User's Manual

905U-K.MAN Rev. 1.1 January 2002
 ELPRO Technologies Pty Ltd Page 35
5 TROUBLESHOOTING
System Problems
Most problems relate to incorrect configuration, or radio path problems. Before installing the
905U-K module, "bench-test" its operation with the receiving 905U module alongside. If the
905U-K does not work properly in this test, it will not work properly installed. If problems
are found, check the configuration.
If the bench-test is successful, however problems are experienced after installation, check the
radio path (refer to the 105 User Manual for radio path testing).
The 905U-K provides the following diagnostic features which will help to identify problems.
LED Indicators.
Normally the green OK LED on the front panel will flash briefly every 10 seconds. When the
OK LED extinguishes a sleepmode state is indicated conserving the 905U-K's battery power.
If the OK LED does not flash, a flat battery condition or an internal failure may exist. If the
905U-K module is located outside, then it will be difficult to see when the LED indicators are
on. Remove the front lid of the 905U-K to see the LED's better.
The yellow TX LED will flash whenever a radio transmission occurs.
Table of indicator conditions
INDICATOR CONDITION MEANING
OK LED ON Flashes briefly Normal Operation
OK LED OFF Continuously Battery Voltage low
CPU failure
OK LED ON Continuously Analogue loop on
Configuration cable connected
TX LED ON Flashes briefly Radio transmitting
Diagnostic Features
The configuration software provides some diagnostic features to help identify problems. To
use these features, connect the 905U-K to a PC using a RS232 cable and run the
configuration software. The OK LED will light continuously once the module is in
configuration mode.