TC65i does not recognize the GSM network | Telit Cinterion IoT Developer Community
July 7, 2020 - 10:54am, 3356 views
Problem with TC65i
we have hundreds of modems having the TC65i module with SIM "Data 2g" and connected to specific equipment, each equipment sends hundreds of SMS every day through this modem, also, we can communicate to this equipment through this modem and read information from this equipment.
everything has been running perfectly for the past seven years.
currently, they have become unresponsive, when you put the chip in another type of modem it works normally, and when returned the SIM in the TC65i modem, it works for a period varying between 10 to 15 hours before stagnating ( indicates GSM absent, does not recognize the network).
the GSM network operator informs us that the SIMs have no problem.
we have modified some configurations with the AT commadnds but the problem persists.
help me please.
Hello,
Do you have some more observations? For instance was operator or SIM cards changed recently? Does it happen in a specific area?
Do you have any log? It seems that the problem occures after many hours of normal work - have you also tested the same SIM in another device for so long?
Have you tried to deregister from the network and register again, check available networks etc.? Does rebooting the module help? What are the replies for example for AT+COPS?, AT+CREG?, AT^MONI,AT+CEER when it happens?
Regards,
Bartłomiej
I put a SIM card on the modem (Module TC65i) and I connect the modem to my PC
I applied the following commands:
AT + CMGS = "**********"
> hi!
+ CMGS: 21
Ok
- the SMS is successfully sent and received
- the modem was blocked after approximately 5 seconds from the sending of the SMS
-When I restart this modem, it remains in the blocking state
-when I put this SIM card in another modem of the same type (TC65i module) and start it up, it also in a blocking state.
-when I put this SIM card in a modem of another type, it works perfectly, and if we keep the SIM card in this modem for a period exceeding 10 minutes and put it back in our modem in question (Module TC65i), the modem (Moudule TC65i) works normally and after sending one SMS, the modem is blocked.
It would be a pleasure if you asked me to apply AT Commands to this modem and present the results to you, thanks for the help
before sending an sms (because sending an sms make the modem in non responding state) we apply the following commands:
at+cops?
+COPS: 0,0,"ALG Mobilis"
OK
at+creg?
+CREG: 0,1
OK
at^moni
Serving Cell I Dedicated channel
chann rs dBm MCC MNC LAC cell NCC BCC PWR RXLev C1 I chann TS timAdv PWR dBm Q ChMod
118 59 -51 603 01 42CE 2EEC 7 4 33 -103 51 I No connection
OK
at+ceer
+CEER: 35,0,17
OK
Hello,
It is now not clear for me what the main problem is. My first understanding was that the module is rejected from the network and can't register. Now you write that the module is 'blocked'. Does it mean that it doesn't reply for AT commands?
Was anyting changed recently in the setup before this problem started occuring, especially SIM cards?
Regards,
Bartłomiej
Hello;
at first, we think that the problem is due to gsm network, after a diagnosis by the putting of a new SIM Card to one of the modems we notice that the modem is recognized the GSM network, and just after sending an SMS, the modem does not respond to AT commands and the GSM signal off, and if we put this SIM Card in another TC65i modem "new", this modem also does not respond from the first time of its start and also its GSM signal is off.
- no recent modification in the configuration of MODEM before this problem occurs.
- for the SIM card, the operator informed us that nothing has changed.
Hello,
These modules are quite old already so I can imagine some incompatibility between a new SIM card (some provider's application on SIM) and the module.
So I understand that there is no reply at all for any command? How do you know that the module does not register to the network? Do you have any log from your app - are there any URCs before this problem happens? Do you use SIM Application Toolkit in your app?
As for the +CEER: 35,0,17 I have found the following information - this error is returned by the network when it is requested to perform an operation which is not compatiblewith the current status of the relevant supplementary service. If the problems happens after SMS sending maybe it is a good idea to check all the settings related to SMS.
Regards,
Bartłomiej
Hi!
I think the problem is related to the status of the delivery report, how I can stop it!
Hello,
Please see AT+CSMS configuration. The default is 0(Phase 2). 1(Phase 2+) is required for delivery reports. If delivery reports are active your app ***** to confirm with AT+CNMA command. As far as I remember for some other module it may not be possible to send another message until the delivery report of previous one is confirmed.
Maybe this is the case - the module is using Phase2+ and does not confirm the delivery report but tries to send another message.
Regards,
Bartłomiej