User's Manual

Appendix A Hayes Commands
Page 31 © February 2005
Chapter Six TROUBLESHOOTING
6.1 Diagnostics Chart
INDICATOR CONDITION MEANING
OK LED OFF Continuously
• Power supply failure
• CPU failure
OK LED ON Continuously
• Normal Operation
Radio TX LED ON Flashes briefly
• Radio transmitting
Radio RX LED ON GREEN flash
RED flash
• Radio receiving data
• Weak radio signal (< -95dBm)
Serial RX LED ON GREEN flash
RED flash
• Serial Port Receiving
• Input buffer almost full
Serial TX LED ON Flashes briefly
• Serial port transmitting
LINK LED ON Continuously
• A radio link has been
established.
The green OK LED on the front panel indicates correct operation of the unit. This LED
extinguishes on failure as described above. When the OK LED extinguishes shutdown state is
indicated. On processor failure, or on failure during startup diagnostics, the unit shuts down, and
remains in shutdown until the fault is rectified.
6.1 Connectivity
6.1 Monitor Communications