GM862-GPS

GPS/GNSS Development Boards
1

I’m having some trouble getting my GM862-GPS to go online.

I’ve tested my SIM card in an iPhone 3GS, so I know the data plan is active and working properly. The GM862 connects to AT&T’s network, I give it the same APN settings as the iPhone, but I always get an error back after the AT#GPRS=1 command “+CME ERROR: activation failed”.

AT#CEER returns “#CEER: 237”, which Telit’s documentation (along with just about every other GPRS doc I can find) defines as “PDP unsuccessful activation cause SM refuse”. However I can’t seem to find the acronym ‘SM’ explicitly defined anywhere. Anyone else had this problem, or know what the #CEER: 237 error code means?

The only solution to “activation failed” I’ve seen suggested anywhere is to upgrade the GM862 firmware… I flashed the unit with the 07.03.401 and 07.03.402 revisions (hosted on round solutions web site), same behavior on all three (I started with 400). I also sent Telit an email earlier today but haven’t heard back yet.

Also, the SIM is basically setup for an iPad or tablet, data plan only.

OK
AT

OK
AT+CREG?

+CREG: 2,1,"178F","1CE1"

OK
AT+COPS?

+COPS: 0,0,"Cingular"

OK
AT+CGREG?

+CGREG: 2,1,"178F","1CE1"

OK
AT+CGDCONT=1,"IP","Broadband"

OK
AT#USERID=""

OK
AT#PASSW=""

OK
AT#GPRS=1

+CME ERROR: activation failed
AT#CEER

#CEER: 237

OK
2

Did you ever track this down? I’m running into the same problem with a different module. Like you, I haven’t been able to find any information about what “PDP unsuccessful activation cause SM refuse” means.

3

Well, are there any other registers you could read to try to pinpoint your issue? I’m not familiar with GPS, but I would just go through debugging. Make sure all of the registers are outputting the correct values and not getting any flags.