GE MDS DS-LCT450 Tri-Mode Data Transceiver User Manual 4669B MDS SDx Data Xcvr Body

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Document ID	961928
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Document Description	User Manual
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Date Submitted	2008-06-27 00:00:00
Date Available	2008-06-27 00:00:00
Creation Date	2008-06-12 17:54:59
Producing Software	Acrobat Distiller 8.1.0 (Macintosh)
Document Lastmod	2008-06-25 08:43:37
Document Title	4669B-MDS SDx Data Xcvr-Body.fm
Document Creator	FrameMaker 7.0: LaserWriter 8 8.7.3
Document Author:	Kevin Carey

Tri-Mode Data Transceiver
Firmware Release 1.x.x
MDS 05-4819A01, Rev. 01
MAY 2008
Start-Up Guide
MDS LCT 450
OPERATIONAL & SAFETY NOTICES
RF Exposure
Concentrated energy from a directional antenna may pose a health hazard to
humans. Do not allow people to come closer to the antenna than the distances
listed in the table below when the transmitter is operating. More information on
RF exposure can be found online at the following website:
www.fcc.gov/oet/info/documents/bulletins.
Antenna Gain vs. Recommended Safety Distance
Device complies with Power Density requirements at 20 cm
separation:
No
Required separation distance for 9 dBi antenna (in m):
2.53
Above data based on a 30-watt output level with a 100% duty cycle.
FCC Part 15 Notice
The transceiver is approved under Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Any unauthorized modification
or changes to this device without the express approval of Microwave Data Systems may void the user’s
authority to operate this device. Furthermore, this device is intended to be used only when installed in
accordance with the instructions outlined in this manual. Failure to comply with these instructions may
void the user’s authority to operate this device.
INTRODUCTION
This guide presents basic installation and operating instructions for the
MDS LCT 450 Series wireless transceiver.
The transceiver (Figure 1) is designed to operate in the Railroad Distributed Power application. It is software-configurable to provide flexible operation in a variety of applications using one hardware
platform. It employs microprocessor control and Digital Signal Processing (DSP) technology to provide robust communications even
under adverse conditions.
Figure 1. Data Transceiver
NOTE: Some features may not be available on all units, based on the
options purchased and the applicable regulatory constraints
for the region in which the radio will operate.
Front Panel Connectors
Figure 2 and Figure 3 show the interface connectors and indicators on
the transceiver’s front an d rear panels. These items are referenced in
the installation steps given later in this guide.
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MDS SD4 Startup Guide
Invisibleplaceholder
Power Input
(10.5 to 16 Vdc @ 8A)
Antenna
(Mini-UHF)
Figure 2. Antenna & DC Power Connectors
Invisibleplaceholder
PWR
TXD
DCD
RXD
LED Indicator Panel
(See inset above)
Data Interface
(DB-25)
Figure 3. Data Interface Connector & LED Status Panel
INSTALLATION
There are three main requirements for installing the transceiver:
• Adequate and stable primary power
• An efficient and properly installed antenna system
• Correct data connections between the transceiver and the data
device.
MDS SD4 Startup Guide
05-4819A01, Rev. 01
Figure 4 shows a typical station arrangement. This is followed by
step-by-step procedures for installing the transceiver and making front
and rear panel connections.
DATA EQUIPMENT
ANTENNA
SYSTEM
RADIO
TRANSCEIVER
DC POWER CABLE
10.5—16 VDC @ 8A
Negative Ground
LOW-LOSS
COAXIAL CABLE
(50 Ohm)
Figure 4. Typical Station Arrangement
Installation Steps
Below are the basic steps for installing the transceiver. Refer to
Figure 4 as necessary to make the cable connections.
1. Mount the transceiver to a stable surface using the brackets
supplied with the radio. Begin by attaching the radio’s mounting
brackets to the bottom of the transceiver case (if not already
attached) using the four 6-32 x 1/4 inch (6 mm) screws supplied.
Figure 5 shows the mounting bracket dimensions.
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MDS SD4 Startup Guide
NOTE: To prevent moisture from entering the radio, do not mount the
case with the cable connectors pointing up. Also, dress all
cables to prevent moisture from running along the cables and
into the radio.
Invisibleplaceholder
7.25"
184 mm
1 .7 5 "
4 .4 4 C M
2.75"
70 mm
ALTERNATE
POSITION
6.63"
168 mm
8.5"
216 mm
2.25"
57 mm
2.0"
50 mm
5.625"
143 mm
Figure 5. Transceiver Mounting Bracket Dimensions
CAUTION
POSSIBLE
EQUIPMENT
DAMAGE
Using screws longer than 1/4 inch (6 mm) to attach the
brackets to the radio may damage the internal PC
board. Use only the supplied screws.
2. Install the antenna and feedline for the station. The antenna
used with the transceiver must be designed to operate in the
radio’s frequency band, and be mounted in a location that provides a clear, path to the other associated station(s). Use low loss
coaxial feedline and keep the cable as short as possible.
MDS SD4 Startup Guide
05-4819A01, Rev. 01
3. Connect the data equipment to the DATA INTERFACE connector. Check DATA INTERFACE REFERENCE on Page 13 for pin
wiring details.
Note: The radio’s DIAGNOSTICS port is used for reprogramming
the radio’s firmware.
4. Connect primary power to the transceiver. Power applied must
be within 10.5–16 Vdc and capable of continuously providing at
least 8 Amperes. A power connector with is provided with each
unit (see Figure 4).
CAUTION
POSSIBLE
EQUIPMENT
DAMAGE
The transceiver is designed for use with negative-ground systems only. The power supply should be
equipped with overload protection (NEC Class 2 rating),
to protect against a short circuit between its output terminals and the radio’s power connector.
5. Set the radio’s configuration. The transceiver is designed for
quick installation with a minimum of software configuration
required.
a. Connect a PC to the transceiver’s DATA INTERFACE connector as shown in Figure 6. If desired, a cable may be built using
the information shown on Page 13 of this guide.
b. Launch a terminal communications program, such as HyperTerminal (included with most WindowsTM systems). Press the
ENTER key a few times (at half-second intervals) to receive
the ready “>” prompt on the screen.
NOTE: To prevent unintended keying of the transmitter during
management activities, set PTTSIG to OFF, or do not
connect to Pin 6 of the COM1 port.
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MDS SD4 Startup Guide
Invisibleplaceholder
Transceiver
PC Running Terminal Session
To DB-25
Data Interface Port
Figure 6. PC Configuration Setup
c. Set the transmit frequency by entering TX xxx.xxxx, where
xxx.xxxx is the frequency in MHz. Press ENTER . The
response PROGRAMMED OK indicates successful entry.
d. Set the receive frequency by entering RX xxx.xxxx, where
xxx.xxxx is the frequency in MHz. Press ENTER . The
response PROGRAMMED OK indicates successful entry.
e. Set the radio’s modem type if necessary, using the MODEM
xxxx command, where xxxx is the modem selection (typically
4800 or 9600). The default setting is 9600. Set the radio’s serial
data interface rate (typically BAUD 9600 8N1).
This completes the initial setup and configuration of the radio.
MDS SD4 Startup Guide
05-4819A01, Rev. 01
SOFTWARE COMMAND SUMMARY
Table 1 lists software commands commonly used during initial installation and setup of the transceiver.
Table 1. Command Summary
Command Name
Function
BAUD [xxxx xxx]
Sets radio’s serial data interface rate/format.
Default setting is BAUD 9600 8N1.
DKEY
Dekey the radio (transmitter OFF). This is
generally a radio test command.
KEY
Key the radio (transmitter ON). This is
generally a radio test command.
MODEM [xxxx]
Set the modem characteristics of the radio.
PWR [37–45]
Set or display the transmit power setting.
PTTSIG [ON, OFF]
Set/display push-to-talk configuration.
RSSI
Display the Received Signal Strength
Indication.
RX [xxx.xxxx]
Set or display receiver frequency.
SER
Display the radio serial number.
SNR
Signal-to-Noise Ratio (in dB).
SPECTRUM
[xxx.xx]
Display internal spectrum analyzer, where
xxx.xx characters denote center frequency
in MHz. The command spectrum may be
entered alone to view current operating
channel.
SREV
Display the Software Revision Level.
STAT
Display radio status and alarms.
TEMP
Display the internal temperature of the radio
in degrees C.
TX [xxx.xxxx]
Set or display the transmit frequency.
Detailed Command Usage
(This section currently under revision)
chan [chan # [rxfreq # [txfreq # [pwr # [bw # ] ] ] ] }
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MDS SD4 Startup Guide
chan - channel # {all,0-8]
rxfreq - receiver frequency
txfreq - transmitter frequency
pwr - power in watts (5, 20, 25, 30)
bw - bandwidth (12.5, 25)
>chan
Channel 1 RX 452.92500 MHz TX 452.92500 MHz PWR 30 Watts BW
25.000 KHz
>chan all
Selected LCT Channel is 0
Channel 0 RX 450.00000 MHz TX 453.00000 MHz PWR 5 Watts BW 25.000
KHz
Channel 1 RX 452.92500 MHz TX 452.92500 MHz PWR 30 Watts BW
25.000 KHz
Channel 2 RX 452.95000 MHz TX 452.95000 MHz PWR 30 Watts BW
25.000 KHz
Channel 3 RX 457.92500 MHz TX 457.92500 MHz PWR 30 Watts BW
25.000 KHz
Channel 4 RX 457.95000 MHz TX 457.95000 MHz PWR 30 Watts BW
25.000 KHz
Channel 5 RX 452.92500 MHz TX 452.92500 MHz PWR 30 Watts BW
25.000 KHz
Channel 6 RX 452.95000 MHz TX 452.95000 MHz PWR 30 Watts BW
25.000 KHz
Channel 7 RX 457.92500 MHz TX 457.92500 MHz PWR 30 Watts BW
25.000 KHz
Channel 8 RX 457.95000 MHz TX 457.95000 MHz PWR 30 Watts BW
25.000 KHz
>chan 8 rxfreq 453
rxfreq 453
Channel 8 RX 453.00000 MHz TX 457.95000 MHz PWR 30 Watts BW
25.000 KHz
>chan 8 pwr 20
pwr 20
Channel 8 RX 453.00000 MHz TX 457.95000 MHz PWR 20 Watts BW
25.000 KHz
>chan 8 bw 12.5
bw 12.5
MDS SD4 Startup Guide
05-4819A01, Rev. 01
Channel 8 RX 453.00000 MHz TX 457.95000 MHz PWR 20 Watts BW
12.500 KHz
>mode test
>selchan help
Usage:
selchan [0-8]
>selchan 8
Channel Number 8
>chan
Channel 8 RX 453.00000 MHz TX 457.95000 MHz PWR 20 Watts BW
12.500 KHz
>key
TRANSMITTER ENABLED
>dkey
TRANSMITTER DISABLED
>mode normal
TROUBLESHOOTING
For proper operation, all radios in the network must meet these basic
requirements:
• Adequate and stable primary power
• Secure connections (RF, data and power)
• A clear transmission path between stations
• An efficient antenna system providing adequate received signal
strength.
• Proper programming of the transceiver’s operating parameters
• The correct interface between the transceiver and the connected
data equipment (correct cable wiring, proper data format, timing, etc.)
LED Indicators
The LED status indicators (Figure 7) are an important troubleshooting
aid and should be checked whenever a problem is suspected. Table 2
describes the function of each status LED on the front panel of the
radio.
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MDS SD4 Startup Guide
Invisibleplaceholder
PWR
TXD
DCD
RXD
Figure 7. LED Indicators
Table 2. LED Status Indicators
LED Name
PWR
Description
• Continuous—Power applied, no problems detected.
• Rapid flash (5 times-per-second)—Alarm indication.
TXD
Data being transmitted over the air.
RXD
Data being received over the air.
DCD
When lit, indicates that a communication link is established
with the other station(s).
Event Codes
When an alarm condition exists, the transceiver creates a code that can
be read on a connected terminal. These codes can be helpful in
resolving many system difficulties. Refer to Table 3 (Page 11) for a
definition of the event codes.
Checking for Alarms—STAT command
To check for alarms, connect a terminal to the radio’s DIAGNOSTICS
port. See DATA INTERFACE REFERENCE on Page 13 for pinout
information.
Enter STAT on the connected terminal. If no alarms exist, the message
NO ALARMS PRESENT appears on the display.
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 MORE appears on the screen.
To view additional alarms, press ENTER .
10
MDS SD4 Startup Guide
05-4819A01, Rev. 01
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 hamper) further operation of the transceiver. Major alarms
generally indicate the need for factory repair. Contact your factory
representative for assistance.
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 system failure.
Event Code Definitions
Table 3 contains a listing of event codes that may be reported by the
transceiver. The codes shown are a subset of a larger pool of codes
used for various GE MDS products. For this reason, the table does not
show a sequential listing of all code numbers. Only the codes applicable to this product are shown.
Table 3. Event Codes
Event
Code
Event
Class
Description
01
Major
Improper software detected for this radio model.
04
Major
The RF synthesizer is reporting an out-of-lock
condition.
08
Major
The system is reporting that it has not been
calibrated. Factory calibration is required for proper
radio operation.
12
Major
Receiver time-out. No data received within the
specified receiver time-out time.
13
Minor
A Transmitter timeout was detected. The radio
stayed keyed longer than the duration specified by
the TOT command.
17
Minor
A data parity fault has been detected on the
PAYLOAD port. This usually indicates a parity
setting mismatch between the radio and the
customer equipment.
18
Minor
A data framing error has been detected on the
PAYLOAD port. This may indicate a baud rate
mismatch between the radio and the customer
equipment.
05-4819A01, Rev. 01
MDS SD4 Startup Guide
11
Table 3. Event Codes (Cont’d)
Event
Code
Event
Class
Description
26
Minor
The DC input voltage is out-of-tolerance. If the
voltage is too far out of tolerance, operation may fail.
31
Minor
The transceiver’s internal temperature is
approaching an out-of-tolerance condition. If the
temperature drifts outside of the recommended
operating range, system operation may fail.
Internal Spectrum Analyzer
The radio contains a built-in spectrum analyzer tool (Figure 8) that can
be displayed on a connected PC. The tool is helpful in diagnosing
interference problems on or near your channel frequency.
Access the spectrum analyzer by entering spectrum at the command
prompt. A display appears showing detected signals on your current
channel.
Optionally, you can specify a frequency at the command prompt to
view the surrounding spectrum of that frequency. To do this, enter
spectrum xxx.xx, where xxx.xx is the frequency in MHz.
As shown in Figure 8, the display creates a received signal strength
indication (RSSI) vs. frequency plot for the frequency and surrounding signals. By analyzing the display, you can determine the
presence of other signals near the transceiver’s operating frequency.
This information can be helpful in troubleshooting interference problems.
12
MDS SD4 Startup Guide
05-4819A01, Rev. 01
Invisibleplaceholder
Figure 8. Internal Spectrum Analyzer Display
DATA INTERFACE REFERENCE
(This section currently under revision)
Table 4 lists the pin functions on the DB-25 DATA INTERFACE connector.
Table 4. LED Status Indicators
Pin No.
Description
No connection.
Ground—Connects to ground (negative supply potential)
on the radio’s PC board.
No connection.
Detected Audio.
Channel 3 Select (see Note 1).
RX(A) RS-485 digital.
Data PTT (Keying Signal).
RX(B) (RS-485 digital
05-4819A01, Rev. 01
MDS SD4 Startup Guide
13
Table 4. LED Status Indicators
+5 Vdc to programming device
10
Programming data (bi-directional [SRI] or TD [ARIA])
11
Ground—Connects to ground (negative supply potential)
on the radio’s PC board.
12
Power Switch Contact (momentary ground changes
state) (Unique to SRI)
13
Return (Ground) to programming interface.
14
Channel 2 select (See Note 1)
15
Programming data, RD (unique to ARIA)
16
NCData Interface Control (High = analog input, Low=
digital input)
17
TX Audio
18
Ground—Connects to ground (negative supply potential)
on the radio’s PC board.
19
Channel 0 select (Note 1)
20
+13.6 VDC
21
Ground—Connects to ground (negative supply potential)
on the radio’s PC board.
22
+13.6 VDC
23
Channel 1 select (Note 1)
24
NCTBD – TX(A) (RS485 digital)
25
NCTBD – TX(B) (RS485 digital)
Notes:
Note 1: Channel select decoding: (High = no connection, Low= Gnd)
Chan 3 Chan 2 Chan 1 Chan 0 Selected
High (future use) High High High 1
High (future use) High High Low 2
High (future use) High Low High 3
High (future use) High Low Low 4
High (future use) Low High High 5
High (future use) Low High Low 6
High (future use) Low Low High 7
High (future use) Low Low Low 8
14
MDS SD4 Startup Guide
05-4819A01, Rev. 01
SPECIFICATIONS
GENERAL
Frequency Range*:
450–512 MHz
RECEIVER
Maximum Usable Sensitivity:
–110 dBm at 1x10–6 BER (Preliminary)
Bandwidth:
12.5 kHz
TRANSMITTER
RF Carrier Power:
Duty Cycle:
Output Impedance:
Channel Spacing:
FCC Emission Designators:
12.5 kHz B/W:
25.0 kHz B/W:
5 Watts to 30 Watts
25%
50 Ω
6.25, 12.5, 25 kHz
9K25F1D, 9K25F2D, 9K25F3D
16K5F1D. 16K5F2D, 16K5F3D
DATA CHARACTERISTICS
Payload Signaling Type:
Connector Type:
Payload Data Rates:
Payload Data Latency:
EIA/RS-485
DB-25 Female
300–115200 bps, asynchronous
10 ms maximum
DIAGNOSTICS INTERFACE
Signaling Standard:
RS-232
PRIMARY POWER
Voltage:
TX Supply Current:
RX Supply Current:
Fuse:
13.8 Vdc Nominal (10.5 to 16 Vdc)
Negative-Ground Systems Only
8 Amperes (Typical) @ 30 Watts Output
Operational—125 mA, Nominal
8-Ampere, internal
ENVIRONMENTAL
Humidity:
Temperature Range:
Weight:
05-4819A01, Rev. 01
95% at 40 degrees C (104°F),
non-condensing
–40 to 70 degrees C (–40°F to +158°F)
1.0 kilograms
MDS SD4 Startup Guide
15
16
MDS SD4 Startup Guide
05-4819A01, Rev. 01
Installation Guide
GE MDS, LLC
175 Science Parkway
Rochester, NY 14620
General Business: +1 585 242-9600
FAX: +1 585 242-9620
Web: www.GEmds.com

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