GE MDS DS-1710 User Manual

Microwave Data Systems Inc.

MDS 1710 A/C/F

MDS 2710A/C/D

Data T ransceiver

MDS 05-3447A01, REV. E

FEBRUARY 2003

Installation & Operation Guide

QUICK START GUIDE

Below are the basic steps for installing the transceiver. Detailed instructions are provided in “Installation

Steps” on Page 9 of this manual.

1. Install and connect the antenna system to the radio

• Use good quality, low loss coaxial cable. Keep the feedline as short as possible.

• Preset directional antennas in the direction of desired transmission.

2. Connect the data equipment to the radio’s INTERFACE connector

• Connection to the radio must be made with a DB-25 Male connector. Connections for typical sys­tems are shown below.

• Connect only the required pins. Do not use a straight-through RS-232 cable with all pins wired.

• Verify the data equipment is configured as DTE. (By default, the radio is configured as DCE.)

DB-9 to DB-25 ExampleDB-25 to DB-25 Example

DB-25 DB-25

GND

11
2

TXD

3

RXD
RTS

4

RTU

CTS

5

(DTE)

6DSR

GND

20

77

DCD

8 8

As required for application

GND
TXD

2

RXD

3
4

RTS

4
5

CTS

5
6

DSR

GND

DCD

(DCE)

TRANSCEIVER

DB-9 DB-25

18

DCD

2

RXD

3

TXD

GND

(DTE)

DSR

RTS

CTS

5
6

20

7

RTU

3
2

5

7
6
4
5

As required for application

DCD
RXD

TXD
GND
DSR
RTS
CTS8

(DCE)

TRANSCEIVER

3. Apply DC power to the radio (10.5–16 Vdc @ 2.5 A minimum)

• Observe proper polarity. The red wire is the positive lead; the black is negative.

4. Set the radio’s basic configuration with a Hand-Held Terminal (HHT)

• Set the transmit frequency (

• Set the receive frequency (

• Set/verify the data rate using the

“TRANSCEIVER PROGRAMMING” on Page 17 for command details.)

TX xxx.xxxxx

RX xxx.xxxxx

BAUD

).

).

command. The default setting is

BAUD 4800 8N1

5. Verify proper operation by observing the LED display

• Refer to Table 5 on page 16 for a description of the status LEDs.

• Refine directional antenna headings for maximum receive signal strength using the
mand.

RSSI

. (Refer to

com-

TABLE OF CONTENTS

1.0 GENERAL....................................................................................1

1.1 Introduction ......................................................................................1

1.2 Differences Between Models ...........................................................2

1.3 Applications ......................................................................................2

Point-to-Multipoint, Multiple Address Systems (MAS)....................2

Point-to-Point System .....................................................................3

Continuously Keyed versus Switched Carrier Operation................4

Single Frequency (Simplex) Operation...........................................4

1.4 Product Configurator Codes .............................................................4

1.5 Accessories ......................................................................................5

2.0 GLOSSARY OF TERMS..............................................................5

3.0 INSTALLATION............................................................................8

3.1 Installation Steps ..............................................................................9

3.2 Transceiver Mounting .....................................................................11

3.3 Antennas and Feedlines ................................................................11

Feedlines......................................................................................12

3.4 Power Connection ..........................................................................12

3.5 Data Interface Connections ............................................................13

3.6 Using the Radio’s Sleep Mode .......................................................13

Sleep Mode Example ...................................................................13

4.0 OPERATION..............................................................................15

4.1 LED Indicators ................................................................................16

4.2 RSSI Measurement ........................................................................16

5.0 TRANSCEIVER PROGRAMMING ............................................17

5.1 Hand-Held Terminal Connection & Startup ....................................17

5.2 Hand-Held Terminal Setup .............................................................18

5.3 Keyboard Commands .....................................................................19

Entering Commands.....................................................................19

Error Messages ............................................................................19

5.4 Detailed Command Descriptions ...................................................22

AMASK [0000 0000–FFFF FFFF] ................................................22

ASENSE [HI/LO]...........................................................................23

BAUD [xxxxx abc].........................................................................23

BUFF [ON, OFF]...........................................................................23

CKEY [ON–OFF] ..........................................................................24

CTS [0–255] .................................................................................24

DATAKEY [ON, OFF] ....................................................................24

DEVICE [DCE, CTS KEY] ............................................................24

DKEY............................................................................................25

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D i

DLINK [ON/OFF/xxxx] ..................................................................25

DMGAP [xx]..................................................................................25

DTYPE [NODE/ROOT].................................................................25

DUMP...........................................................................................26

HREV............................................................................................26

INIT...............................................................................................26

INIT [2710]....................................................................................26

INIT [2720]....................................................................................26

KEY ..............................................................................................27

MODEL.........................................................................................27

MODEM [xxxx, NONE] .................................................................27

OWM [XXX...] ...............................................................................27

OWN [XXX...]................................................................................27

PTT [0–255]..................................................................................27

PWR [20–37] ................................................................................27

RSSI .............................................................................................28

RTU [ON/OFF/0-80]......................................................................28

RX [xxx.xxxxx] ..............................................................................28

RXTOT [NONE, 1-255].................................................................28

SCD [0-255]..................................................................................28

SER ..............................................................................................28

SHOW [DC, PORT, PWR].............................................................29

SNR..............................................................................................29

SREV............................................................................................29

STAT .............................................................................................29

TEMP............................................................................................29

TOT [1-255, ON, OFF]..................................................................30

TX [xxx.xxxxx]...............................................................................30

UNIT [10000...65000] ...................................................................30

6.0 TROUBLESHOOTING...............................................................30

6.1 LED Indicators ................................................................................31

6.2 Event Codes ...................................................................................31

Checking for Alarms—STAT command.........................................31

Major Alarms vs. Minor Alarms.....................................................31

Event Code Definitions.................................................................32

7.0 TECHNICAL REFERENCE.......................................................33

7.1 MDS 2710A/C/D Transceiver Specifications ..................................33

7.2 Performing Network-Wide Remote Diagnostics .............................34

7.3 Bench Testing Setup ......................................................................36

7.4 Helical Filter Adjustment ................................................................37

7.5 Upgrading the Radio’s Software .....................................................38

Using Radio Software Upgrade Diskette......................................38

Using Radio Configuration Software.............................................39

7.6 dBm-Watts-Volts Conversion Chart ................................................40

ii MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

Copyright Notice

This Installation and Operation Guide and all software described herein
are protected by copyright: © 2003 Microwav e Data Systems Inc . All
rights reserved.

Microwave Data Systems reserves its right to correct any errors and
omissions.

Operational Safety Notices

The radio equipment described in this guide emits radio frequency

RF Exposure

energy . Although the power level is lo w , the concentrated ener gy from a
directional antenna may pose a health hazard. Do not allow people to
come closer than 1.40 meters to the front of the antenna when the trans­mitter is operating with a 7 dBd (9.15 dBi) gain antenna. Use of higher
gain antennas means increasing the distance accordingly.

This manual is intended to guide a professional installer to install,
operate and perform basic system maintenance on the described radio.

ISO 9001 Registration

Microwav e Data Systems’ adheres to this internationally accepted qual­ity system standard.

To our Customers

We appreciate your patronage. You are our business. We promise to
serve and anticipate your needs. We will strive to give you solutions
that are cost effective, innovative, reliable and of the highest quality
possible. We promise to build a relationship that is forthright and ethi­cal, one that builds confidence and trust.

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 the
MDS Web site at www.microwavedata.com .

FCC Approval Notice

As of the printing date, VHF models are approved for operation in the
USA from 150 to 174 MHz. Contact MDS for current approval status.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D iii

iv MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

1.0 GENERAL

1.1 Introduction

This guide presents installation and operating instructions for
MDS 1710A/C/F and MDS 2710 A/C/D series digital radio trans­ceivers.

These transceivers (Figure 1) are data telemetry radios designed to
operate in a point-to-multipoint environment, such as electric utility
Supervisory Control and Data Acquisition (SCADA) and distribution
automation, gas field automation, water and wastewater SCADA, and
on-line transaction processing applications. They use microprocessor
control and Digital Signal Processing (DSP) technology to provide
highly reliable communications even under adverse conditions.

MDS 1710/2710 Series radios use continuous-phase frequency shift
keying (CPFSK) modulation with root duo-binary filtering (the sum of
two Nyquist-shaped, root-raised cosine responses). Demodulation uses
a Virterbi decoder and equalization with soft decision decoding.

Modulation and demodulation is accomplished using Digital Signal Pro­cessing (DSP). DSP adapts to differences between components from
unit to unit, and ensures consistent and repeatable performance in
ambient temperatures from –30 to +60 degrees Celsius. The use of Dig­ital Signal Processing eliminates the fluctuations and variations in
modem operation that can degrade the operation of analog circuits.

SERIAL NUMBER

LABEL

LED INDICATORS (4)

EXTERNAL

INTERFACE

CONNECTOR

(DB-25)

DIAGNOSTICS
CONNECTOR (RJ-11)

13.8 VDC POWER
CONNECTOR

ANTENNA CONNECTOR
(TYPE “N”)

Figure 1. Transceiver Connectors and Indicators

The transceiver is designed for trouble-free operation with data equip­ment provided by many other manufacturers, including Remote Ter­minal Units (RTUs), programmable logic controllers (PLCs), flow
computers, lottery terminals, automatic teller machines, and others.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 1

NOTE: Some features may not be available, based on the options

purchased and the applicable regulations for the region in
which the radio will operate.

1.2 Differences Between Models

All models of the MDS 1710/2710 Series are very similar in appearance
and functionality. The major differences are in frequency coverage,
channel bandwidth and data speed. Table 1 summarizes the available
models and identifies the characteristics of each.

To determine the specific settings for your radio (as originally shipped
from the factory), please refer to the Product Configurator chart shown
in Figure 4.

Table 1. MDS 1710/2710 Series Characteristics

Radio

Model No.

MDS 1710A 130–174 MHz 12.5 kHz 9600 bps
MDS 2710A 220–240 MHz 12.5 kHz 9600 bps
MDS 1710C 130–174 MHz 25 kHz 19200 bps
MDS 2710C 220-240 MHz 25 kHz 19200 bps
MDS 1710F 130–174 MHz 6.25 kHz 4800 bps
MDS 2710D 220–240 MHz 5 kHz 3200 bps

Consult factory for current regulatory approvals on these products.

Operating

Frequency

Channel

Bandwidth

Over-the-Air Data

Speed

NOTE: The operating software for A, C, D and F models is not inter-

changeable.

NOTE: The narrow bandwidth of the MDS 2710D and MDS 1710F

transceiver is not compatible with standard analog modems,
including the widely used Bell 202T. The MDS 2710D is
intended for digital RS-232 data only.

1.3 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 2. An 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.

2 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

Often, a radio system consists of many widely separated remote radios.
A point-to-multipoint or SCADA (Supervisory Control and Data Acqui­sition) system may be a new installation for automatic, remote moni­toring of gas wells, water tank levels, electric power distribution system
control and measurement, etc.

The radio system may replace a network of remote monitors currently
linked to a central location via leased telephone line. At the central
office of such a system, there is usually a large mainframe computer and
some means of switching between individual lines coming from each
remote monitor. In this type of system, there is 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, radio is often used as an alternative communi­cation medium.

Invisible place holder

RTU

RTU

MDS 9810

P
W
R

REMOTE RADIO

MDS 9810

DATA TRANSCEIVER

S
Y
N
C

D

T

A

X

T

D

A

I
N
T
E

R
F

R

A

X

C

D

E

I
D
I

1

A

3

G

.
8
V

D
C

+

A

–

N
T
E

N
N
A

–

REMOTE RADIO

MDS 9810

DATA TRANSCEIVER

MDS 9810

P
W
R

S
Y
N
C

D

T

A

X

T

D

A

I
N
T
E
R

F

R

A

X

C

D

E

I
D
I

1

A

3

G

.
8
V

D
C

+

A

–

N
T

E
N
N

A

–

MASTER RADIO

MDS 9810

DATA TRANSCEIVER

MDS 9810

P
W
R

S
Y
N
C

D

T

A

X

T

D

A

I
N
T
E

R
F

R

A

X

C

D

E

I
D
I

1

A

3

G

.
8
V

D
C

+

A

–

N
T

E
N
N

A

–

RTU

MDS 98

P
W
R

S

Y
N
C

D

T

10

A

X

T

D

A
IN

T
E
R
F

R

A

X

C

D

E

DATA TRAN

I
D
IA

1
3

G

.
8
V

D
C

+

–

MDS 9810

S
CE

IVER

A
N
T

E
N
N
A

–

RTU

REMOTE RADIO

RTU

MDS 9810

P
W
R

S
Y
N
C

D

T

A

X

T

D

A

IN
T
E

R
F

R

A

X

C

D

E

REMOTE RADIO

MDS 9810

DATA

TRANSCEIVER

MDS 9810

P
W
R

S
Y
N
C

D

T

A

X

T

D

A

I
N
T
E

R
F

R

A

X

C

D

E

I
D
I

1

A

3

G

.
8
V

D
C

+

A

–

N

T
E
N

N
A

–

MDS 9810

D
ATA TRANSCEI

VER

I
D
I

1

A

3.

G

8
V

D
C

+

A

–

N

T
E
N

N
A

–

REMOTE RADIO

HOST SYSTEM

Figure 2. Typical MAS Point-to-Multipoint Network

Point-to-Point System

Where permitted, the transceiver may 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—as shown in Figure 3. It
provides a simplex or half-duplex communications link for the transfer
of data between two locations.

HOST

COMPUTER

MASTER

RTU

REMOTE

Figure 3. Typical Point-to-Point Link

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 3

).

Continuously Keyed versus Switched Carrier Operation

The keying behavior of the master station can be used to describe an
MAS system.

Continuously Keyed operation means the master station transmitter is

always transmitting a carrier, even when there is no data to send. The
master station is always simultaneously transmitting and continuously
listening. Different frequencies must be used for transmit and receive.

NOTE: MDS 1710/2710 radios do not support full-duplex operation.

Therefore, switched carrier mode must be set to ON (

SWC ON

Switched Carrier operation is a half-duplex mode of operation where

the master station transmitter is keyed to send data and unkeyed to
receive.

THIS INFORMATION IS
SUBJECT TO
CHANGE.

DO NOT
PRODUCT ORDERING.

USE FOR

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 that data turn-around times are increased when a
single frequency configuration is used.

1.4 Product Configurator Codes

The full radio model number is printed on the radio enclosure. It pro­vides key information about how the radio was configured when it was
originally shipped from the factory. See Figure 4 for an explanation of
the configurator codes.

Invisible place holder

INPUT VOLTAGE

OPERATION
X= Base/Remote

1710A/C/F

2710A/C/D

MODE
N= Non-redundant

1= 10.5 to 16 VDC

DIAGNOSTICS
0= None
1= Network-wide

MODEM
B= 9600 bps
C= 19200 bps

D= 3200 bps
F= 4800 bps
0= None

RX FRQ. (MHz)

A= 130-140
A= 220-240*
B=140-150
D= 150-165
E= 165-175

BANDWIDTH
1= 12.5 kHz
3= 25 kHz
5= 5 kHz

(6.25 kHz @130-174)

AGENCY
N= N/A

C= China
F= FCC
I= Ind. Canada

TX FRQ. (MHz)
1= 130-140
1= 220-240*

2= 140-150
3= 150-165
4= 165-174

* Applies to MDS 2710 Models

FEATURES
0= Full

D= Demo

Mtg. Brackets.

A= Std.
B= None

SAFETY
N= N/A

Figure 4. MDS 1710x/2710x Product Configurator Codes

4 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

1.5 Accessories

The transceiver can be used with one or more of the accessories listed in

Table 2. Contact Microwave Data Systems for ordering information.

Table 2. MDS 1710/2710 Series Optional Accessories

Accessory Description MDS P/N

Hand-Held Terminal
Kit (HHT)

RTU Simulator Test module that simulates data from a

Order Wire Module External device that allows temporary

Power Supply Kit AC adaptor that converts 110/220 Vac to

Order Wire Handset Used with Order Wire Module (above). 12-1307A01
RJ-11 to DB-9 Adapter Used to connect a PC to the radio’s

EIA-232 to EIA-422
Converter Assembly

TTL Converter
Assembly

Radio Configuration
Software

VOX Assembly External unit used to key the radio when

19-inch Rack Mounting
Kit

Brown-Out Protection
Board

Terminal that plugs into the radio for
programming, diagnostics & control.
Includes carrying case, instructions and
cable set.

remote terminal unit. Comes with MDS
polling software (02-2093Axx) that runs
on a PC. Useful for testing radio
operation.

voice communication. Useful during
setup & testing of the radio system.

12 Vdc at 30 watts.

DIAG. port
External adapter plug that converts the

radio’s DATA INTERFACE connector to
EIA-422 compatible signaling.

External adapter plug that converts the
radio’s DATA INTERFACE connector to
TTL compatible signaling.

Provides diagnostics of the transceiver
(Windows-based PC required.)

audio input is present.
Allows mounting the transceiver in a

standard 19 inch rack cabinet. (Power
supply and Interface Board not included.)

PCB that protects against low voltage
conditions.

02-1501A01

03-2512A01

02-1297A01

01-3682A01

03-3246A01

03-2358A01

03-2223A01

03-3156A01

03-1098A02

02-1983A02

03-2567A01

2.0 GLOSSARY OF TERMS

If you are new to digital radio systems, some of the terms used in this
guide may be unfamiliar. The following glossary explains many of these
terms and will prove helpful in understanding the operation of the trans­ceiver.

Active Messaging

interrupt SCADA system polling communications (contrast with

sive messaging

passive messaging because it is not dependent upon the RTU polling
cycle.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 5

—This is a mode of diagnostic gathering that may

pas-

). Active (or intrusive) messaging is much faster than

Antenna System Gain —A figure, normally expressed in dB, repre-

senting the power increase resulting from the use of a gain-type antenna.
System losses (from the feedline and coaxial connectors, for example)
are subtracted from this figure to calculate the total antenna system gain.

Bit

—The smallest unit of digital data, often represented by a one or a

zero. Eight bits (plus start, stop, and parity bits) usually comprise a byte.

Bits-per-second

BPS

—Bits-per-second. A measure of the information transfer rate of

—See

BPS

.

digital data across a communication channel.

Byte

—A string of digital data usually made up of eight data bits and

start, stop and parity bits.

Decibel (dB)

—A measure computed from the ratio between two signal

levels. Frequently used to express the gain (or loss) of a system.

Data Circuit-terminating Equipment

Data Communications Equipment

Data Terminal Equipment

dBi

—Decibels referenced to an “ideal” isotropic radiator in free space.

—See

—See

DTE

—See

DCE

.

DCE

.

.

Frequently used to express antenna gain.

dBm

—Decibels referenced to one milliwatt. An absolute unit used to
measure signal power, as in transmitter power output, or received signal
strength.

DCE —Data Circuit-terminating Equipment (or Data Communications

Equipment). In data communications terminology, this is the “modem”
side of a computer-to-modem connection. The transceiver described in
this guide is a DCE device.

Digital Signal Processing

DSP

—Digital Signal Processing. In the transceiver, the DSP circuitry is

—See

DSP

.

responsible for the most critical real-time tasks; primarily modulation,
demodulation, and servicing of the data port.

DTE

—Data Terminal Equipment. A device that provides data in the
form of digital signals at its output. Connects to the DCE device.

Equalization

—The process of reducing the effects of amplitude, fre-

quency or phase distortion with compensating networks.

6 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

Fade Margin —The greatest tolerable reduction in average received

signal strength that will be anticipated under most conditions. Provides
an allowance for reduced signal strength due to multipath, slight antenna
movement or changing atmospheric losses. A fade margin of 20 to 30
dB is usually sufficient in most systems.

Frame

—A segment of data that adheres to a specific data protocol and
contains definite start and end points. It provides a method of synchro­nizing transmissions.

Hardware Flow Control

—A transceiver feature used to prevent data
buffer overruns when handling high-speed data from the RTU or PLC.
When the buffer approaches overflow, the radio drops the clear-to-send
(CTS) line, which instructs the RTU or PLC to delay further transmis­sion until CTS again returns to the high state.

Host Computer

—The computer installed at the master station site,

which controls the collection of data from one or more remote sites.

Intrusive Diagnostics

—A mode of remote diagnostics that queries and
commands radios in a network with an impact on the delivery of the
system “payload” data. See

Latency

—The delay (usually expressed in milliseconds) between when

Active messaging

.

data is applied to TXD (Pin 2) at one radio, until it appears at RXD
(Pin 3) at the other radio.

MAS

—Multiple Address System. A radio system where a central
master station communicates with several remote stations for the pur­pose of gathering telemetry data.

Master (Station)

—Radio which is connected to the host computer. It is

the point at which polling enters the network.

MCU

—Microcontroller Unit. This is the processor responsible for con-

trolling system start-up, synthesizer loading, and key-up control.

Microcontroller Unit
Multiple Address System
Network-Wide Diagnostics

—See

MCU

.

—See

MAS

.

—An advanced method of controlling and

interrogating MDS radios in a radio network.

Non-intrusive diagnostics
Passive messaging

—This is a mode of diagnostic gathering that does

—See

Passive messaging

.

not interrupt SCADA system polling communications. Diagnostic data
is collected non-intrusively over a period of time; polling messages are
carried with SCADA system data (contrast with

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 7

active messaging

).

Payload data

which is sent over the radio network. It is the transfer of payload data
that is the primary purpose of the radio communications network.

—This is the application’s user communication data

Point-Multipoint System

system designed with a central control station that exchanges data with
a number of remote locations equipped with terminal equipment.

Poll

—A request for data issued from the host computer (or master PLC)

to a remote radio.

PLC

—Programmable Logic Controller. A dedicated microprocessor
configured for a specific application with discrete inputs and outputs. It
can serve as a host or as an RTU.

Programmable Logic Controller

Remote (Station)

associated master station.

Remote Terminal Unit

Redundant Operation—

and two power supplies are available for operation, with automatic
switchover in case of a failure.

—A radio in a network that communicates with an

—A radio communications network or

—See

PLC

.

—See

RTU

.

A station arrangement where

two

transceivers

RTU

—Remote Terminal Unit. A data collection device installed at a
remote radio site. An internal RTU
ceiver to isolate faults to either the external RTU or the radio.

SCADA—Supervisory Control And Data Acquisition. An overall term
for the functions commonly provided through an MAS radio system.

Standing Wave Ratio—See SWR.

Supervisory Control And Data Acquisition—See SCADA.

SWR—Standing Wave Ratio. A parameter related to the ratio between

forward transmitter power and the reflected power from the antenna
system. As a general rule, reflected power should not exceed 10% of the
forward power (≈ 2:1 SWR).

simulator

is provided with the trans-

3.0 INSTALLATION

There are three main requirements for installing the transceiver—ade­quate and stable primary power, a good antenna system, and the correct
data connections between the transceiver and the data device. Figure 5
shows a typical remote station arrangement.

8 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

Invisible place holder

REMOTE TERMINAL
UNIT

RADIO

TRANSCEIVER

13.8 VDC
POWER

CABLE

13.8 VDC

2.5 A (Minimum)
POWER SUPPLY

Figure 5. Typical Remote Station Arrangement

ANTENNA SYSTEM

LOW-LOSS FEEDLINE

3.1 Installation Steps

Below are the basic steps for installing the transceiver. In most cases,
these steps alone are sufficient to complete the installation. More
detailed explanations appear at the end of these steps.

1. Mount the transceiver to a stable surface using the brack ets supplied
with the radio.

2. Install the antenna and antenna feedline for the station. Preset direc­tional antennas in the desired direction.

3. Connect the data equipment to the transceiver’s
connector. Use only the required pins for the application—Do not
use a fully pinned (25 conductor) cable. Basic applications may
require only the use of Pin 2 (transmit data—TXD), Pin 3 (Received
Data—RXD) and Pin 7 (signal ground). The radio can be keyed
with the use of the

DATAKEY command.

Additional connections may be required for some installations.
Refer to the complete list of pin functions provided in Table 4 on

page 14.

DATA INTERFACE

4. Measure and install the primary power for the radio. The red wire on
the power cable is the positive lead; the black is negative.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 9

NOTE: Use the radio in negative ground systems only.

5. Set the radio configuration. The transceiver is designed for quick
installation with a minimum of software configuration required in
most cases. The selections that must be made or verified for new
installations are:

• Transmit frequency

• Receive frequency

The operating frequencies are not set at the factory unless they were
specified at the time of order. Determine the transmit and receive
frequencies to be used, and follow the steps below to program them.

6. Connect a hand-held terminal (HHT) to the
the HHT beeps, press to receive the ready “>” prompt.

ENTER

• Set the operating frequencies using the

RX xxx.xxxxx (receive) commands.

• Press after each command. After programming, the HHT

ENTER

DIAG. connector. When

TX xxx.xxxxx (transmit) and

reads PROGRAMMED OK to indicate successful entry.

• Set other transceiver parameters as required. A complete list of
transceiver commands is provided in Section 5.0, TRANSCEIVER

PROGRAMMING.

10 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

3.2 Transceiver Mounting

Figure 6 shows the mounting dimensions of the transceiver.

Invisible place holder

ALTERNATE

POSITION

1.75"

2.75"

70 mm

4.44 CM

6.63"

168 mm

7.25"
184 mm

8.5"

216 mm

5.625"

143 mm

2.0"

2.25"

50 mm

57 mm

Figure 6. Transceiver Mounting Dimensions

3.3 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 the radio system. A direc­tional Yagi (Figure 7) 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.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 11

Invisible place holder

Figure 7. Typical Yagi Antenna (mounted to mast)

Feedlines

The selection of antenna feedline is very important. Poor quality cables
should be avoided as they will result in power losses that may reduce the
range and reliability of the radio system.

Table 3 shows the losses that will occur when using various lengths and

types of cable at 200 MHz. Losses at 130-174 MHz will be slightly
lower. Regardless of the type of cable used, it should be kept as short as
possible to minimize signal loss

Table 3. Length vs. Loss in Coaxial Cables at 200 MHz

3 Meters

Cable Type

RG-8A/U 0.32 dB 1.6 dB 3.2 dB 16 dB

1/2 inch HELIAX
7/8 inch HELIAX
1-1/4 inch HELIAX
1-5/8 inch HELIAX

† Cable loss slightly lower at 130-174 MHz.

(10 Feet)

0.10 dB 0.49 dB 0.98 dB 4.9 dB

0.05 dB 0.27 dB 0.54 dB 2.7 dB

0.04 dB 0.20 dB 0.40 dB 2.0 dB

0.03 dB 0.17 dB 0.33 dB 1.65 dB

15 Meters

(46 Feet)

30 Meters

(91 Feet)

150 Meters

†

(525 Feet)

3.4 Power Connection

The transceiver can be operated from any well-filtered 10.5 to 16 Vdc
power source. The power supply should be capable of providing at least

2.5 amperes of continuous current.
The red wire on the power cable is the positive lead; the black is nega-

tive.

NOTE: The radio is designed for use only in negative ground systems.

12 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

3.5 Data Interface Connections

The transceiver’s DATA INTERFACE connector is used to connect the
transceiver to an external DTE data terminal that supports the EIA-232
(formally RS-232) format. The transceiver supports asynchronous data
rates of up to 38400 bps. The data rate at the
may differ from the data rate used over the air.

DAT A INTERFACE connector

CAUTION

USE

ONLY REQUIRED

PINS

Table 4 lists each pin on the

DATA INTERFACE connector and describes

its function.
Do not use a 25 wire (fully pinned) cable for connection to the

INTERFACE

connector. Use only the required pins for the application.

DATA

Damage may result if improper connections are made. Typical applica­tions require the use of only Pins 1 through 8 for EIA-232 signaling.

3.6 Using the Radio’s Sleep Mode

In some installations, such as at solar-powered sites, it may be necessary
to keep the transceiver’s power consumption to an absolute minimum.
This can be accomplished using the Sleep Mode. In this mode, power
consumption is reduced to less than 16 milliamperes (nominal).

Sleep mode can be enabled under RTU control by asserting a ground (or
EIA-232 low) on Pin 12 of the radio’s

When Pin 12 is opened (or an EIA-232 high is asserted), the radio will
be ready to receive data within 75 milliseconds.

All normal functions are suspended while the radio is in sleep mode. The

PWR LED will be off, except for a quick flash every 5 seconds.

DATA INTERFACE connector.

Sleep Mode Example

The following example describes Sleep Mode implementation in a typ­ical system. Using this information, you should be able to configure a
system that will meet your own particular needs.

Example:

Suppose you need communications to each remote site only
once per hour. Program the RTU to raise an EIA-232 line once
each hour (DTR for example) and wait for a poll and response
before lowering it again. Connect this line to Pin 12 of the
radio’s

DAT A INTERF A CE connector. This will allow each RTU to

be polled once per hour with a significant savings in power con­sumption.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 13

Table 4. DATA INTERFACE Connector Pinouts

Pin
Number

1--Protective Ground. Connects to ground (negative supply

2INTXD—Transmitted Data. Accepts TX data from the

3 OUT RXD—Received Data. Outputs received data to the

4INRTS—Request-to-Send Input. Keys the transmitter when

5 OUT CTS—Clear-to-Send Output. Goes “high” after the

6 OUT DSR—Data Set Ready. Provides a +6 Vdc DSR signal

7--Signal Ground. Connects to ground (negative supply

8 OUT DCD—Data Carrier Detect. Goes “high” when the modem

9INTransmit Audio Input. Connects to the audio output of an

10 OUT RUS—Receiver Unsquelched Sensor. Not used in most

11 OUT Receive Audio Output. Connects to the audio input of an

12 IN Radio Inhibit (Sleep). A ground on this pin places the

13 -- Do not connect—Reserved for future use.
14 IN PTT—Push to Talk. This line is used to key the radio with

15 OUT Remote RTU Reset. Do not connect—Reserved for future

16 IN PTT

17 -- Do not connect—Reserved for future use.
18 IN/OUT Accessory Power. Unregulated Input/Output. Provides a

Input/
Output Pin Description

potential) on the radio’s PC board and chassis.

connected device.

connected device.

RTS is at logic high.

programmed CTS delay time has elapsed (DCE) or keys
an attached radio when RF data arrives (CTS KEY).

through a 2.5 kΩ resistor.

potential) at radio’s PC board.

detects a data carrier from the master station.

external (AFSK) modem. The input impedance is 600 Ω.
Use Pin 7 for the modem’s return lead.

installations, but is available as a convenience. Provides
+8 Vdc through a 1 kΩ resistor whenever the receiver
squelch is open, and drops to less than 1 Vdc when the
squelch is closed.

external (AFSK) modem. The output impedance is 600 Ω,
and the level is factory set to suit most installations. Use
Pin 7 for the modem’s return lead.

radio into the “sleep” mode. It turns off most circuits in the
radio, including transmit, receive, modem and diagnostic
functions. This allows for greatly reduced power
consumption, yet preserves the radio’s ability to be quickly
brought online.

an active-high signal of +5 Vdc.

use.

—Push to Talk. This line is used to key the radio with

an active-low signal of 0 Vdc.

source of input power for low current accessories.
Excessive drain on this connection will trip self-resetting
fuse F1 on the transceiver PC board. The voltage at this
pin will match the input voltage to the transceiver.

14 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

Table 4. DATA INTERFACE Connector Pinouts (Continued)

Pin
Number

19 OUT 9.9 Vdc Regulated Output. Provides a source of

20 -- Do not connect—Reserved for future use.
21 OUT RSSI—Received Signal Strength Indication. A DC

22 -- Do not connect—Reserved for future use.
23 IN Diagnostic Channel Enable. A ground on this pin causes

24 -- Do not connect—Reserved for future use.
25 OUT Alarm. A logic low (less than 0.5 volts) on this pin indicates

Input/
Output Pin Description

regulated voltage at 100 mA for low power accessories.

voltmeter may be connected to this pin to read the relative
strength of the incoming signal. Figure 8 is a chart showing
RSSI vs. DC voltage.

the radio’s microcontroller to open the DB-25 DATA
INTERFACE for diagnostics and control instead of the
normal RJ-11 DIAG. connection.

normal operation. A logic high (greater than 4 volts)
indicates that some alarm condition is present. This pin
can be used as an alarm output, provided the internal
series resistance of 1 kΩ is considered.

Invisible place holder

4.0 OPERATION

In-service operation of the transceiver is completely automatic. Once
the unit has been properly installed and configured, operator actions are
limited to observing the front panel LED status indicators for proper
operation.

If all parameters are correctly set, operation of the radio can be started
by following these steps:

1. Apply DC power to the transceiver.

2. Observe the LED status panel for the proper indications (Table 5).

3. If not done earlier, refine the antenna heading of the station to maxi­mize the received signal strength (RSSI) from the master station.

Use the

RSSI command from an HHT connected to the radio’ s DIAG.

connector.—See Section 5.0, TRANSCEIVER PROGRAMMING.
This can also be done with a DC voltmeter as described in

Section 4.2, RSSI Measurement.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 15

4.1 LED Indicators

Table 5 describes the function of each status LED.

PWR DCD TXD RXD

Table 5. LED Status Indicators

LED Name Description

PWR • Continuous—Power is applied to the radio, no problems detected.

• Rapid flash (five times-per-second)—Fault indication.

• Flashing once every 5 seconds—Radio is in Sleep mode.

DCD • Flashing—Indicates the radio is receiving intermittent data frames.

• Continuous—Radio is receiving a data signal from a continuously

keyed radio.

TXD An EIA-232 mark signal is being received at the DATA INTERFACE

RXD An EIA-232 mark signal is being sent out from the DATA INTERFACE

connector.

connector.

4.2 RSSI Measurement

As an alternative to using an HHT, the radio’s received signal strength
(RSSI) may be read with a DC voltmeter connected to Pin 21 of the

INTERFACE connector. Figure 8 shows the relationship between

received signal level and the DC voltage on Pin 21 of the

FACE connector. (Note: Readings are not accurate for signals stronger

DATA INTER-

than –50 dBm.)

Invisible place holder

5.0

4.5
4

3.5
3

2.5

+ DC VOLTS (PIN 21)

2

–110

–90

–70

SIGNAL LEVEL (dBm)

–50

DATA

Figure 8. RSSI vs. Vdc (Typical)

16 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

5.0 TRANSCEIVER PROGRAMMING

Programming and control of the transceiver is performed through the
radio’s RJ-11
Terminal (MDS P/N 02-1501A01). This section contains a reference
chart (Table 7) followed by detailed descriptions for each user com­mand.

NOTE: In addition to HHT control, Windows-based software is avail-

5.1 Hand-Held Terminal Connection & Startup

This section gives basic information for connecting and using the MDS
Hand-Held Terminal. For more information about the terminal, refer
also to the instructions included with each HHT kit.

The steps below assume that the HHT has been configured for use with
the transceiver (80 character screen display). If the HHT was previously
used with a different model transceiver, or if its default settings have
been changed, refer to Section 5.2, Hand-Held T erminal Setup for setup
details.

DIAG. (Diagnostics) connector with an MDS Hand-Held

able (MDS P/N 03-3156A01) to allow diagnostics and
programming using a personal computer. An installation
booklet and on-line instructions are included with the soft­ware. Contact MDS for ordering information.

Follow these steps to connect the HHT:

1. Connect the HHT’s coiled cord to the

DIAG. (RJ-11) jack on the

radio as shown in Figure 9. This automatically places the radio into
the control and programming mode.

As an alternative, the
used for programming instead of the

DATA INTERFACE (DB-25) connector may be

DIAG. jack. With this arrange-

ment, Pin 23 of the HHT cable must be grounded to enable the diag­nostic channel. (See Table 4.)

2. When the HHT is connected, it runs through a brief self-check,
ending with a beep. After the beep, press to obtain the ready

ENTER

“>” prompt.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 17

Invisible place holder

CTRL

ANTENNA

1

3

.

8

V

D

C

+

F5

F4

E

F3

D

3

F2

C

2

F1

A

J

B

1

I

(

6

/

H

5

G

O

4

N

)

F

*

9

M

8

L

T

7

S

K

#

R

0

–

Q

=

,

P

X

W

+

ACE

V

SP

ESC

U

BKSP

SHIFT

CTRL

Z

–

Y

ENTER

Figure 9. Hand-Held Terminal Connected to the Transceiver

5.2 Hand-Held Terminal Setup

The following is a set of instructions for re-initializing an HHT for use
with the transceiver. These steps may be required if the HHT was previ­ously used with a different radio, or if the HHT default settings have
been inadvertently altered.

1. Plug the HHT into the
pressing the , and keys in sequence. The display

SHIFT

DIAG. connector. Enable the setup mode by

SPACE

shown in Figure 10 appears.

Invisible place holder

FF1FFF

A

B

C

Figure 10. HHT Setup Display

D

E

2. The first of 15 menu items is displayed. Settings are reviewed by
pressing the NEXT function controlled by the key. Parameter set-

E

tings are changed by pressing the ROLL function controlled by the

A

key .

18 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

3. Set up the HHT as listed in Table 6.

Table 6. HHT Operational Settings

Parameter Setting Parameter Setting

Re-init HT NO Scroll On 33rd
Baud Rate 9600 Cursor ON
Comm bits 8,1,n CRLF for CR OFF
Parity Error OFF Self Test FAST
Key Repeat OFF Key Beep ON
Echo OFF Screen Size 80
Shift Keys YES Menu Mode LONG
Ctl Chars PROCS

5.3 Keyboard Commands

Table 7 is a reference chart of software commands for the transceiver.

Programmable information is shown in brackets [ ] following the com­mand name. See Section 5.4, Detailed Command Descriptions for
detailed command descriptions.

Entering Commands

To enter a command, type the command, followed by an key-

ENTER

stroke. For programming commands, the command is followed by

SPACE

and the appropriate information or values, then

ENTER

.

Here are some additional points to remember when using the HHT:

• Use the key to access numbers; press again to return to letter

SHIFT

mode.

• Use the key to edit information or commands entries.

ESC/BKSP

• The flashing square cursor ( ) indicates that letter mode is
selected.

• The flashing superscript rectangular cursor ( ) indicates that
number mode is selected.

Error Messages

Listed below are some possible error messages that may be encountered
when using the HHT:

UNKNOWN COMMAND—The command was not recognized. Refer to the

command description for command usage information.

INCORRECT ENTRY—The command format or its associated values were

not valid. Refer to the command description for command usage infor­mation.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 19

COMMAND F AILED—The command was unable to successfully complete.

This may indicate an internal software problem.

NOT PROGRAMMED —Software was unable to program the internal radio

memory or the requested item was not programmed.This is a serious
internal radio error. Contact MDS for assistance.

TEXT TOO LONG—Response to OWN or OWM command when too many

characters have been entered. Refer to the command description for
command usage information.

NOT AVAILABLE—The entered command or parameter was valid, but it

referred to a currently unavailable choice. Refer to the command
description for command usage information.

ACCESS DENIED—The command is unavailable to the user. Refer to the

command descriptions for command information.

EEPROM F AILURE— The INIT command was unable to write to EEPROM.

This is a serious internal radio error. Contact MDS for assistance.

Table 7. Command summary

Command name Function

AMASK [0000

0000–FFFF FFFF]

Details page 22

ASENSE [HI/LO]

Details page 23

BAUD [xxxxx abc]

Details page 23

BUFF [ON, OFF]

Details page 23

CTS [0–255]

Details page 24

CKEY [ON–OFF]

Details page 24

DATAKEY [ON, OFF]

Details page 24

DKEY

Details page 25

DLINK [ON/OFF/xxxx]

Details page 25

Set or display hex code identifying which events
trigger an alarm.

Set or display the state of the alarm output signal
to ACTIVE HI or ACTIVE LO.

Set or display the DATA INTERFACE data rate
and control bits.

Enables or disables the internal radio data buffer.

Set or display the Clear-to-Send delay in seconds.

Enables or disables the continuously keyed
mode. Note: Remotes cannot receive when
keyed.

Toggles between key-on-data and key-on-RTS.

Dekey the radio (transmitter OFF). This is
generally a radio test command.

Configures local diagnostic link protocol.

DMGAP [xx]

Details page 25

(Diagnostics) Sets the amount of time to wait after
the receipt of a character before interpreting the
next received character as the start of a new
message.

20 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

Table 7. Command summary (Continued)

Command name Function

DTYPE [NODE/ROOT]

Details page 25

(Diagnostics) Sets up a radio as a Root or Node
radio. Associated commands are GATE and
PEER. (See MDS’ Network-Wide Diagnostics
System Handbook (MDS P/N 05-3467A01) for
details.)

DUMP

Details page 26

HREV

Details page 26

INIT

Details page 26

INIT [2710]

Details page 26

INIT [2720]

Details page 26

KEY

Details page 27

MODEL

Details page 27

MODEM [xxxx, NONE]

Details page 27

OWM [XXX...]

Details page 27

OWN [XXX...]

Details page 27

PTT [0–255]

Details page 27

Display all programmable settings.

Display the Hardware Revision level.

Set radio parameters to factory defaults.

Restores certain transceiver defaults before using
the INIT xx20 command.

Configure radio for use with an MDS model P-20
chassis.

Key the radio (transmitter ON). This is generally
used for radio testing.

Display the model number of the radio.

Set the modem characteristics of the radio.

Set or display the owner’s message.

Set or display the owner’s name.

Set or display the Push-to-Talk delay in
milliseconds.

PWR [20–37]

Details page 27

RSSI

Details page 28

RTU [ON/OFF/0-80]

Details page 28

RX [xxx.xxxxx]

Details page 28

RXTOT [NONE, 1-255]

Details page 28

SCD [0-255]

Details page 28

SER

Details page 28

SHOW [DC, PORT, PWR]

Details page 29

SREV

Details page 29

STAT

Details page 29

Set or display the transmit power setting.

Display the Received Signal Strength Indication.

Enables or disables the radio’s internal RTU
simulator and sets the RTU address.

Set or display receiver frequency.

Set or display the value of the receive time-out
timer.

Set or display the Soft-carrier Dekey delay in
milliseconds.

Display the radio serial number.

Display the DC voltages, diagnostics port, and
transmit power level.

Display the Software Revision Level.

Display radio status and alarms.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 21

Table 7. Command summary (Continued)

Command name Function

TEMP

Details page 29

Display the internal temperature of the radio in
degrees Celsius.

TOT [1-255, ON, OFF]

Details page 30

TX [xxx.xxxxx]

Details page 30

UNIT [10000...65000]

Details page 30

Set or display the Time-out Timer delay in
milliseconds.

Set or display the transmit frequency.

Set or display the transceiver’s unit address.

5.4 Detailed Command Descriptions

The only critical commands for most applications are transmit and
receive frequencies (
the additional commands allows you to tailor the transceiver for a spe­cific use, or conduct basic diagnostics on the radio. This section gives
more detailed information for the user commands previously listed in

Table 7.

In many cases, the commands shown here can be used in two ways.
First, you can type only the command name to view the currently pro­grammed data. Secondly, you can set or change the existing data by
typing the command, followed by a space, and then the desired entry. In
the list below, allowable programming variables, if any, are shown in
brackets following the command name.

RX xxx.xxxxx, TX xxx.xxxxx). However, proper use of

AMASK [0000 0000–FFFF FFFF]

The

AMASK (alarm mask) command displays or sets which events cause

the alarm output signal to be active. Normally, the mask is

FFFF FFFF,

meaning that any of the 32 possible events will activate the alarm output
signal. No special configuration is required for typical applications.

Entering the

AMASK command alone displays the current setting of

alarm events in hexadecimal format.
Entering the

AMASK command followed by an eight-digit hexadecimal

number reprograms the specified events to trigger an alarm.
The eight-digit hexadecimal number used as the command parameter is

used to classify up to 32 events as alarm triggers for the alarm output
status line. (See Table 8 on page 32 for a list of event codes.) The hex
value for the mask corresponds to the hex value for the
(see the

STAT command description).

STAT command

22 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

Each bit that is a ‘1’ identifies an associated alarm condition that can
trigger the alarm output status line. Each bit that is a ‘0’ treats the asso­ciated alarm as irrelevant when deciding whether or not to assert the
alarm output status line. For more information on tailoring the alarm
response, contact the MDS Technical Services Department.

ASENSE [HI/LO]

The

ASENSE command sets or displays the sense of the alarm output at

Pin 25 of the

DATA INTERFACE connector.

Entering the
active high or low. Entering the

ASENSE command alone shows whether the alarm output is

ASENSE command followed by HI or LO

resets the alarm output to active high or low.

BAUD [xxxxx abc]

This command sets (or displays) the communication attributes for the

DATA INTERFACE port. It has no effect on the RJ-11 DIAG. port.

The first parameter (

xxxxx) is baud rate. Baud rate is specified in

bits-per-second (bps) and must be one of the following speeds: 110, 300,
1200, 2400, 4800, 9600, 19200, or 38400.

The second parameter of the

BAUD command (abc) is a three-character

block indicating how the data is encoded:

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 4800 baud, 8 data bits, no parity, 1 stop bit
(Example:

4800 8N1).

NOTE: 7N1, 8O2, and 8E2 are invalid communication settings and are

not supported by the transceiver.

BUFF [ON, OFF]

This command sets or displays the received data handling mode of the
radio. The command parameter is either

ON or OFF. The default is ON.

The setting of this parameter affects the timing of how received RF data
is sent out the

INTERFACE connector. Outgoing (transmitted) data is not

affected by this setting.

If data buffering is
average latency. Data bytes are thus sent out the

OFF, the radio operates with the lowest possible

INTERFACE port as soon

as an incoming RF data frame is disassembled. Average and typical
latency will both be below 10 ms, but idle character gaps may be intro­duced into the outgoing data flow.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 23

If data buffering is ON, the radio operates in seamless mode. Data bytes
will be sent over the air as quickly as possible, but the receiver buffers
(stores) 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.

Note that 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. Adherence to this rule is left up to the user.

CKEY [ON–OFF]

The

CKEY command enables or disables the continuously-keyed func-

tion of the radio. When

CKEY is set to ON, the radio is continuously

keyed.

CTS [0–255]

The

CTS (clear-to-send) command selects or displays the timer value

associated with the CTS line response. The command parameter ranges
from 0 to 255 milliseconds.

For DCE operation, the timer specifies how long to wait after the RTS
line goes high, before the radio asserts CTS and the DTE can transmit
the data. A CTS value of zero keys the radio and asserts the CTS line
immediately after the RTS line goes high.

For CTS Key operation (see
long to wait after asserting the CTS, before sending data out the

INTERFACE port. A timer value of zero means that data will be sent out

DEVICE command), the timer specifies how

DATA

the data port without imposing a key-up delay. (Other delays may be
present based on selected radio operating parameters.)

DATAKEY [ON, OFF]

The

DATAKEY command sets or displays the ability of the radio to key the

transmitter as data is received at the

DATA INTERFACE connector.

Asserting RTS keys the radio regardless of this command setting.
If

DATAKEY is set to ON, the radio will key when a full data-character is

received at the transceiver’s
set to

OFF, the radio needs to be keyed by asserting either the RTS or

PTT signal or with the

DATA INTERFACE connector. If DATAKEY is

CKEY or KEY command.

DEVICE [DCE, CTS KEY]

The

DEVICE command sets or displays the device behavior of the radio.

The command parameter is either

24 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

DCE or CTS KEY.

The default selection is DCE. In this mode, CTS will go high following
RTS, subject to the CTS programmable delay time. If the
mand is set to

ON, keying can be stimulated by the input of characters at

DATAKEY com-

the data port. Hardware flow control is implemented by signaling the
CTS line if data arrives faster than it can be buffered and transmitted.

CTS KEY is selected, the radio is assumed to be controlling another

If
radio. The RTS line is ignored and the CTS line is used as a keyline con­trol for the other radio. CTS is asserted immediately following the
receipt of RF data, but data will not be sent out the

DAT A INTERF A CE port

until after the CTS programmable delay time has expired. (This gives
the other radio time to key.)

DKEY

This command deactivates the transmitter after it has been keyed with

KEY command.

the

DLINK [ON/OFF/xxxx]

This command is used to configure the local diagnostic link protocol
used in network-wide diagnostics.

Entering

DLINK ON enables the diagnostic link. Entering DLINK OFF dis-

ables the diagnostic link.

To change the diagnostic link, enter

DLINK followed by one of the fol-

lowing baud rates: 1200, 2400, 4800, 9600, 19200 (default).

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 data port baud rates are slow,
the gap between characters within a poll may be so long that the radio
interprets the next character as the start of a new poll. When diagnostics
is being performed using passive messaging (see Performing Net-

work-Wide Remote Dia gnostics on page 34), this command may be used

to change this behavior.

DTYPE [NODE/ROOT]

This command establishes the local radio as a root radio or node radio
for network-wide diagnostics. Entering
radio as a node radio. Entering
radio. Entering the

DTYPE command alone displays the current setting.

DTYPE ROOT configures the radio as a root

DTYPE NODE configures the

See “Performing Network-Wide Remote Diagnostics” on page 34. Two
associated commands are

GATE and PEER. See MDS’ Network-Wide

Diagnostics System Handbook (MDS P/N 05-3467A01) for details.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 25

DUMP

This command displays all the programmed settings of the radio. The
HHT display is too small to list all the command settings at one time.
Therefore, this command is most useful if the command is issued from
a computer or full-screen terminal.

HREV

This command displays the transceiver’s hardware revision level.

INIT

The

INIT command is used to re-initialize the radio’s operating parame-

ters to the factory defaults. This may be helpful when trying to resolve
configuration problems that may have resulted from the entry of one or
more improper command settings. Entry of this command allows you to
get back to a known working state. The following changes to the radio
are made when

CTS is set to 0

•

DATAKEY is set to ON

•

INIT is entered:

• DEVICE is set to DCE

• PTT is set to 0

SCD is set to 0

•

•

TOT is set to 30 seconds and set to ON

• PWR is set to +37 dBm (5 watts)

All other commands stay at their previously established settings.

INIT [2710]

This command sets the transceiver for operation outside the MDS model
P-20 chassis by setting the following parameters as shown.

ASENSE ACTIVE HI
AMASK FFFF FFFF
RXTOT NONE (receive time-out timer disabled)

This command can be used subsequent to using the

(assert alarm output on all alarms)

INIT 2720 command

to restore the standard transceiver defaults.

INIT [2720]

This command sets the transceiver for operation inside the model P-20
chassis by setting the following parameters as shown.

ASENSE ACTIVE LO
AMASK FFFF 0000
RXTOT 20 (20 minute time-out timer)

(trigger on major alarms)

26 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

KEY

This command activates the transmitter. See also the

DKEY command.

MODEL

This command displays the radio’s model number code.

MODEM [xxxx, NONE]

This command selects the radio’s modem characteristics. Enter 9600 or
3200 for digital operation, or enter NONE to select analog operation.
For MDS 1710 digital operation the proper settings are
2710A,

19200 for the MDS 1710C, and 4800 for the MDS 1710F.

For MDS 2710 operation, the proper settings are
2710D,

9600 for the MDS 2710A, and 19200 for the MDS 2710C.

9600 for the MDS

3200 for the MDS

OWM [XXX...]

This is a command to display or program an owner’s message. To pro­gram the owner’s message, type

ENTER

.

To display the owner’s message, type

OWM then the message, followed by

OWM then . The owner’s

ENTER

message appears on the display.

OWN [XXX...]

This is a command to display or program an owner’ s name. To program
the owner’s name, type

To display the owner’s name, type OWN then . The owner’s

OWN then the name, followed by .

ENTER

ENTER

name appears on the display.

PTT [0–255]

This command sets or displays the key-up delay in milliseconds.
This timer specifies how long to wait after the radio receives a key signal

from either the PTT or RTS lines (on the

DATA INTERFA CE), before actu-

ally keying the radio.

PWR [20–37]
NOTE: This function may not be available, depending on certification

requirements in a particular country.

This command displays or sets the desired RF forward output power set­ting of the radio. The

PWR command parameter is specified in dBm and

can range from 20 through 37. The default setting is 37 dBm (5 watts).
To read the actual (measured) power output of the radio, use the

PWR

command. A dBm-to-watts conversion chart is provided in

SHOW

Section 7.6.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 27

RSSI

This command continuously displays the radio’s Received Signal
Strength Indication (RSSI) in dBm units, until you press the Enter key.
Incoming signal strengths from –50 dBm to –120 dBm can be read.

RTU [ON/OFF/0-80]

This command re-enables or disables the radio’s internal RTU simu­lator, which runs with MDS’ proprietary polling programs (poll.exe and
rsim.exe). The internal RTU simulator is available whenever a radio has
diagnostics enabled. This command also sets the RTU address that the
radio will respond to.

The internal RTU can be used for testing system payload data or pseudo
bit error rate testing. It can also be helpful in isolating a problem to either
the external RTU or the radio.

RX [xxx.xxxxx]

This command selects or displays the radio’s receive frequency in MHz.
The frequency step size is 6.25 kHz for the MDS 2710A/C and 5.0 kHz
for the MDS 2710D.

If the customer frequency has not been programmed at the factory, a
default frequency will be programmed in the radio near the center of the
frequency band.

RXTOT [NONE, 1-255]

The

RXTOT command selects or displays the receive time-out timer value

in minutes. This timer triggers an alarm (event 12) if data is not detected
within the specified time.

Entering the
value in minutes. Entering the
ranging from 0 to 255 resets the timer in minutes. Entering the
command with the parameter

RXTOT command without a parameter displays the timer

RXTOT command with a parameter

RXTOT

NONE disables the timer.

SCD [0-255]

This command displays or changes the soft-carrier dekey delay in milli­seconds.

This timer specifies how long to wait after the removal of the keying
signal before actually releasing the transmitter. A value of 0 millisec­onds will unkey the transmitter immediately after the removal of the
keying signal.

SER

This command displays the radio’s serial number as recorded at the fac­tory.

28 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

SHOW [DC, PORT, PWR]

SHOW command displays different types of information based on

The
the command variables. The different parameters are:

•

DC—Display DC input/output voltages
PORT—Display the connector port (RJ-11 or DB-25) that is active

•

for diagnostics and control.

•

PWR—Display RF power output

SNR

This command continuously displays the signal-to-noise ratio of the
received signal expressed in dB, until you press the Enter key. As used
in this guide, the signal-to-noise measurement is based upon the signal
level following equalization, for received frames.

The SNR is an indication of the received signal quality. The SNR indi­cation ranges from 10 dB to 33 dB. A value of 10 dB represents a very
poor signal. A value of 24 dB represents a very good signal.

When the SNR command is used, it causes the

DIAG. port to enter an

update mode, and the signal-to-noise ratio is updated and redisplayed
every 2 seconds. The SNR continuously updates until the key is

ENTER

pressed.

SREV

This command displays the software revision level of the transceiver
firmware.

STAT

This command displays the current alarm status of the transceiver.

If no alarms exist, the message

NO ALARMS PRESENT appears at the top

of the HHT display.

If an alarm does exist, a two-digit code (00–31) is displayed and the
alarm is identified as “Major” or “Minor.” A brief description of the
alarm code is also given.

If more than one alarm exists, the word
the screen and additional alarms are viewed by pressing the

MORE appears at the bottom of

ENTER

key. Detailed descriptions of event codes are provided in Table 8 on

page 32.

TEMP

This command displays the internal temperature of the transceiver in
degrees Celsius.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 29

TOT [1-255, ON, OFF]

This command sets or displays the transmitter Time-out Timer value
(1–255 seconds), as well as the timer status (
on, and the radio remains keyed for a longer duration than the

ON or OFF). If the timer is

TOT value,

the transmitter is automatically unkeyed.
When this happens, the radio must be commanded back to an unkeyed

state before a new keying command is accepted. The default timer value
is 30 seconds.

TX [xxx.xxxxx]

This command selects or displays the radio’s transmit frequency in
MHz. The frequency step size is 6.25 kHz for the MDS 2710A/C and

5.0 kHz for the MDS 2710D.
If the customer frequency has not been programmed at the factory, a

default frequency will be programmed in the radio near the center of the
frequency band.

UNIT [10000...65000]

This command selects or displays the radio’s unit address. The factory
default setting is the last five digits of the transceiver’s serial number.
The unit address is used in network diagnostics. See MDS’ Net­work-Wide Diagnostics System Handbook (MDS P/N 05-3467A01) for
more information.

6.0 TROUBLESHOOTING

Successful troubleshooting of the radio system is not difficult, but it
requires a logical approach. It is best to begin troubleshooting at the
master station, as the rest of the system depends on the master for
polling commands. If the master station has problems, the operation of
the entire network can be compromised.

It is good practice to start by checking the simple things. For proper
operation, all radios in the network must meet these basic requirements:

• Adequate and stable primary power. The radio contains an inter­nal self-resetting fuse (4A). Remove and re-apply primary power
to reset.

• Secure connections (RF, data and power)

• An efficient and properly aligned antenna system with a good
received signal strength (at least –90 dBm). It is possible for a
system to operate with weaker signals, but reliability will be
degraded.

• Proper programming of the transceiver’s operating parameters
(see Section 5.0, TRANSCEIVER PROGRAMMING).

30 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

• The correct interface between the transceiver and the connected
data equipment (correct cable wiring, proper data format, timing,
etc.)

6.1 LED Indicators

The LED status indicators are an important troubleshooting tool and
should be checked whenever a problem is suspected. Table 5 on page 16
describes the function of each status LED.

6.2 Event Codes

When an alarm condition exists, the transceiver creates a code that can
be read on an HHT connected to the
helpful in resolving many system difficulties. Refer to Table 8 for a def­inition of the event codes.

Checking for Alarms—STAT command

DIAG. port. These codes can be very

To check for alarms, enter

NO ALARMS PRESENT appears at the top of the display (Figure 11).

sage

STAT on the HHT. If no alarms exist, the mes-

Invisible place holder

Figure 11. HHT Display in Response to STAT Command

If an alarm does exist, a two-digit alarm code (00–31) is displayed and
the event is identified as a Major or Minor Alarm. A brief description of
the alarm is also given.

If more than one alarm exists, the word
the screen. To view additional alarms, press .

MORE appears at the bottom of

ENTER

Major Alarms vs. Minor Alarms

Major Alarms—report serious conditions that generally indicate a hard­ware failure, or other abnormal condition that will prevent (or seriously
degrade) further operation of the transceiver. Major alarms generally
indicate the need for factory repair. Contact MDS for further assistance.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 31

Minor Alarms—report conditions that, under most circumstances will
not prevent transceiver operation. This includes out-of-tolerance condi­tions, baud rate mismatches, etc. The cause of these alarms should be
investigated and corrected to prevent eventual system failure.

Event Code Definitions

Table 8 contains a listing of all event codes that may be reported by the

transceiver.

Table 8. Event Codes

Event
Code

01 Major Improper software detected for this radio model.
02 Major The model number of the transceiver is unprogrammed.
04 Major One or both of the internal programmable synthesizer loops is

06 Major An unrecoverable fault was detected on the A-to-D chip. The

07 Major One or more of the radio’s internal voltage regulators is

08 Major The system is reporting that it has not been calibrated. Factory

09 -- Not used.
10 Major The internal microcontroller was unable to properly program

11 -- Not used.
12 Major Receiver time-out. No data received within the specified

13 Major Transmitter time-out. The radio was keyed for a duration

14–15 -- Not used.

16 Minor Not used.
17 Minor A data parity fault has been detected on the DATA

18 Minor A data framing error has been detected on the DATA

19–24 -- Not used.

25 Minor The 5.6 volt power regulator is out-of-tolerance. If the error is

26 Minor The DC input voltage is out-of-tolerance. If the voltage is too

27, 28 -- Not used

31 Minor The transceiver’s internal temperature is approaching an

Event
Class Description

reporting an out-of-lock condition.

radio will not receive data.

reporting a failure. The radio will not operate.

calibration is required for proper radio operation.

the system to the appropriate EEPROM defaults. A hardware
problem may exist.

receiver time-out time.

exceeding the time-out timer setting. (This alarm clears the
next time the radio keys.)

INTERFACE connector. This usually indicates a parity setting
mismatch between the radio and the RTU.

INTERFACE connector. This may indicate a baud rate
mismatch between the radio and the RTU.

excessive, operation may fail.

far out of tolerance, operation may fail.

out-of-tolerance condition. If the temperature drifts outside of
the recommended operating range, system operation may fail.

32 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

7.0 TECHNICAL REFERENCE

7.1 Transceiver Specifications

TRANSMITTER SYSTEM SPECIFICATION

Operating Frequency: See Transmitter Specifications
Frequency Stability: ±1.5 ppm
Adjacent Channel Power: –65 dBc (MDS 1710A/2710A)

Carrier Power Accuracy: ±2 dB

RECEIVER SYSTEM SPECIFICATION

Operating Frequency: See Receiver Specifications
Maximum Usable Sensitivity: –111 dBm for 1 x 10
Co-Channel Rejection: –12 dB

DATA CHARACTERISTICS

Signaling Standard: EIA-232
Connector: DB-25 Female
Data Interface Rates: 110 bps to 38.4 kbps1200, 2400, 4800, 9600,

Data Latency: 10 ms maximum, including RTS/CTS delay
Byte Length: 10 or 11 bits

–60 dBc (MDS 1710C/2710C)
–55 dBc (MDS 1710F/2710D)

-6

BER

19200, 38400 bps—asynchronous

TRANSMITTER

Frequency Range: 220-240 MHz (MDS 2710A/D)

Modulation Type: Binary CPFSK
Carrier Power: 0.1 Watts to 5 Watts @13.8 Vdc
Duty Cycle: Continuous
Output Impedance: 50 ohms
Frequency Stability: MDS 1710 ±1.0 ppm

Channel Spacing: 6.25 kHz steps (MDS 1710A/C/F and 2710A/C)

Transmitter Spurious
Radiated Emissions: –57 dBm, 30 MHz to 1 GHz

Harmonics:

2nd harmonic: 57 dBc
3rd harmonic & higher: 57 dBc

Time-out Timer: 30 seconds (default). Selectable with TOT

Transmitter Keying: Data activated or RTS

130-174 MHz (MDS 1710A/C/F)
220-222 MHz (MDS 2710D)

See Figure 4 on Page 4 for detailed listing

MDS 2710 ±1.5 ppm

5.0 kHz steps (MDS 2710D)

6.25 kHz (MDS 1710A/C/F @ 130-174 MHz)

–47 dBm, 1 GHz to 12.5 GHz

command

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 33

RECEIVER

Frequency Range: 220-240 MHz (MDS 2710A/D)

Type: Double conversion superheterodyne
Frequency Stability: ±1.5 ppm
Maximum Usable Sensitivity: –111 dBm for 1 x 10
Spurious

Response Rejection: 70 dB
Intermodulation

Response Rejection: 65 dB
Receiver Spurious

Conducted Emissions: –57 dBm, 9 kHz to 1 GHz

Receiver Spurious
Radiated Emissions: –57 dBm, 30 MHz to 1 GHz

Bandwidth: 5 kHz (MDS 2710D)

130-174 MHz (MDS 1710A/C/F)
220-222 MHz (MDS 2710D)

See Figure 4 on Page 4 for detailed listing

-6

BER

–47 dBm, 1 GHz to 12.5 GHz

–47 dBm, 1 GHz to 12.5 GHz

6.25 kHz (MDS 1710F)

12.5 kHz (MDS 1710A, 2710A)
25 kHz (MDS 1710C, 2710C)

PRIMARY POWER

Voltage: 13.8 Vdc Nominal (10.5 to 16 Vdc)
TX Supply Current: 2.5 amps max
RX Supply Current: Operational—150 mA (nominal)

Fuse: 4 Amp Polyfuse, Self-Resetting, Internal

Reverse Polarity Protection: Diode across primary input

Standby (sleep)—18 mA

(Remove Primary Power to Reset)

ENVIRONMENTAL

Humidity: 95% at 40 degrees C
Temperature Range: –30 to 60 degrees C (full performance)

Weight: 1.6 kilograms
Case: Die-cast Aluminum

–40 to 70 degrees C (operational)

DIAGNOSTICS INTERFACE

Signaling Standard: EIA-232
Connector: RJ-11 (may use radio’s DB-25 instead if Pin 23 is

I/O Devices: MDS Hand Held Terminal or PC with MDS software

grounded to enable diagnostics channel)

7.2 Performing Network-Wide Remote Diagnostics

Diagnostics data from a remote radio can be obtained by connecting a
laptop or personal computer running MDS InSite diagnostics software
to any radio in the network.

34 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

Figure 12 shows an example of a setup for performing network-wide

remote diagnostics from both a Root (master station) location, and a
Node (remote station) location.

Invisible place holder

DIAGNOSTICS COMPUTER

RUNNING InSite

RTU

NODE

(Supports Intrusive

Diagnostics Only)

RTU

MASTER RADIO

PAYLOAD DATA

(To SCADA Application)

DIAGNOSTIC DATA

(To InSite)

RTU

ROOT

(Supports Intrusive or

Non-Intrusive Diagnostics)

HOST
COMPUTER

Figure 12. Network-Wide Remote Diagnostics Setup

If a PC is connected to any radio in the network, intrusive polling
(polling which briefly interrupts payload data transmission) can be per­formed. To perform diagnostics without interrupting payload data trans­mission, connect the PC to a radio defined as the “root” radio. A radio
is defined as a root radio using the

DTYPE ROOT command locally, at the

radio.
A complete explanation of remote diagnostics can be found in MDS’

Network-Wide Diagnostics System Handbook (MDS P/N
05-3467A01). See 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 configure the diagnostic link protocol on the RJ-11 port.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 35

3. Program all other radios in the network as nodes by entering the

DTYPE NODE command at each radio.

4. Use the

DLINK ON and DLINK [baud rate] commands to configure the

diagnostic link protocol on the RJ-11 port of each node radio.

5. Connect same-site radios using a null-modem cable at the radios’
diagnostic 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 diagnostic port. (This PC
may be the PC being used to collect payload data, as shown in

Figure 12.)

To connect a PC to the radio’s

DIAG. port, an RJ-11 to DB-9 adapter

(MDS P/N 03-3246A01) is required. If desired, an adapter cable
may be constructed from scratch using the information shown in

Figure 13.

Invisible place holder

DB-9 FEMALE

(TO COMPUTER)

RXD

2

TXD

3

GND

5

1

6

RJ-11 PIN LAYOUT

RJ-11 PLUG

(TO RADIO)

TXD

4

RXD

5

GND

6

Figure 13. RJ-11 to DB-9 Adapter Cable

7. Launch the MDS InSite application at the PC. (See the MDS InSite
User’s Guide for instructions.)

7.3 Bench Testing Setup

Figure 14 shows a sample test setup that can be used to verify the basic

operation of transceivers in a shop setting. The test can be performed
with any number of remote radios by using a power divider with the
required number of output connections.

The RTU simulator shown in the test setup (MDS Part No. 03-2512A01)
is a microcontroller that emulates a remote terminal unit operating at
1200, 2400, 4800, or 9600 bps. Custom software is supplied with the
RTU simulator that allows continuous polling of remote radios using an
IBM-compatible personal computer. The software reports the number of
polls sent, polls received, and the number of errors detected.

As an alternative to using an external RTU simulator, the transceiver’s
internal RTU simulator may be used (see

page 20). (This will not provide as conclusive a test as an external sim-

ulator because it does not utilize the transceiver’s data connector.)

RTU command in Table 7 on

36 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

NOTE: It is very important to use attenuation between all units in the

test setup. The amount of attenuation required will depend 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 greater than –50 dBm be applied to any transceiver in
the test setup.

Invisible place holder

COMPUTER RUNNING MDS

"POLL.EXE" PROGRAM

MASTER STATION

POWER ATTENUATORS

• Fixed or adjustable

• 5W Minimum Rating

REMOTE

TENNA
AN

8
.
13

VDC

+

–

* Transceiver's internal RTU Simulator may be used if

external simulator is unavailable. See text.

RTU SIMULATORS
MDS P/N 03-2512A01*

REMOTE

8

ANTENNA

.
3
1

VDC

+

–

POWER DIVIDER

NON-RADIATING ATTENUATOR

• Install on any unused divider ports

• 5W Minimum Rating

REMOTE

ANTENNA

8
.

13

VDC

–

+

REMOTE

ANTENNA

8

13.

VDC

–

+

Figure 14. Typical setup for bench testing of radios

7.4 Helical Filter Adjustment

If the operating frequency of the radio is changed significantly, the
helical filters should be adjusted for maximum received signal strength
(RSSI). To adjust the filters, proceed as follows:

1. Remove the top cover from the transceiver by loosening the four
screws and lifting straight up.

2. Locate the helical filters on the PC board. See Figure 15.

3. Apply a steady signal to the radio at the programmed receive fre­quency (–80 dBm level recommended; no stronger than –60 dBm).
This can be done with a signal generator or an over-the-air signal.

4. Measure the radio’s RSSI using one of the following methods:

• With an HHT (See Section 5.0, TRANSCEIVER PROGRAM-

MING on page 17).

• With MDS Radio Configuration Software (See Section 7.5,

Upgrading the Radio’s Software on page 38).

• With a voltmeter connected to Pin 21 of the
connector (See Section 4.2, RSSI Measurement on page 16).

DATA INTERFACE

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 37

5. With a non-metallic adjustment tool, adjust each section of the
helical filter for maximum RSSI. Re-install the cover to the trans­ceiver.

Invisible place holder

U104

U202

U101

FRONT PANEL

OF RADIO

J301

U203

HELICAL

ADJUSTMENTS

SHIELD
COVER

Figure 15. Helical Filter Location

7.5 Upgrading the Radio’s Software

From time to time, new product features or software maintenance files
may become available from MDS. This section describes the steps nec­essary to install new software into the transceiver using a PC connected
to the radio’s

DIAG. port.

Upgrade software can be obtained in a number of ways. The MDS Web
site at www.microwavedata.com contains an FTP area with software
files for several radio models. You can browse the listings to see if there
are files pertaining to your particular model. There is no charge for this
service.

In addition, you can also contact MDS to request radio software. Soft­ware files may be sent to you via e-mail, or on a 3.5” diskette. There may
be a nominal charge for the software depending on the nature of the
upgrade.

NOTE: Software upgrades are distributed as ASCII files with a “.S28”

extension. These files use the Motorola S-record format.

38 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

Using Radio Software Upgrade Diskette

A software upgrade diskette may be purchased from MDS to add new
product features to the radio such as Network-wide Diagnostics. The
upgrade kit includes a diskette (MDS P/N 06-3501A01) with the most
current radio software, authorization codes, and an instruction booklet.
Contact MDS for ordering information. When calling, please have the
serial number(s) available for the radio(s) that you wish to upgrade.

The upgrade software can be run on an IBM-compatible computer con­nected to the radio’s

DIAG. port via an RJ-11 to DB-9 adapter (MDS P/N

03-3246A01). If desired, an adapter cable may be constructed from
scratch using the information shown in Figure 13.

To initiate the upgrade, insert the upgrade diskette in Drive A:. Set the
working directory to
type

UPGRADE and press the ENTER key. (If you have the radio connected

via the Com2 serial port, type

A: (example: from a DOS prompt type A:\). Next,

UPGRADE-2 instead.) The upgrade soft-

ware will normally run automatically without any further prompts.
The radio’s

PWR LED will flash rapidly to confirm that a download is

in process. The download takes about two minutes.

NOTE: If a software download fails, the radio is left unprogrammed

and inoperative. This is indicated by the PWR LED flashing
slowly (1 second on, 1 second off). This condition is only
likely if a power failure occurred to the computer or radio
during the downloading process. The download can be
attempted again when the fault has been corrected.

Using Radio Configuration Software

If you already have software that you wish to download into the trans­ceiver, Radio Configuration Software (MDS P/N 03-3156A01) may be
used to perform the installation. To use this method, proceed as follows:

Connect a PC to the radio’s

DIAG. port via an RJ-11 to DB-9 adapter

(MDS P/N 03-3246A01). If desired, an adapter cable may be con­structed from scratch using the information shown in Figure 13.

Run the Radio Configuration software. Under the

RADIO SOFTWARE UPGRADE . Follow the prompts and online instructions

SYSTEM menu, select

to locate the desired software and complete the upgrade.
The radio’s

PWR LED will flash rapidly to confirm that a download is

in process. The download takes about two minutes.

MDS 05-3447A01, Rev. E MDS 1710A/C/F and MDS 2710A/C/D 39

NOTE: If a software download fails, the radio is left unprogrammed

and inoperative. This is indicated by the PWR LED flashing
slowly (1 second on, 1 second off). This condition is only
likely if a power failure occurred to the computer or radio
during the downloading process. The download can be
attempted again when the fault has been corrected.

7.6 dBm-Watts-Volts Conversion Chart

Table 9 is provided as a convenience for determining the equivalent

wattage or voltage of an RF power expressed in dBm.

Table 9. dBm-Watts-Volts Conversion—for 50 Ohm Systems

dBm V Po

+53 100.0 200W
+50 70.7 100W
+49 64.0 80W
+48 58.0 64W
+47 50.0 50W
+46 44.5 40W
+45 40.0 32W
+44 32.5 25W
+43 32.0 20W
+42 28.0 16W
+41 26.2 12.5W
+40 22.5 10W
+39 20.0 8W
+38 18.0 6.4W
+37 16.0 5W
+36 14.1 4W
+35 12.5 3.2W
+34 11.5 2.5W
+33 10.0 2W
+32 9.0 1.6W
+31 8.0 1.25W
+30 7.10 1.0W
+29 6.40 800mW
+28 5.80 640mW
+27 5.00 500mW
+26 4.45 400mW
+25 4.00 320mW
+24 3.55 250mW
+23 3.20 200mW
+22 2.80 160mW
+21 2.52 125mW
+20 2.25 100mW
+19 2.00 80mW
+18 1.80 64mW
+17 1.60 50mW
+16 1.41 40mW
+15 1.25 32mW
+14 1.15 25mW
+13 1.00 20mW
+12 .90 16mW
+11 .80 12.5mW
+10 .71 10mW
+9 .64 8mW
+8 .58 6.4mW
+7 .500 5mW
+6 .445 4mW
+5 .400 3.2mW
+4 .355 2.5mW
+3 .320 2.0mW
+2 .280 1.6mW
+1 .252 1.25mW

dBm V Po

0 .225 1.0mW

-1 .200 .80mW

-2 .180 .64mW

-3 .160 .50mW

-4 .141 .40mW

-5 .125 .32mW

-6 .115 .25mW

-7 .100 .20mW

-8 .090 .16mW

-9 .080 .125mW

-10 .071 .10mW

-11 .064

-12 .058

-13 .050

-14 .045

-15 .040

-16 .0355

dBm mV Po

-17 31.5

-18 28.5

-19 25.1

-20 22.5 .01mW

-21 20.0

-22 17.9

-23 15.9

-24 14.1

-25 12.8

-26 11.5

-27 10.0

-28 8.9

-29 8.0

-30 7.1 .001mW

-31 6.25

-32 5.8

-33 5.0

-34 4.5

-35 4.0

-36 3.5

-37 3.2

-38 2.85

-39 2.5

-40 2.25 .1µW

-41 2.0

-42 1.8

-43 1.6

-44 1.4

-45 1.25

-46 1.18

-47 1.00

-48 0.90

dBm mV Po

-49 0.80

-50 0.71 .01µW

-51 0.64

-52 0.57

-53 0.50

-54 0.45

-55 0.40

-56 0.351

-57 0.32

-58 0.286

-59 0.251

-60 0.225 .001µW

-61 0.200

-62 0.180

-63 0.160

-64 0.141

dBm µV Po

-65 128

-66 115

-67 100

-68 90

-69 80

-70 71 .1nW

-71 65

-72 58

-73 50

-74 45

-75 40

-76 35

-77 32

-78 29

-79 25

-80 22.5 .01nW

-81 20.0

-82 18.0

-83 16.0

-84 11.1

-85 12.9

-86 11.5

-87 10.0

-88 9.0

-89 8.0

-90 7.1 .001nW

-91 6.1

-92 5.75

-93 5.0

-94 4.5

-95 4.0

-96 3.51

-97 3.2

dBm µV Po

-98 2.9

-99 2.51

-100 2.25 .1pW

-101 2.0

-102 1.8

-103 1.6

-104 1.41

-105 1.27

-106 1.18

dBm nV Po

-107 1000

-108 900

-109 800

-110 710 .01pW

-111 640

-112 580

-113 500

-114 450

-115 400

-116 355

-117 325

-118 285

-119 251

-120 225 .001pW

-121 200

-122 180

-123 160

-124 141

-125 128

-126 117

-127 100

-128 90

-129 80 .1ƒW

-130 71

-131 61

-132 58

-133 50

-134 45

-135 40

-136 35

-137 33

-138 29

-139 25

-140 23 .01ƒW

40 MDS 1710A/C/F and MDS 2710A/C/D MDS 05-3447A01, Rev. E

INDEX

A

ACCESS DENIED error message 20
Accessories 5
Accessory Power pinout (Pin 18) 14
Active messaging (defined) 5
Alarms

alarm code definitions
major vs. minor 31
pinout (Pin 25) 15
using STAT command to display 29

AMASK command 22
Antenna

installation
RSSI command used to refine heading 15
system gain, defined 6
Yagi, illustrated 12

Antennas 11–12
Applications 2

Multiple Address Systems (MAS) 2
point-to-multipoint system 2
point-to-point system 3

ASENSE command 23

9

32

B

BAUD command 23
Baud rate

setting for RJ-11 DIAG port (DLINK command)

Bench testing (radio performance), 36–37
Bit, defined 6
Bits-per-second. See BPS
BPS (bits-per-second), defined
BUFF command 23
Byte, defined 6

6

25, 35

DATAKEY (enable/disable transmitter keying by radio) 24
DEVICE (set/display radio behavior) 24
DKEY (deactivate transmitter after KEY command) 25
DLINK (enable/disable network-wide diagnostics) 25
DMGAP (set time to wait between characters) 25
DTYPE (set radio to Root or Node for diagnostics) 25
DUMP (display all programmed settings) 26
entering on Hand-Held Terminal (HHT) 19
Hand-Held Terminal (HHT) 19
HREV (display hardware revision level) 26
INIT (reinitialize radio to factory defaults) 26
INIT xx10 (restore standard transceiver defaults) 26
INIT xx20 (configure radio for use with P-20 chassis) 26
KEY (activate transmitter) 27
MODEL (display radio model number code) 27
MODEM (set modem speed) 27
OWM (set/display owner’s message) 27
OWN (set/display owner’s name) 27
PTT (set/display key-up delay) 27
PWR (set/display RF forward output power) 27
RSSI (display RSSI) 28
RTU (enable/disable internal RTU) 28
RX (set/display receive frequency) 28
RXTOT (set/display receive time-out timer value) 28
SCD (set/display soft-carrier dekey delay) 28
SER (display radio serial number 28
SHOW (display DC voltage, data port, RF power) 29
SNR (display signal-to-noise ratio) 29
SREV (display software revision level) 29
STAT (display current alarm status) 29
TEMP (display internal temperature) 29
TOT (set/display time-out value and timer status) 30
TX (set/display transmit frequency) 30

Conversions, dBm-Watts-Volts 40
CTS command 24
CTS pinout (Pin 5) 14

C

Cable, loss due to length of coaxial 12
Cautions

use attenuation between all units in test setup

CKEY command 24
COMMAND FAILED error message 20
Command summary, table 20
Commands

AMASK (set/display alarm triggers)
ASENSE (set alarm output state) 23
BAUD (set/display rate, encoding) 23
BUFF (set/display data handling mode) 23
CKEY (enable/disable continuous keying) 24
CTS (set/display CTS line response timer) 24

22

35

D

Data interface

connector pinouts
display active connector port 29
installing connection 13

DATAKEY command 24
dB. See Decibel 6
dBi, defined 6
dBm, defined 6
DCD

LED

16

pinout (Pin 8) 14

DCE (Data Cirtuit-terminating Equipment), defined 6
Decibel (dB), defined 6

14

MDS 05-3447A01, Rev. D MDS 1710A/C/F and MDS2710A/C/D I-1

Description, product 1
Detailed 22
DEVICE command 24
Diagnostic Channel Enable, pinout (Pin 23) 15
Diagnostics

interface specifications 34
network-wide, performing 34
PC software used for 38
using InSite software for network-wide 34

Differences between models 2
Display

alarm status (STAT command)
alarm triggers (AMASK command) 22
all programmed settings (DUMP command) 26
baud rate and encoding (BAUD command) 23
connector port, active (SHOW command) 29
CTS line response timer (CTS command) 24
data handling mode (BUFF command) 23
DC voltage (SHOW command) 29
hardware revision leve (HREV command)l 26
key-up delay (PTT command) 27
model number code (MODEL command) 27
owner’s message (OWM command) 27
owner’s name (OWN command) 27
radio behavior (DEVICE command) 24
radio serial number (SER command) 28
receive frequency (RX command) 28
receive time-out timer value (RXTOT command) 28
RF forward output power (PWR command) 27
RF output (SHOW command) 29
RSSI (RSSI command) 28
signal-to-noise ratio (SNR command) 29
soft-carrier dekey delay (SCD command) 28
software revision level (SREV command) 29
temperature, internal (TEMP command) 29
time-out value and timer status (TOT command) 30
transmit frequency (TX command) 30

DKEY command 25
DLINK command 25

use of 35

DMGAP command 25
Downloading new software 38
DSP (Digital Signal Processing), defined 6
DSR pinout (Pin 6) 14
DTE (Data Terminal Equipment), defined 6
DTYPE command 25

use of 35

DUMP command 26

29

E

Equalization, defined 6
Error messages 19

access denied 20
command failed 20
EEPROM failure 20
incorrect entry 19
not available 20
not programmed 20
text too long 20
unknown command 19

F

Fade margin, defined 7
Feedlines 12
Filter, helical, adjustment 37
Frame, defined 7
Frequency

adjusting helical filter when changed
setting. See TX and RX commands

37

G

Glossary 5
Ground

on Pin 12 to enable Sleep mode
protective (Pin 1) 14
signal (Pin 7) 14

14

H

Half-duplex 3

switched carrier operation 4

Hand-Held T erminal (HHT) 5

connected to transceiver, illustrated 18
connection and startup 17
display in response to STAT command, illustrated 31
entering commands 19
error messages displayed on 19
keyboard commands 19
operational settings, table 19
reinitialization display, illustrated 18
reinitializing 18

Hardware flow control, defined 7
Helical filter

adjusting
illustration 38

Host computer, defined 7
HREV command 26

37

EEPROM FAILURE error message 20
Enable/disable

continuous keying (CKEY command)
diagnostic channel, pinout (Pin 23) 15
internal RTU (RTU command) 28
network-wide diagnostics (DLINK command) 25
network-wide diagnostics, procedures 35

Environment specifications 34

24

I

Illustrations

antenna, Y agi 12
Hand-Held Terminal (HHT) connected to transceiver 18
Hand-Held Terminal (HHT) reinitialization display 18
Hand-Held Terminal display in response to STAT command 31
helical filter locations 38

I-2 MDS 1710A/C/F and MDS2710A/C/D MDS 05-3447A01, Rev. D

MAS network 3
MDS 2710A/D model number codes 4
network-wide diagnostics 35
point-to-point link 3
remote station arrangement 9
RJ-11 to DB-9 adapter cable 36
RSSI vs. Vdc 13, 16
transceiver connectors & indicators 1
transceiver mounting dimensions 11

INCORRECT ENTRY error message 19
INIT command 26
INIT xx10 command 26
INIT xx20 command 26
InSite software

using to perform remote diagnostics 34

Installation 8–15

antenna 9
configuring transceiver 10
DATA INTERFACE connection 9
data interface connections 13
power 9
power connection 12
steps 9

Intrusive diagnostics (defined) 7

K

KEY command 27
Keying

continuously keyed versus switched carrier operation 4
continuously keyed, defined 4
on data (DKEY command) 25
switched carrier, defined 4

displaying (MODEL command)
MDS 2710A/D, illustrated 4

MODEM command 27
Modem, set speed. See MODEM command

27

N

Network-wide diagnostics

active messaging, defined
defined 7
enable/disable (DLINK command) 25
enable/disable internal RTU (RTU command) 28
illustrated 35
intrusive diagnostics, defined 7
passive messaging (defined) 7
procedures 34
set radio to Root or Node (DTYPE command) 25
set time to wait between characters (DMGAP command) 25

NOT AVAILABLE error message 20
NOT PROGRAMMED error message 20

5

O

Operation 15–16

environment, specifications for 34

Output, 9.9 Vdc regulated, pinout (Pin 19) 15
OWM command 27
OWN command 27
Owner’s message, set/display. See OWM command
Owner’s name, set/display. See OWN command

P

L

Latency, defined 7
LEDs

DCD

16

indicators, described 16
PWR 16
RXD 16
RXD, Pin 3 14
status indicators, illustrated 16
TXD 16
TXD, Pin 2 14

Loss. See Signal

M

MAS (Multiple Address System) 2

defined 7
illustration 3

Master Station

defined 7
keying behavior 4

MCU (Microcontroller Unit), defined 7
MODEL command 27
Model number codes

Passive messaging (defined) 7
Payload data (defined) 8
Performance

testing,

36–37

Pinouts on data interface 14
PLC (Programmable Logic Controller), defined 8
Point-to-multipoint

defined

8

system 2

Point-to-point

link, illustrated
system 3

Poll, defined 8
Power

connection
display DC voltage (SHOW command) 29
display RF output (SHOW command) 29
installing 9
LED status indicator (PWR LED) 16
RF, chart for converting dBm-Watts-Volts 40
specifications 34

Power attenuators, use of in testing 37
Procedures

checking for alarms (STAT command)
connecting Hand-Held Terminal (HHT) 17
downloading new software 38

3

12

31

MDS 05-3447A01, Rev. D MDS 1710A/C/F and MDS2710A/C/D I-3

entering commands using the Hand-Held Terminal (HHT) 19
helical filter adjustment 37
installation 9
measuring RSSI with DC voltmeter 16
network-wide diagnostics 34
operation 15, 16
performance optimization 15
reading LED status indicators 16
resetting Hand-Held Terminal (HHT) 18
troubleshooting 30–32

Product

accessories 5
description 1
display model number code (MODEL command) 27
display radio serial number (SER command) 28

Programming radio as root or node 35
Programming, transceiver 17–20
PTT

command
pinout (Pins 14, 16) 14

PWR

command 27
LED 16

27

R

Radio

Configuration Software 5, 38
Inhibit pinout (Pin 12) 14
serial number, displaying (SER command) 28

Receive Audio Output pinout (Pin 11) 14
Receiver

specifications
system specifications 33
unsquelched signal (Pin 10) 14

Redundant operation, defined 8
Remote

RTU reset (Pin 15) 14
Station, defined 8
Station, illustrated 9

Resetting

Hand-Held Terminal (HHT) (SHIFT,CTRL,SPACE keys)
remote RTU reset (Pin 15) 14
transceiver (INIT command) 26

Revision level

display hardware (HREV command) 26
display software (SREV command) 29

RSSI

adjusting helical filter for increased signal strength
command 28
command, used to refine antenna heading 15
measuring 16
pinout (Pin 21) 15
vs. Vdc, illustrated 13, 16

RTS pinout (Pin 4) 14
RTU

command 28

RTU (Remote Terminal Unit)

defined 8
remote reset (Pin 15) 14

34

37

18

RTU simulator, 36
RUS pinout (Pin10) 14
RX command 28
RXD LED

description 16
Pin 3 14

RXTOT command 28

S

SCADA (Supervisory Control And Data Acquisition), defined 8
SCD command 28
SER command 28
Set

alarm output state (ASENSE command) 23
alarm triggers (AMASK command) 22
receive time-out timer value (RXTOT command) 28

SHOW command 29
Signal

ground (Pin 7) 14
loss due to coaxial cable length, table 12

Simplex 3

single-frequency operation 4
special case of switched carrier operation 4

Sleep mode

example implementation 13
ground on Radio Inhibit pin activates 14
Pin 12 14
shown by PWR LED status indicator 16

SNR command 29
Software

diagnostics and control used from PC 38
display revision level 29
upgrades (.S28 files) 38
upgrading 38
used for diagnostics and programming 17

Specifications

diagnostics interface 34
environment 34
power 34
receiver 34
receiver system 33
transceiver 33–34
transmitter 33
transmitter system 33

SREV command 29
STAT command 29
SWR (Standing Wave Radio), defined 8

T

Tables

accessories 5
alarm code definitions 32
command summary 20
conversions, dBm-Watts-Volts 40
data interface connector pinouts 14
Hand-Held Terminal (HHT) operational settings 19
LED status indicators 16

I-4 MDS 1710A/C/F and MDS2710A/C/D MDS 05-3447A01, Rev. D

length vs. loss in coaxial cables 12

Technical reference 33–40
Technical reference,

codes

36–37

20

2

33

17

16

bench test setup,

TEMP command 29
Temperature, displaying internal (TEMP command) 29
Testing. See bench testing
TEXT TOO LONG error message
Timer, set/display time-out value and status (TOT command) 30
TOT command 30
Transceiver

applications
configuring for operation 10
connectors and indicators, illustrated 1
diagnostics using PC software 38
dimensions, mounting 11
mounting 9, 11
programming 17–20
specifications 33–34
upgrading software 38

Transmit Audio Input pinout (Pin 9) 14
Transmitter

specifications
system specifications 33

Troubleshooting 30–32

connecting Hand-Held Terminal (HHT) for displaying alarm

performing network-wide diagnostics 34
STAT command (Status) 31
using PC software for 38

TX command 30
TXD LED

description
Pin 2 14

U

UNKNOWN COMMAND error message 19

I-5 MDS 1710A/C/F and MDS2710A/C/D MDS 05-3447A01, Rev. D

NOTES

I-6 MDS 1710A/C/F and MDS2710A/C/D MDS 05-3447A01, Rev. D

IN CASE OF DIFFICULTY...

MDS products are designed for long life and
trouble-free operation. However, this equip­ment, as with all electronic equipment may
have an occasional component failure. The
following information will assist you in the
event that servicing becomes necessary.

F ACT ORY TECHNICAL
ASSISTANCE

Technical assistance for MDS products is
available from our Customer Support Team
during business hours (8:00 A.M.–5:30 P.M.
Eastern Time). When calling, please give the
complete model number of the radio, along
with a description of the trouble symptom(s)
that you are experiencing. In many cases, prob­lems can be resolved over the telephone,
without the need for returning the unit to the
factory.

Please use one of the following means for
product assistance:

the outside of the shipping box, and on any
correspondence relating to the repair. No

equipment will be accepted for repair without
an SRO number.

A statement should accompany the radio
describing, in detail, the trouble symptom(s),
and a description of any associated equipment
normally connected to the radio. It is also
important to include the name and telephone
number of a person in your organization who
can be contacted if additional information is
required.

The radio must be properly packed for return
to the factory. The original shipping container
and packaging materials should be used when­ever possible. All factory returns should be
addressed to:

Microwave Data Systems Inc.
Product Service Department
(SRO No. XXXX)
175 Science Parkway
Rochester, NY 14620 USA

Phone: [phone]
E-mail: [e-mail]
Web: www.microwavedata.com
FAX: [phone]

FACTORY REPAIRS

Component-level repair of radio equipment is
not recommended in the field. Many compo-

nents are installed using surface mount tech­nology, which requires specialized training
and equipment for proper servicing. For this
reason, the equipment should be returned to
the factory for any PC board repairs. The
factory is best equipped to diagnose, repair and
align your radio to its proper operating specifi­cations.

If return of the equipment is necessary, you
will be issued a Service Return Order (SRO)
number. The SRO number will help expedite
the repair so that the equipment can be repaired
and returned to you as quickly as possible.
Please be sure to include the SRO number on

When repairs have been completed, the equip­ment will be returned to you by the same ship­ping method used to send it to the factory.
Please specify if you wish to make different
shipping arrangements.

Microwave Data Systems Inc.

175 Science Parkway
Rochester, NY 14620

General Business: [phone]

FAX: [phone]

Web: www.microwavedata.com

A product of Microwave Data Systems Inc.