CMS Error 331 causes?

[Malcolm Knapp]

I am working on a remote sensing project that uses a GM862 to
communicate sensor data over the cell network to a RapidSMS server.
The problem we are having is that we are getting a "No network
service" error (CMS ERROR: 331) quite regularly. Running out of credit
did cause this in some situations but not all of them. Research online
has turned up no other reasons what could cause this error.

So I was wondering if you can give me some other reasons why this
error could happen and possible solutions to it.

Thanks

Malcolm Knapp

[aaron....@gmail.com]

Is the device roaming?
Sent from my BlackBerry® smartphone with Nextel Direct Connect

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[Malcolm Knapp]

Hello Arron,

Thanks for answering.

The device is using a T-mobile SIM card and I confirmed that it is
attached to that network.

[aaron....@gmail.com]

Can you send/receive manually by using hyperterminal or putty through the Com Port? Also, turn on detailed error logging (the command escapes me at the moment, I'm on the road)

[Benedetta Piantella Simeonidis]

With the GM862 I had a lot of different issues and bugs and I'm trying to figure out if this was one of them.
Personally I didnt get the CMS 331 error when out of credit, but an unknown error (but I was also testing in Uganda at the time).
Whenever I had received a CMS 331 error I was:

-whether on the wrong band
-the module had not fully initialized yet, and the first few functions i would call once the module was started would return the error until the module was fully on
-i had logic conversion issues with that module (and for the most part nothing worked at the beginning when using the Sparkfun breakout board. After doing a more targeted voltage/logic control circuit, the module worked fine)

Are any other calls/at commands working on the GM862? Can you successfully send or get signal strength?

I have had so many things go wrong with these little guys that I would be surprised if this is something I didn't run into also.

good luck

B_

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Benedetta Piantella Simeonidis
Hardware Developer & Founder of GROUND Lab
Phone US: +1.347.495.1237
Phone EU: +39.3397921313
www.groundlab.cc