User's Manual

Chapter Six Troubleshooting
Man_455U Rev 1.0 Page 47
6.2.2 Bit Error Rate Test (BER)
BER may be tested by typing AT#B (BER master) The sending unit will repeatedly send
pseudo-random frames, and the receiving unit will check these frames for errors. The
receiving unit returns a response message indicating how many (if any) errors were found.
The test results are displayed on the sending unit.
An example of the sending unit’s display is here.
Test Errors Extra Level TotErr TotMissed TotTest
109 0 0 -77dBm 3 0 109 kbit
Test - the sequence number of the last received frame
Errors - the number of bit errors in the last received frame
Extra - any extra characters at the end of the frame (negative numbers indicate
frame dropped out early)
Level - the RSSI level when the frame was received.
TotErr - The total errors received during this test.
TotMissed The number of missed frames during this test
TotTest - The total number of bits sent (in 1000’s)
Occasionally during testing, the following may be displayed:
Test Errors Extra Level TotErr TotTest
Bad Header
This indicated that the header information has been corrupted. Corrupted headers do not
contribute to the bit errors, which are calculated only on the 1,000 bit frame.
The BER test will automatically end if a test time has been entered at S8 register (refer
Appendix A). If S8 has a zero value (default), the timer is inactive and the BER test will
continue until manually stopped.
6.2.3 On-line diagnostics
Some diagnostic values may be read by a host device, using AT commands. These values
include the radio signal strength of the last message received (ATS9?) and the reason for the
communication link resetting in Acknowledged mode (ATS12?) - refer Appendix 1.
Other Diagnostic registers are :
S-Register Meaning
S31 Radio Flags, 0 for All OK, Otherwise some Radio faults. (8 indicates no antenna)
S32 Module Temperature (Subtract 50 to get temp in deg C)
S33 State of Digital I/O point
S34 Battery Input Voltage (Units 0.1Volt)
S35 Supply Input Voltage (Units 0.1Volt) (0-25.5 Volts)