User's Manual

MDS 05-2708A01, Rev. A MDS TransNET I/O Guide 35
• Adequate and stable primary power
• An efficient and properly aligned antenna system
• Secure connections (RF, data & power)
• Proper programming of the radio’s operating parameters, especially
Mode selection (
MODE), Network Address (ADDR), and interface
Baud Rate (BAUD)
• The correct interface between the radio and the connected data
equipment (proper cable wiring, data format and timing).
8.1 LED Indicators
The LED status indicators are an important troubleshooting tool and should be
checked whenever a problem is suspected. Table 8 describes the function of
each status LED.
8.2 Alarm Codes
When an alarm condition exists, the transceiver creates an alarm code. These
codes can be very helpful in resolving many system difficulties.
Checking for Alarms—STAT command
To check for the presence of alarms, enter STAT. If no alarms exist, the message
NO ALARMS PRESENT appears at the top of the display.
If an alarm does exist, a two-digit alarm code (00–31) is displayed, and it is
identified as a major or minor alarm. A brief description of the alarm is also
given. Alarm codes and their meanings are listed in Table 9.
If more than one alarm exists, the word
MORE appears at the bottom of the
screen; additional alarms can be viewed by pressing .
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.
PWR SYNC TXD RXD
Table 8. LED status indicators
LED Name Description
PWR • Continuous—Power is applied to the radio, no problems detected.
• Flashing 5 times per second—Fault indication.
See
Section 8.0, TROUBLESHOOTING (beginning on page
34)
.
• Flashing once every 4 seconds—Radio is in Sleep Mode.
SYNC Lights continuously to indicate the radio is receiving/sending
synchronization frames. Within 16 seconds of start-up, this LED should
be lit continuously.
TXD Indicates EIA-232 space signal (logic high) input to the DB-9 connector.
RXD Indicates EIA-232 space signal (logic high) output from the DB-9
connector.
ENTER