User Manual
Integration Guide
216–235 MHz Data Transceivers
TRM SB OEM Series
MDS 05-4121A03, Rev. A
MAY 2012
MDS 05-4121A03, Rev. A TRM SB Integration Guide i
TABLE OF CONTENTS
1.0 INTRODUCTION ......................................................................... 7
1.1 Modem Speed versus Channel Bandwidth ......................................8
1.2 Frequency Coverage ........................................................................8
1.3 Radio Operating Modes ...................................................................8
Single Frequency (Simplex) Operation ............................................... 8
Switched-Carrier Operation (Half-Duplex) ..........................................8
Receive Only Operation......................................................................9
1.4 Applications ......................................................................................9
Point-to-Multipoint, Multiple Address Systems (MAS) ........................9
Point-to-Point System .......................................................................10
1.5 Model Number Codes ....................................................................11
2.0 INSTALLATION DESIGN ........................................................... 12
2.1 Mounting the Transceiver ............................................................... 13
2.2 Interface Requirements ..................................................................13
2.3 Antennas and Feedlines ................................................................14
Antennas ..........................................................................................14
Feedlines ..........................................................................................15
2.4 Primary Power (3.6 Vdc) ................................................................15
DC Supply Connection .....................................................................15
Shutdown Mode (Energy Conservation)...........................................16
2.5 Data Interface Connections ............................................................16
3.0 TRANSCEIVER CONFIGURATION AND DIAGNOSTIC
COMMANDS ..................................................................................... 19
3.1 Error Messages ..............................................................................21
3.2 Initial Installation—Radio and Data Configuration ..........................22
4.0 TROUBLESHOOTING ............................................................... 23
5.0 TECHNICAL REFERENCE ....................................................... 24
5.1 Transceiver Specifications ..............................................................24
5.2 Test and Evaluation Assembly .......................................................25
5.3 Vendors for Connectors ..................................................................28
5.4 dBm-Watts-Volts Conversion Chart ................................................ 29
6.0 GLOSSARY OF TERMS............................................................ 30
ii TRM SB Integration Guide MDS 05-4121A03, Rev. A
Copyright Notice
This Installation and Operation Guide and all software described herein
are protected by
copyright: 2012 GE MDS
.
All rights reserved.
GE MDS reserves its right to correct any errors and omissions in this
publication.
Antenna Installation Warning
1. All antenna installation and servicing is to be performed by
qualified technical personnel
only. When servicing the antenna, or
working at distances closer than those listed below,
ensure the
transmitter has been disabled.
2. The radio equipment described in this guide emits radio frequency
energy. Although the power level is low, the concentrated energy
from a directional antenna may pose a health hazard. Do not allow
people to come closer than 1.4 meters to the front of the antenna
when the transmitter is operating with a 11.85 dBd (14 dBi) gain
antenna. Use of higher gain antennas means increasing the distance
accordingly. This guide is intended for use by a professional
installer.
L'équipement radio décrite dans ce guide émet de l'énergie de
fréquence radio. Bien que le niveau de puissance est faible, l'énergie
concentrée à partir d'une antenne directionnelle peut poser un
danger pour la santé. Ne pas permettre aux gens de se rapprocher de
1.4 mètres à l'avant de l'antenne lorsque l'émetteur est oper-tionne-
ment avec un dBd 11.85 (14 dBi) gain d'antenne. L'utilisation
d'antennes à gain plus élevé signifie qu'il faut augmenter la distance
en conséquence. Ce guide est destiné à être utilisé par un installateur
professionnel.
ISO 9001 Registration
GE MDS adheres to this internationally accepted quality system stan-
dard.
RF Exposure
Separation distance
required for
RF exposure complianc
e
MDS 05-4121A03, Rev. A TRM SB Integration Guide iii
Quality Policy Statement
We, the employees of GE MDS, are committed to understanding and
exceeding our customer’s needs and expectations.
• We appreciate our customer’s patronage. They are our business.
• We promise to serve them and anticipate their needs.
• We are committed to providing solutions that are cost effective,
innovative and reliable, with consistently high levels of quality.
• We are committed to the continuous improvement of all of our
systems and processes, to improve product quality and increase
customer satisfaction.
ESD Notice
To prevent malfunction or damage to this product, which may be caused
by Electrostatic Discharge (ESD), the radio should be properly
grounded at the time of installation. In addition, the installer or main-
tainer should follow proper ESD precautions, such as touching a bare
metal object to dissipate body charge, prior to touching components or
connecting/disconnecting cables.
Manual Revision and Accuracy
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 addi-
tional questions or need an exact specification for a product, please con-
tact our Customer Service Team using the information at the back of this
guide. In addition, manual updates can often be found online at
www.gemds.com.
FCC Part 15 Notice
This equipment has been tested and found to comply with the limits for
a Class B digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to
radio communications. However, there is no guarantee that interference
iv TRM SB Integration Guide MDS 05-4121A03, Rev. A
will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be deter-
mined by turning the equipment off and on, the user is encouraged to try
and correct the interference by one or more of the following measures:
• Reorient or locate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for
help.
This Class B digital apparatus complies with Canadian ICES-003. Cet
appareil numérique de la classe B est conforme à la norme NMB-003 du
Canada.
Operation is subject to the following two conditions: (1) this device may
not cause interference, and (2) this device must accept any interference,
including interference that may cause undesired operation of the device.
Changes or modifications not expressly approved by the party respon-
sible for compliance could void the user's authority to operate the equip-
ment.
MDS 05-4121A03, Rev. A TRM SB Integration Guide 1
1.0 INTRODUCTION
This guide presents installation and operating instructions for the
TRM SB digital radio transceiver. The radio is a compact, modular
board well suited to user-designed customer integration with remote
terminal units (RTUs), programmable logic controllers (PLCs),
automatic banking machines, or similar equipment.
The transceiver (Figure 1) is a data telemetry radio 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. The radio employs
microprocessor control to provide highly reliable communications, even
under adverse conditions.
TRM SB radios use Gaussian-mean shift keying (GMSK) modulation.
Invisible place holder
Figure 1. TRM SB Data Transceiver
2 TRM SB Integration Guide MDS 05-4121A03, Rev. A
1.1 Modem Speed versus Channel Bandwidth
The transceiver may be configured by the user to one of two
arrangements dependent on the permissible values of over-the-air data
baud rate (
BAUD
), Gaussian filtering (
BT
), and channel bandwidth (
BW
).
The valid configurations are:
The current configuration will be displayed by the
MODEM
command.
These parameters are independent of any other user-controllable
operating parameter.
1.2 Frequency Coverage
The radio is available for operation between 216.025 and 235.000 MHz.
Any combination of transmit and receive frequencies can be
programmed within this range, including a simplex (TX = RX) pair. It
is suggested not to operate the system exactly at 232.000 MHz due to the
reference clock effects on the receiver. While the unit is completely
functional even in this region, it is suggested not to use the unit at
232.000 MHz +/- 25 kHz to ensure maximum receiver sensitivity.
1.3 Radio Operating Modes
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.
Switched-Carrier Operation (Half-Duplex)
Switched-carrier operation is a half-duplex mode where the master
station transmitter is keyed to send data and unkeyed to receive. The
transceiver operates in switched-carrier mode and is keyed when data is
present.
NOTE:
The transceiver does not support full-duplex operation (i.e.,
transmitting and receiving at the same time). For information
on other products that provide this capability, contact your
sales representative.
Table 1. Permissible Data Configurations
Baud (bps)
Receive
Bandwidth
(BW) BT
19200 25.0 kHz .3
9600 25.0 kHz .5
MDS 05-4121A03, Rev. A TRM SB Integration Guide 3
Receive Only Operation
The transceiver is available as a receive-only module. The operation is
identical to the tranceiver model, except that the transmit functions are
disabled.
1.4 Applications
Point-to-Multipoint, Multiple Address Systems (MAS)
Point-to-multipoint (MAS) 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. That is, the radio
system transports the data in its original form, making no changes to the
data format.
Often, the radio system is used to replace a network of remote monitors
currently linked to a central location by leased telephone lines. 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 telephone line is quite high, radio is frequently
used as an alternative communication medium.
4 TRM SB Integration Guide MDS 05-4121A03, Rev. A
Invisible place holder
Figure 2. MAS Point-to-Multipoint Network
(Two remote stations shown—four or more are typically used)
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.
Invisible place holder
Figure 3. Typical Point-to-Point Link
radio
HOST
COMPUTER
MASTER
STATION
RTU
radio
REMOTE
RTU
radio
REMOTE
radio
HOST
COMPUTER
MASTER
STATION
RTU
radio
REMOTE
MDS 05-4121A03, Rev. A TRM SB Integration Guide 5
1.5 Model Number Codes
The radio model number is printed on the PC board or on the radio
enclosure, and provides key information about how the radio was
configured when was shipped from the factory. Contact GE MDS
Technical Services if you have questions about the model number
codes.
6 TRM SB Integration Guide MDS 05-4121A03, Rev. A
2.0 INSTALLATION DESIGN
The TRM SB transceiver is designed to be part of a larger electronic
device or system. It must be provided with adequate and stable primary
power, a complementary data interface and RF antenna system
connections. An appropriate antenna is the only external device that is
needed.
Connections to the TRM SB are through two connections: data and
power through an AVX Series 5046 fine-pitch (
DATA INTERFACE)
connector and RF signalling through PCB pads to a SMT PCB-to-PCB
pressure-contact coaxial connector. These connections require a stable
support for the TRM SB module with positive pressure by the RF
connector on the RF I/O pads (J300/301). Figure 4 shows the external
connections for the transceiver.
Invisible place holder
Figure 4. Transceiver Views Showing External Connections
The transceiver has all of its electronic circuitry enclosed in the RF
shields to minimize interaction with nearby electronic products. The
transceiver module is compliant with FCC Part 15, FCC Part 80 in the
216-220 MHz band, and FCC Part 90 in the 220 to 222 MHz band. The
transmitter is typically configured for a nominal 3.6VDC operating
voltage to produce 0.5 Watts on Low Power and 1 Watt on High Power.
Careful selection and/or design of the radio transmission line is
important to minimizing RFI to nearby electronic devices.
This unit must be provided with a good antenna system optimal
communication range and reliability. A secondary benefit is an
opportunity to run the system at the lowest possible power level, a lower
primary power consumption, and reduced chances of interference.
MDS 05-4121A03, Rev. A TRM SB Integration Guide 7
The data interface will support a variety of system designs. Use only the
required pins for the application.
Refer to the complete list of pin
functions in Table 4 on Page 11.
2.1 Mounting the Transceiver
Figure 5 shows the mounting dimensions of the transceiver PC board.
The board should be secured to the mounting surface using the holes
provided at each corner of the assembly. (Fasteners are not supplied.)
Invisible place holder
Figure 5. Transceiver Mounting Dimensions
2.2 Interface Requirements
It is highly desirable to provide for electronic access to the TRM SB
module after it is installed in your product or system. This allows for
module configuration and control, frequency changes when needed,
antenna system optimization, and diagnostic activities.
In addition, it would be beneficial to provide field service personnel a
technique for directly monitoring the test and diagnostic indicators
produced by the unit to indicate the incoming radio signal strength
(RSSI), and the radio synthesizer’s unfiltered out-of-lock indicator.
.140
0.000
0.000
2.47
2.61
.140
1.555
1.695
2.750
1.835
2.33
.140
Data
Connector
.090" .090"
.050"
.050"
.010
.775
2.465
1.110
.090
.050
8 TRM SB Integration Guide MDS 05-4121A03, Rev. A
Table 2 summarizes minimal recommended access requirements for
field setup and servicing of the TRM SB radio transceiver. Other
interface signal functions may be of use to field service personnel or as
part of a diagnostic design for the whole user-defined package.
2.3 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. Suitable
antennas are available from several manufacturers, including GE MDS.
At master stations, omni-directional antennas (Figure 6) are typically
used to provide equal coverage to all remote sites in the network.
Invisible place holder
Figure 6. Typical Omni-directional Antenna for Master Stations
(Shown mounted to mast)
Table 2. Configuration and Evaluation Signals
Function
Data
Interface
Pin Signal Type
)
Description
Enable Configuration 11 Low = Enabled Enables terminal
interaction with module.
Disables payload
throughput.
Received (RF) Signal
Strength Signal
Indicator—RSSI
12 Analog
0–3 Vdc
Aid to aiming antenna
system and determining
presence of radio signals
Synthesizer Lock 2 H = Locked
L = Out-of-Lock
Unprocessed indicator of
state of transceiver’s
frequency synthesizer.
Signal may contain
inconsequential transients
MDS 05-4121A03, Rev. A TRM SB Integration Guide 9
At remote sites, a directional Yagi (Figure 7) or corner reflector antenna
is generally recommended to minimize interference to and from other
users.
Invisible place holder
Figure 7. Typical Yagi Antenna for Remote Sites
Feedlines
The selection of antenna feedline is very important. Poor quality cables
should be avoided as they result in power losses that may reduce the
range and reliability of the radio system.
Table 3 shows the losses that occur when using various lengths and
types of cable at 200 MHz. Regardless of the type of cable used, it
should be kept as short as possible to minimize signal loss.
2.4 Primary Power (3.6 Vdc)
DC Supply Connection
The transceiver can be operated from any well-filtered 3.6 Vdc power
source through the
DATA INTERFACE
connector. The power supply must
be capable of providing at least 1.5 Amperes and provide current
limiting even if you intend to operate the radio at low power (0.5 Watts).
NOTE: The radio is designed for use in
negative
ground systems only.
There is no fuse or reverse polarity protection provided on the
transceiver’s PCB assembly.
Table 3. Length vs. Loss in Coaxial Cables at 200 MHz
Cable Type
10 Feet
(3.05 Meters)
50 Feet
(15.24 Meters)
100 Feet
(30.48 Meters)
500 Feet
(152.4 Meters)
RG-8A/U 0.28dB 1.4 dB 2.8 dB 14.0 dB
1/2 inch HELIAX
0.10 dB 0.48 dB 0.95 dB 4.75 dB
7/8 inch HELIAX
0.05 dB 0.25 dB 0.49 dB 2.43 dB
1-1/4 inch HELIAX
0.04 dB 0.18 dB 0.36 dB 1.81 dB
1-5/8 inch HELIAX
0.03 dB 0.15 dB 0.30 dB 1.49 dB
CAUTION
POSSIBLE
EQUIPMENT
DAMAGE
10 TRM SB Integration Guide MDS 05-4121A03, Rev. A
The positive (+) DC power must be provided through pins 23, 24, 25,
26, 27,and 28. The data signal and DC power current return (–) should
be connected to pins 1, 7, 9, 19, 20, 21, 22, and 30. (See Figure 4 on
Page 6 for details.) All power pins should be used to provide sufficient
current capacity in transmit operation.
Shutdown Mode (Energy Conservation)
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 by configuring the data device (RTU, PLC,
etc.) to ground the DATA INTERFACE connector Pin 29 to power-down
the radio until communication to other devices is needed. All radio and
microprocessor activity is disabled when the radio is in the shutdown
mode. When the ground is removed from Pin 29, the radio is ready to
operate in approximately 250 milliseconds.
2.5 Data Interface Connections
The transceiver’s DATA INTERFACE connector is configured as a DCE
(modem) and supports over-the-air asynchronous data rates of 9600 and
19200 bps. The DATA INTERFACE is normally connected to a
device/circuit with a TTL interface. Refer to Figure 8 and Table 4 for a
detailed description of each pin on the DATA INTERFACE connector.
Some pins on the DATA INTERFACE connector are used for factory
testing. Use only the required pins for the application. Damage may
result if improper connections are made.
CAUTION
USE ONLY
REQUIRED PINS
MDS 05-4121A03, Rev. A TRM SB Integration Guide 11
Invisible place holder
Figure 8. Data Interface Connector
(As viewed from above)
Table 4. DATA INTERFACE Connector Pinouts
Pin
Number
Input/
Output Pin Description
1 IN/OUT Ground
2 OUT RF synthesizer lock detect signal
• High = locked (Radio ready for service)
• Low = Out-of-lock (Radio disabled)
• Raw / “unfiltered”
3INTX Data—Transmit Data (payload) in normal operation
4 OUT CD—Carrier Detect
• Low whenever RSSI exceeds the programmed CDR
threshold.
• Detects RF activity on the radio channel regarless of the
signals modulation type or data protocol.
5 IN/OUT Ground (Power and signal)
6 OUT RX Clock—Always applicable when receiving
• Goes from low to high at the center of each RX Data bit
(receive mode). Data will be valid on falling edge.
• Provided when transmitting if “CLK RX” is programmed
• Goes from low to high to request each new TXD bit. Data
must be valid on falling edge.
• Continuously high when transceiver is in Configuration
Mode (J100, Pin 11 = Low)
7 IN/OUT Ground (Power and signal)
8 OUT TX Clock—Transmit Data Clock
• Only applicable when “CLK TX” is programmed and TX
ON is asserted
• Clock goes from low to high to request each new TXD bit.
Data must be valid on falling edge.
• Continuously high when in Configuration Mode (J100,
Pin 11 = Low), or when “CLK RX” is selected
12 TRM SB Integration Guide MDS 05-4121A03, Rev. A
9 IN/OUT Ground (Power and signal)
10 Do not connect—Reserved for factory use only.
11 IN CONFIG—Configure Radio
• High puts radio in normal payload mode to receive or
transmit data at the programmed rate
• Low puts radio in setup mode to communicate with the
processor at 38.4 kbps asynchronously
12 OUT RSSI—Receive Signal Strength Indicator
• Analog voltage between 0 and 3 Vdc proportional to
signal strength on the channel
13 IN TX ON—Request to key radio transmitter
• High puts radio in receive mode
• Low puts radio in transmit mode
14 OUT RX Data—Receive Data
• Receive data (off-the-air) in normal operation
• Control data from the processor in setup mode
15 OUT RX Audio—Filtered receive audio
• For test purposes only
16 Do not connect—Reserved for factory use only.
17 Not used – Do not connect
18 Vcc—Regulated +3.6 Vdc power for the transceiver
19 IN/OUT Ground (Power and signal)
20 IN/OUT Ground (Power and signal)
21 IN/OUT Ground (Power and signal)
22 IN/OUT Ground (Power and signal)
23 IN Vcc—Regulated +3.6 Vdc power for the transceiver*
24 IN Vcc—Regulated +3.6 Vdc power for the transceiver*
25 IN Vcc—Regulated +3.6 Vdc power for the transceiver*
26 IN Vcc—Regulated +3.6 Vdc power for the transceiver*
27 IN Vcc—Regulated +3.6 Vdc power for the transceiver*
28 IN Vcc—Regulated +3.6 Vdc power for the transceiver*
29 IN Shutdown Mode
• Low puts radio in low-power shutdown
• High or open allows normal operation
30 IN/OUT Ground (Power and signal)
* All Vcc pins should be used to provide sufficient current capacity in transmit mode.
Table 4. DATA INTERFACE Connector Pinouts (Continued)
Pin
Number
Input/
Output Pin Description
MDS 05-4121A03, Rev. A TRM SB Integration Guide 13
3.0 TRANSCEIVER CONFIGURATION
AND DIAGNOSTIC COMMANDS
The transceiver’s configuration and diagnostics are performed through
the radio’s DATA INTERFACE connector through a “dumb” data terminal
interface—either a personal computer or dedicated terminal. An
EIA/RS-232 to TTL converter circuit may be required depending on
your installation design. Configuration and diagnostic activities may be
performed with the TRM SB removed from the user equipment or as an
installed module in your design.
If you choose to setup the transceiver before its final installation, you
may find the Test and Evaluation Assembly to be a convenient tool. (See
Test and Evaluation Assembly on Page 20 for details.)
Table 5 lists each command entry and a brief description of its purpose.
Programmable information is shown in brackets [ ] following the
command name.
To enter a command, type the command, followed by an
keystroke. For programming commands, the command is followed by
and the appropriate information or values, then .
Table 5. Command Summary
Command Function
MODEM MODEM—Data Configuration
Response indicates:
Payload data rate (BAUD)
+ Gaussian Bandwidth x Data Rate (BT)
+ Channel Spacing (BW)
For example: 9.6Kbps BT=.5 25KHz.
NOTE: Provides only an informational display. The
command cannot be used to configure the radio.
TX [xxx.xxxxx] Transmit RF Channel Frequency
• The frequency must be within the operating range for the
unit.
• Up to 5 digits can be entered after the decimal point.
Trailing zeros are not required.
• Frequencies can be in either 2.5, 5, or 6.25 kHz increments.
BAUD [xxxxx] “Over-the-Air” Modem Speed
• Options: 9600, and 19200
• For synchronous payload data through the DATA
INTERFACE port (J100)
NOTES:
• Must complement BT and BW values.
(See Table 1 on Page 2.)
• Data rate for serial data (RXD/TXD) diagnostic/command
interface is always 38400
ENTER
SPACE ENTER
14 TRM SB Integration Guide MDS 05-4121A03, Rev. A
BT [.x] Relative TX Bandwidth
• Valid options are .3 and .5
• Leading zero (Ø) not permitted
NOTE: Must complement BAUD and BW values.
(See Table 1 on Page 2.)
BW [xx.x] Channel Bandwidth
• Options: 25 and 12.5 kHz
NOTE: Must complement BT and BW values.
(See Table 1 on Page 2.)
CLK [xx] Clock Output Pin
Selects which serial clock line to use for transmit operation.
• Options: TX and RX
• TX = Pin 8/TXC
• RX = Pin 6/RXC
CDR [–xxx] Receiver Carrier Detect Threshold
• Inhibits the receiver from processing an incoming signal
unless it is above the setting’s level.
• Range: –50 to –120
NOTE: A setting of -120 removes any limitation on signal
detection.
CDT [–xxx] Transmit Carrier Detect Threshold
Inhibits the transmitter from operating in the presence of a
strong on-channel signal until the signal level is below the
setting level.
• Range: –50 to –120
NOTES:
• –50 will effectively allow transmissions anytime
• –120 will effectively prohibit transmissions.
• Minus sign (–) required for data entry
PWR [x] RF Power Output Level
Options:
H = High Power
L = Low Power
SCRAM [xxx] Data Scrambler/Descrambler ON/OFF
Options: ON or OFF
SREV [xxx] Software Revision of installed firmware
SER Serial Number of the radio
RSSI Received Signal Strength Indictor
• Displays the current received RF signal level
• One measurement per request by command
• Reading is accurate to within 3 dB from –100 dBm to –60
dBm
NOTE: A continuous RSSI signal available during receive
state on the DATA INTERFACE connector (J100-Pin12).
Table 5. Command Summary (Continued)
Command Function
MDS 05-4121A03, Rev. A TRM SB Integration Guide 15
3.1 Error Messages
Listed below are some possible error messages that may be encountered
when using the terminal interface:
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.
COMMAND FAILED—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 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.
OWN [xxx] Owner’s Message
Displays an optional owner message
• Enter OWN to display current entry.
• Enter OWN followed by up to 30 characters to program.
KEY Transmitter Carrier Key
• Test command for technicians to key the radio with a
modulated carrier.
• Use DKEY command to cease transmission
NOTES:
• Use only for test purposes.
• No time-out timer on this function.
DKEY Unkey Transmitter Test Carrier
Table 5. Command Summary (Continued)
Command Function
16 TRM SB Integration Guide MDS 05-4121A03, Rev. A
3.2 Initial Installation—Radio and Data
Configuration
Below are the basic steps for setting up of the transceiver once it is
installed in the user’s product. In many cases, these steps alone are
sufficient to complete the installation. This procedure assumes the
TRM SB has been installed in your system/product and suitable
connections have been provided for a terminal interface and antenna.
1. Install the antenna and antenna feedline for the station. Preset
directional antennas in the desired direction of transmission and
reception.
2. Connect a terminal (computer with emulations software) to the
TRM SB through the user’s product interface. (async @ 38400
w/8N1)
3. Enable the configuration mode for the TRM SB radio. (Ground
Pin 11 of the radio transceiver’s DATA INTERFACE.) DIAGNOSTICS
OPEN will appear on the terminal screen terminal once diagnostics
communication with the radio is established.
4. Review the existing essential TRM SB configuration parameters
through a series of terminal commands.
•MODEM—Data Configuration
Response indicates:
Payload data rate (BAUD)
Gaussian Bandwidth x Data Rate (BT)
Channel Spacing (BW)
For example: 9.6Kbps BT=.5 25KHz.
•PWR—RF Power Output
Responses: H = 1 Watt, L = 0.5 Watts
5. Check and set the radio transmit and receive frequencies.
NOTE: The operating frequencies are typically not set at the factory.
Determine the transmit and receive frequencies to be used, and
follow the steps below to program them. The TRM SB must be
programmed for the frequencies for which you hold a valid
license and be within the radio’s operating band.
a. Set the transmit frequency with the TX xxx.xxxxx command.
Press after the command.
ENTER
MDS 05-4121A03, Rev. A TRM SB Integration Guide 17
b. Set the receive frequency with the RX xxx.xxxxx command.
Press after the command.
c. After programming any parameter, PROGRAMMED OK will be
displayed to indicate a successful entry.
6. Review and reprogram any other parameters as necessary to
complement your system requirements. (See Table 5 on Page 13 for
a list of all user commands.)
7. Optimize the antenna installation by measuring the received signal
strength of the other station with which this station will be
communicating. Monitor the TRM SB’s RSSI level. Rotate the
station antenna until the signal is the strongest. The less negative the
value, the stronger the incoming radio signal.
The received signal should be at least –90 dBm. This value will
provide a safety margin (fade margin) to prevent loss of
communications through signal reduction (fading) caused by
weather conditions, changes in station location if mobile, or other
obstructions temporarily positioned between communicating
TRM SB stations.
8. Disconnect the terminal interface and the ground from Pin 11 from
the DATA INTERFACE connector.
9. Connect the data equipment to the transceiver’s DATA INTERFACE
connector and test for normal operation.
4.0 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.
• 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 may be
degraded.
ENTER
18 TRM SB Integration Guide MDS 05-4121A03, Rev. A
• Proper programming of the transceiver’s operating parameters
(see Section 3.0, TRANSCEIVER CONFIGURATION AND
DIAGNOSTIC COMMANDS).
• The correct interface between the transceiver and the connected
data equipment (correct cable wiring, proper data format, timing,
etc.).
5.0 TECHNICAL REFERENCE
5.1 Transceiver Specifications
RADIO TYPE
Synthesized, half duplex, 2.5, 5.0, and 6.25 kHz frequency set capability, 25 kHz
channel spacing, split frequency, or simplex
ENVIRONMENTAL
Temperature Range: –40 to +85 degrees C
Humidity: 0 to 95% at 40 degrees C
Board Dimensions: 2.75″ W x 0.4″ H x 1.75″ D
7.0 cm W x 1.10 cm H x 4.4 cm D
Weight: 35 grams (6053 Board: 42 grams)
Enclosure: None. Open-frame PCB with digital/RF circuit
shield
TRANSMITTER
Frequency Range: 216–235 MHz
Frequency Increments: 2.5, 5.0, 6.25 kHz
Frequency Stability: 1.0 ppm, –30 to +80 degrees C
2.5 ppm, –40 to +85 degrees C
Channel Spacing: 25 kHz
Modulation Type: GMSK (Gaussian-mean Shift Keying)
Carrier Power: 0.5 W to 2W programmable configurations (see
Primary Power specifications)
(+27 dBm to +33 dBm)
Duty Cycle: 50%
Output Impedance: 50 ohms
RF Connection: Pads for SMT IMP 3 mm RF connector, mmcx
Spurious and Harmonics: –65 dBc
Transmitter Keying: ON TX_ON
Key-up Time: 5 ms
Data Rate Over-the-Air : 9600 and 19200 bps
(Rate user-selectable via BAUD command)
RECEIVER
Type: Double conversion superheterodyne
(45 MHz IF)
Frequency Range: 216.025– 235 MHz
Frequency Increments: 2.5, 5.0, 6.25 kHz
Frequency Stability: 1.0 ppm, –30 to +80 degrees C
2.5 ppm, –40 to +85 degrees C
MDS 05-4121A03, Rev. A TRM SB Integration Guide 19
Spurious and Image Rejection: –50 dB
Sensitivity: 12 dB SINAD @ –116 dBm @ 9600 bps
12 dB SINAD @ –110 dBm @ 19200 bps
Intermodulation Rejection: –38 dB minimum
Selectivity: 50 dB typical at adjacent channel (EIA)
Bandwidth: 25 kHz
DATA INTERFACE
Connector: AVX fine-pitch 5046 series
Signaling: TTL
Data Rate—Diagnostics: 38400 bps asynchronous
Data Rate—Payload: 38400 bps synchronous
Flow-Control: Synchronous serial with clock supplied by the radio
in bursts of 8 bits (when the radio is ready)
Data Latency: < 20 ms typical
PRIMARY POWER (via Data Interface Connector)
Voltage (3.2–3.8 Vdc typical
usage): 216 to 235 MHz Band Segments
RX Current at 3.6 Vdc (nominal): 112 mA
TX Current at 3.6 Vdc (nominal): 1.5 A @ high power (1 W typical usage)
750 mA @ low power (0.5 W)
Voltage (3.8 Vdc max. DC
supply): 216 to 222 MHz Band Segments
RX Current at 3.8 Vdc (max. DC
supply: 112 mA
TX Current at 3.8 Vdc (max. DC
supply): 1.8 A @ high power (2 W max. setting)
750 mA @ low power (0.5 W)
Current Limit/Polarity Protection: External; User-provided
REGULATORY
Regulatory Bands
(Software Configurable): FCC (2 Watt max., -30 to +50 degrees C):
• 216–220 MHz, FCC Part 80
• 216–220 MHz, FCC Part 90
• 220–222 MHz, FCC Part 90
IC (2 Watt max., -30 to +50 degrees C):
• 217–218 MHz, RSS-119
• 219–220 MHz, RSS-119
• 220–222 MHz, RSS-119
International Regulatory (1 Watt max.):
• 220 –235 MHz
20 TRM SB Integration Guide MDS 05-4121A03, Rev. A
5.2 Test and Evaluation Assembly
A PCB assembly (03-6053A02) is available from the factory to facilitate
bench testing, programming and evaluation of the TRM SB transceiver
module. This module features:
• Mounting Posts for aligning and securing TRM SB module
• 3.6 Vdc Power Input Receptacle
• 5–12 Vdc Power Input Receptacle
• DB-25 Data Interface (Female)
providing EIA/RS-232 to TTL signalling conversion
• Radio Configuration Mode Enable (Manual Jumper)
• Activity LEDs:
TXD
RXD
TX CLOCK
RX CLOCK
CARRIER DETECT
TEST (Reserved)
• Antenna Connector–RF I/O (TNC)
• Receiver Analog Output through DB-25 interface connector
NOTE: The Test and Evaluation Assembly is not intended for service
in a permanent installation in a user-designed product or
system.
MDS 05-4121A03, Rev. A TRM SB Integration Guide 21
Invisible place holder
Figure 9. Test and Evaluation PCB Assembly
(With TRM SB module installed and retainers on RF connector end.)
3.6 VDC IN
TRM
SB MODULE
6–12 VDC IN
EIA/RS-232 I/O
TEST ANTENNA/LOAD DB-25(F)
ACTIVITY
LEDS
Table 6. DB-25 Interface Connector Pinouts
Test and Evaluation PCB
Pin
Number
Input/
Output Pin Description
1 IN/OUT
Ground
(Signal)
2IN
TX Data—Transmit Data
(payload) in normal operation
3 OUT
RX Data—Receive Data
•
Receive data (off-the-air) in normal operation
•
Control data from the processor in setup mode
4 OUT
TX ON—Request to key radio transmitter
•
High puts radio in transmit mode
•
Low puts radio in receive mode
5
6 No connection
7 IN/OUT
Ground
(Signal)
8 OUT CD—Carrier Detect
•
Low whenever RSSI exceeds the programmed CDR
threshold.
•
Detects RF activity on the radio channel without
consideration for the signals modulation type or protocol.
9 Factory Test– Do not connect
10 No connection
22 TRM SB Integration Guide MDS 05-4121A03, Rev. A
11 OUT
RX Audio—Filtered receive audio
•
For test purposes only
•
Also available through J109 (Pin 1 – Out, Pin 2 – GND)
12 IN
Shutdown
•
Low = Radio powered down (off-line)
13 OUT
RF synthesizer lock detect signal
•
High = locked (Radio ready for service)
•
Low = Out-of-lock (Radio disabled)
•
Raw / “unfiltered”
14 No connection
15 OUT
TX Clock—Transmit Data Clock
•
Only applicable when “
CLK TX
” is programmed and TX
ON is asserted
•
Clock goes from low to high to request each new TXD bit
•
Continuously high when in Configuration Mode (J100,
Pin 11 = Low), or when “
CLK RX
” is selected
16 No connection
17 OUT
RX Clock—
Always applicable when receiving
•
Goes from low to high at the center of each RX Data bit
(receive mode)
•
Provided when transmitting if “
CLK RX
” is programmed
•
Goes from low to high to request each new TXD bit
•
Continuously high when transceiver is in Configuration
Mode (J100, Pin 11 = Low)
18 Do not connect—Reserved for factory use only.
19 No connection
20 No connection
21 OUT
RSSI—Receive Signal Strength Indicator
• Analog voltage between 0 and 3 Vdc proportional to
signal strength on the channel
22 No connection
23 IN CONFIG—Configure Radio
• High (unterminated) puts radio in normal payload mode
to receive or transmit data at the programmed rate
• Low (Ground/J108 Jumpered) puts radio in setup mode
to communicate with the processor at 38.4 kbps
asynchronously
24 No connection
25 No connection
Table 6. DB-25 Interface Connector Pinouts
Test and Evaluation PCB (Continued)
Pin
Number
Input/
Output Pin Description
MDS 05-4121A03, Rev. A TRM SB Integration Guide 23
5.3 Vendors for Connectors
The following are vendors of interface connectors that may be used on
customer-designed interfaces or equipment connected to the TRM SB.
These are not the only sources of these devices nor does this listing
represent an endorsement by Microwave Data Systems.
Data Interface Connector
30-Pin PCB SMT Receptacle, J100
GE MDS: 73-3463A12
AVX: 14-5046-030-630-829
30-Pin PCB SMT Plug, Mates with J100
GE MDS: 73-3463A13
AVX: 24-5046-030-600-829
Vendor:
AVX Corporation
Web: www.AVXcorp.com
RF Coaxial Connector
PCB SMT Connector
Mounted on user’s mating PCB to make contact with TRM SB RF
pads J300/301
GE MDS: 73-1022A53
Radiall: R107.064.020
Vendor:
Radiall SA
101 Rue Philibert Hoffmann
93116 Rosny Sous Bois
France
Tel: + 33 1 49 35 35 35
FAX: + 33 1 49 35 35 14
Web: www. Radiall.com
24 TRM SB Integration Guide MDS 05-4121A03, Rev. A
5.4 dBm-Watts-Volts Conversion Chart
Table 7 is provided as a convenience for determining the equivalent
wattage or voltage of an RF power expressed in dBm.
Table 7. 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 μVPo
-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 μVPo
-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
MDS 05-4121A03, Rev. A TRM SB Integration Guide 25
6.0 GLOSSARY OF TERMS
If you are new to wireless networks, some of the terms used in this guide
may be unfamiliar. The following glossary explains many of these terms
and is helpful in understanding the operation of the transceiver.
Antenna System Gain—A figure, normally expressed in dB,
representing 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—See BPS.
BPS—Bits-per-second. A measure of the information transfer rate of
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.
CMII—China Management Methods.
Data Circuit-terminating Equipment—See DCE.
Data Communications Equipment—See DCE.
Data Terminal Equipment—See DTE.
dBi—Decibels referenced to an “ideal” isotropic radiator in free space.
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 is a DCE
device.
Decibel (dB)—A measure computed from the ratio between two signal
levels. Frequently used to express the gain (or loss) of a system.
DTE—Data Terminal Equipment. A device that provides data in the
form of digital signals at its output. Connects to the DCE device.
26 TRM SB Integration Guide MDS 05-4121A03, Rev. A
ETSI—European Telecommunications Standards Institute. A
non-profit group that produces and approves standards for use
throughout Europe and other locations pertaining to communications
equipment and systems.
Fade Margin—The greatest tolerable reduction in average received
signal strength that is 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 is
usually sufficient in most systems.
Gaussian-Mean Shift Keying (GMSK) Modulation—A form of
continuous-phase FSK, in which the phase is changed between bits to
provide a constant envelope.
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.
Latency—The delay (usually expressed in milliseconds) between when
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.
Multiple Address System—See MAS.
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.
Point-to-Multipoint System—A radio communications network or
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.
Programmable Logic Controller—See PLC.
Received Signal Strength Indication—See RSSI.
MDS 05-4121A03, Rev. A TRM SB Integration Guide 27
Redundant Operation—A station arrangement where two transceivers
and two power supplies are available for operation, with automatic
switchover in case of a failure.
Remote (Station)—A radio in a network that communicates with an
associated master station.
Remote Terminal Unit—See RTU.
RSSI—Received Signal Strength Indication. A measure, in dBm, of the
strength of the signal received by a radio from an antenna. The radio
must be properly calibrated for the RSSI value to be meaningful.
RTU—Remote Terminal Unit. A data collection device installed at a
remote radio site.
SCADA—Supervisory Control And Data Acquisition. An overall term
for the functions commonly provided through an MAS radio system.
Supervisory Control And Data Acquisition—See SCADA.
28 TRM SB Integration Guide MDS 05-4121A03, Rev. A
IN CASE OF DIFFICULTY...
GE 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.
TECHNICAL ASSISTANCE
Technical assistance for GE MDS products is available from our Technical Support Department during
business hours (8:30 A.M.—6:00 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:
Phone: 585 241-5510 E-Mail: TechSupport@GEmds.com
FAX: 585 242-8369 Web: www.GEmds.com
FACTORY SERVICE
Component level repair of this equipment is not recommended in the field. Many components 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 must obtain a Service Request Order (SRO) number. This
number helps 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 the outside of the shipping box, and on any corre-
spondence relating to the repair. No equipment will be accepted for repair without an SRO number.
SRO numbers are issued online at www.GEmds.com/support/product/sro/. Your number will be issued
immediately after the required information is entered. Please be sure to have the model number(s), serial
number(s), detailed reason for return, "ship to" address, "bill to" address, and contact name, phone number,
and fax number available when requesting an SRO number. A purchase order number or pre-payment will
be required for any units that are out of warranty, or for product conversion.
If you prefer, you may contact our Product Services department to obtain an SRO number:
Phone Number: 585-241-5540
Fax Number: 585-242-8400
E-mail Address: productservices@GEmds.com
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:
GE MDS, LLC
Product Services Department
(SRO No. XXXX)
175 Science Parkway
Rochester, NY 14620 USA
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. To
inquire about an in-process repair, you may contact our Product Services Group using the telephone, Fax,
or E-mail information given above.
GE MDS, LLC
Rochester, NY 14620
General Business: +1 585 242-9600
FAX: +1 585 242-9620
Web: www.GEmds.com
175 Science Parkway