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Table 15: AT-commands for basic operation
3.4.1 Troubleshooting
1. The modem status indicators do not light:
• Check if the modem is connected to a 10.8 .. 31.2 V DC power
supply properly.
• Check if also the Ignition Line is connected to a 10.8 .. 31.2 V DC
power supply properly.
• Check if the power connector is properly inserted.
2. The modem does not respond to the terminal program:
• Check if the RS232 cable is connected properly.
• Check if your program has proper settings. Manufacture settings
of the modem are as below:
3 GPRS troubleshooting
As already mentioned, GPRS is a rather new technology and as a
consequence networks and mobiles haven't reached yet the stability
level they've been enjoying in GSM.
So expect some failures every so often or total failure on some
networks!
Unfortunately, if you experience a failure (to attach, to activate a
session, etc) , there aren't many workarounds you can try.
3.1. Failure to log onto the GPRS network.
In such a case, try logging onto the GSM network by issuing:
AT+CGCLASS="CC" if MS was in class CG.
Registration progress can be checked with:
AT+ CREG?
See the AT command guide for more information about this
command.
Basically if after a short while it responds +CREG:0,1 then the MS
has successfully completed GSM attachment.
As consequence, failure to GPRS attachment is likely due to either:
MS firmware fault (contact one of Falcom's distributors)
-
the cell the MS is camped on does not support GPRS. So far,
-
there isn't any means to check whether a cell supports GPRS.
In case GSM registration fails as well, faulty hardware or bad
antenna/power connection may be suspected.
Check also the SIM card, and be sure to enter PIN code if needed.
It's also worth to check the MS's IMEI.
3.2. Failure to activate a session
This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission.
9600 bps
8 data bits
No parity bit
1 stop bit
2
VERSION 1.04
Page 42
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