ethernet & serial interfaces—ideal for migration to IP networks
• Dual serial functionality (RS-232 and RS-485)
• Software configurable using the built-in interface, and Web management—no manual controls or adjustments. Supports Serial,
Telnet, or web-based management.
• Over-the-air reprogramming—no unnecessary trips to radio sites
• Licensed 5-watt design, maximizes communications range with
low interference risk from other users
• Configurable as a Remote or a Master unit
• Low power “sleep mode”—ideal for battery-powered solar sites
• Drop-in compatibility with MDS x710 radios (x710 mode)
• Supports a wide variety of modem speeds and bandwidths for
regulatory compliance in virtually all regions of the world
Model Number Codes
NOTE:
Some features might not be available on all units, depending on the
options purchased and regulatory constraints for the region in which
the radio will operate
.
2.3 Model Offerings
The radio is available in three model configurations:
• Ethernet—All SD features and functionality
• Standard—All features except Ethernet functionality
• x710—Direct, drop-in compatibility for networks using a mix of
SD and older MDS x710 radios. The Ethernet port is available for
radio management in x710 mode, but not for payload.
The unit’s complete model number is printed on the bottom label. Additional unit details are available through the
mands, described later in this manual.
MODEL1
and
MODEL2
com-
4 SD Series Reference Manual (x710 Mode) MDS 05-4670A01, Rev. E
2.4 Operating Modes and Applicable Manuals
SD Transceivers can be configured to operate in any one of three modes:
• x710 Mode—This mode provides direct, drop-in compatibility
with MDS x710 (4710 or 9710) transceivers, and uses the same
core command set as these radios. It is ideal for use in systems
containing a mix of newer SD radios and legacy MDS x710 units.
This manual covers x710 Mode radios.
• Packet Mode (including Packet w/MAC)—Payload data from
the radio’s serial or Ethernet ports is assembled into packets and
transmitted over the air. Packet mode supports Ethernet Bridging,
AES 128-bit encryption, and multihost operation. This mode is
ideal for networks containing all SD radios. This manual does not
cover Packet Mode radios. See below for applicable manuals.
• Transparent Mode—This mode is over-the-air compatible with
MDS x710 transceivers, while supporting payload data on the
Ethernet interface. This mode is ideal for mixed networks containing SD and MDS x710 radios. It allows currently deployed
x710 networks to add the ability to support Ethernet data. This
manual does not cover Transparent Mode radios. See below for
applicable manuals.
For Packet Mode and Transparent Mode operation, refer instead to the
following manuals for instructions:
• Start-Up Guide—Part No. 05-4847A01
• Reference Manual—Part No. 05-4846A01
Invisible place holder
Figure 3. SD Transceivers offer compatibility with older MDS x710
Transceivers (right), and may be used for replacement or
interoperability in these networks. A retrofit kit is available for
connector conversion (see Table 1).
MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) 5
2.5 Accessories and Spares
Table 1 lists common accessories and spare items for the transceiver.
GE MDS also offers an Accessories Selection Guide listing additional
items that can be used with the product. Contact your factory representative or visit
Accessory Description Part Number
Retrofit Kit, Digital Contains adapters and connectors
Retrofit Kit, Analog Contains adapters and connectors
DC Power Plug,
2-pin, polarized
Instruction Sheet
(for x710 Mode)
Flat Mounting
Brackets
(Standard)
DIN Rail Mounting
Bracket Kit
www.gemds.com
to obtain a copy of the guide.
Table 1. Accessories & Ancillary Items
needed to facilitate the replacement
of an existing MDS x710A/C/M
digital transceiver.
needed to facilitate the replacement
of an existing MDS x710A/C/M
analog transceiver.
Mates with power connector on radio
case. Screw terminals provided for
wires, threaded locking screws to
prevent accidental disconnect.
Describes the installation and setup
of the transceiver. A companion to
this Reference Manual.
Brackets that attach to the bottom of
the unit. Used for mounting to a flat
mounting service.
Contains bracket for mounting the
transceiver to standard 35 mm DIN
rails commonly used in equipment
cabinets and panels.
03-4696A01
03-4697A01
73-1194A53
05-4669A01
03-4123A14
03-4125A04
3.0 APPLICATIONS
Point-to-Multipoint, Multiple Address Systems (MAS)
This is the most common application of the transceiver. It consists of a
central master station and several associated remote units as shown in
Figure 4. An MAS network provides communication 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.
Often, such a system is used to convey telemetry data to and from
widely separated remote radios. Typical applications include automatic,
remote monitoring of gas wells, water tank levels, electric power distribution systems, and similar control and measurement functions.
The radio system can replace a network of remote monitors currently
linked to a central location using leased telephone lines or other hardwired means. At the central office of such a system, there is usually a
dedicated computer and some means of switching between individual
6 SD Series Reference Manual (x710 Mode) MDS 05-4670A01, Rev. E
lines coming from each remote monitor. In this type of system, there is
RTU
MASTER STATION
REMOTE RADIO
REMOTE RADIO
RTU
HOST SYSTEM
OR: SDA-Augmented
Master Station
RTU
REMOTE RADIO
RTU
REMOTE RADIO
a modulator/demodulator (modem) at the main computer and at each
remote site, usually built into the remote monitor itself. Since the cost of
leasing a dedicated-pair phone line is quite high, wireless technology is
often used as a cost-effective alternative.
Invisible place holder
Figure 4. Typical MAS Point-to-Multipoint Network
Point-to-Point System
Where permitted, the transceiver can also be used in a point-to-point
arrangement. A point-to-point system consists of just two radios—one
serving as a Master and the other as a Remote (see Figure 5). It provides
a simplex or half-duplex communications link for the transfer of data
between two locations.
Invisible place holder
Figure 5. Typical Point-to-Point Link
MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) 7
Continuously-Keyed versus Switched-Carrier Operation
The keying behavior of the master station can be used to describe the
operation of an MAS system.
Continuously-Keyed operation means the master station transmitter is
always keyed and an RF carrier is always present, even when there is no
data to send. The master station is always transmitting and receiving
simultaneously. Different frequencies must be used for transmit and
receive. This is the method used in many MAS systems, as is shown in
Figure 4. This network arrangement is useful for high-speed polling
applications.
NOTE: The SDx acting as a master does not support full-duplex oper-
ation.
Switched-Carrier operation is a half-duplex mode of operation where
the master station transmitter is keyed to send data and unkeyed to
receive.
Single-Frequency (Simplex) Operation
Single-frequency operation (also known as simplex) is a special case of
switched-carrier operation. Single frequency operation is automatically
selected whenever the transmit and receive frequencies are set to the
same value.
NOTE: Data turn-around times are increased when inter-working with
an MDS x710 network. This restriction does not apply to
homogeneous SD networks.
4.0 INSTALLATION PLANNING
Careful planning of the installation site helps achieve optimal performance
from the transceiver. This section discusses pre-installation factors. After
reviewing this section, refer to the step-by-step installation procedures beginning on Page 18.
4.1 Typical Installation
Figure 6 shows a typical station arrangement. Wiring connections and installation steps for the transceiver are provided in the sections that follow.
8 SD Series Reference Manual (x710 Mode) MDS 05-4670A01, Rev. E
Figure 6. Typical Remote Station Arrangement
6.675˝ (16.95 cm)
2.75˝ (7 cm)
4.2 Mounting Options
The transceiver is normally provided with flat mounting brackets
attached to the bottom of the radio as shown in Figure 7. An optional
35 mm DIN rail mounting bracket is also available. See “Optional DIN
Rail Mounting” on page 10.
Invisible place holder
Figure 7. Mounting Bracket Dimensions
MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) 9
NOTE: To prevent moisture from entering the radio, do not mount the
Step 1: Attach the bracket using the
Step 2: Clip the assembly onto the
DIN Rail. Removal is performed by
pulling down on the Release Tab.
Release Tab
two screws provided. (Attach to
the end opposite the unit’s connectors.)
case with the cable connectors pointing up. Also, dress all
cables to prevent moisture from running along the cables and
into the radio.
Transceiver dimensions are shown in Figure 8.
Figure 8. SD Transceiver Dimensions
Optional DIN Rail Mounting
The unit can be mounted with an optional 35 mm DIN Rail Mounting
Bracket Kit (Part No. 03-4125A04). Equipment cabinets and racks of
modern design often employ this type of mounting. Once the DIN
bracket is attached to the radio, it allows for quick installation and
removal of the radio from its mounting rail without the need for tools.
The DIN Rail bracket attaches to the unit’s case as shown in Figure 9.
The entire assembly then attaches to the mounting rail.
Figure 9. Attachment & Mounting of DIN Rail Bracket
(unit shown is for example only, and is not an SD Transceiver)
10 SD Series Reference Manual (x710 Mode) MDS 05-4670A01, Rev. E
4.3 Antennas and Feedlines
Antennas
The transceiver can be used with a number of antennas. The exact style
depends on the physical size and layout of your radio system. A directional Yagi (Figure 10) or corner reflector antenna is generally recommended at remote sites to minimize interference to and from other users.
Antennas of this type are available from several manufacturers,
including GE MDS. Contact your factory representative for details.
Invisible place holder
Figure 10. Typical Yagi Antenna (mounted to mast)
Feedlines
The selection of an antenna feedline is very important. Poor quality
cable should be avoided as it will result in power losses that might
reduce the range and reliability of the radio system.
Table 2, Table 3, and Table 4 show the approximate losses that will
occur when using various lengths and types of coaxial cable in the 200,
400, and 900 MHz bands. Regardless of the type used, the cable should
be kept as short as possible to minimize signal loss.
Table 2. Signal Loss in Coaxial Cables (at 200 MHz)
10 Feet
Cable Type
RG-8A/U 0.26 dB 1.27 dB 2.5 dB 5.07 dB
1/2 inch HELIAX
7/8 inch HELIAX
1-1/4 inch HELIAX
1-5/8 inch HELIAX
(3.05 Meters)
0.06 dB 0.38 dB 0.76 dB 1.60 dB
0.04 dB 0.21 dB 0.42 dB 0.83 dB
0.03 dB 0.16 dB 0.31 dB 0.62 dB
0.025 dB 0.13 dB 0.26 dB 0.52 dB
50 Feet
(15.24 Meters)
100 Feet
(30.48 Meters)
200 Feet
(60.96 Meters)
MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) 11
Table 3. Signal Loss in Coaxial Cables (at 400 MHz)
10 Feet
Cable Type
RG-8A/U 0.51 dB 2.53 dB 5.07 dB 10.14 dB
1/2 inch HELIAX
7/8 inch HELIAX
1-1/4 inch HELIAX
1-5/8 inch HELIAX
(3.05 Meters)
0.12 dB 0.76 dB 1.51 dB 3.02 dB
0.08 dB 0.42 dB 0.83 dB 1.66 dB
0.06 dB 0.31 dB 0.62 dB 1.24 dB
0.05 dB 0.26 dB 0.52 dB 1.04 dB
50 Feet
(15.24 Meters)
100 Feet
(30.48 Meters)
200 Feet
(60.96 Meters)
Table 4. Length vs. Loss in Coaxial Cables (at 900 MHz)
10 Feet
Cable Type
RG-8A/U 0.85 dB 4.27 dB 8.54 dB 17.08 dB
1/2 inch HELIAX
7/8 inch HELIAX
1-1/4 inch HELIAX
1-5/8 inch HELIAX
(3.05 Meters)
0.23 dB 1.15 dB 2.29 dB 4.58 dB
0.13 dB 0.64 dB 1.28 dB 2.56 dB
0.10 dB 0.48 dB 0.95 dB 1.90 dB
0.08 dB 0.40 dB 0.80 dB 1.60 dB
50 Feet
(15.24 Meters)
100 Feet
(30.48 Meters)
200 Feet
(60.96 Meters)
4.4 DC Power Connection
Power the transceiver from any well-filtered 10.0 to 30 Vdc power
source. The supply must be capable of providing at least 2.5 A of continuous current.
NOTE: Early SD4 models supported 10.5 to 16 Vdc power, not 10 to
30 Vdc. Check the labeling above the power connector to
confirm the operating range for your unit.
A power connector with screw terminals is provided with each unit (see
Figure 11). Strip the wire leads to 6 mm (1/4 inch) and insert in the wire
ports. Be sure to observe proper polarity as shown in Figure 11.
Figure 11. DC Power Connector (P/N 73-1194A39)
NOTE: The radio is designed for use in negative ground systems only.
12 SD Series Reference Manual (x710 Mode) MDS 05-4670A01, Rev. E
4.5 Grounding Considerations
5
9 6
1
To minimize the chance of damage to the transceiver and connected
equipment, a safety ground (NEC Class 2 compliant) is recommended
which bonds the antenna system, transceiver, power supply, and connected data equipment to a single-point ground, keeping all ground leads
as short as possible.
Normally, the transceiver is adequately grounded if the supplied flat
mounting brackets are used to mount the radio to a well-grounded metal
surface. If the transceiver is not mounted to a grounded surface, it is recommended that a safety ground wire be attached to one of the mounting
brackets or a screw on the transceiver’s case.
The use of a lightning protector is recommended where the antenna
cable enters the building. Bond the protector to the tower ground, if possible.
4.6 COM1 (Management) Connections
The radio’s
COM1
port is used to connect a PC for management or diag-
nostic purposes. Typically, a straight-through DB-9 cable can be used
for this purpose. If desired, construct a cable as shown in Figure 13, connecting Pins 2 (RXD), 3 (TXD), and 5 (GND).
Other custom cables or adapter kits are only needed for analog operation
or other special-use applications.
Figure 12. COM1 Connector (DB-9F)
As viewed from outside the radio
NOTE:
To prevent unintended keying of the transmitter during management
activities, set
COM1
port.
PTTSIG
to
OFF
, or do not connect to Pin 6 of the
MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) 13
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