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Cinterion MC55i reports "SIM not inserted" after several use | Telit Cinterion IoT Developer Community

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mdesortis's picture
mdesortis

July 11, 2014 - 2:37pm, 6890 views

Good morning, We are integrating MC55i in a system based of a Fujitsu RX100 Server equipped with Windows 2008 Server. This appliance is intended to work H24/7days. The purpose is to send SMS to well known recipients when a specified event is reported on the server. After 1/2 days of normal working (or in other cases in some randomic time) the modem reports "CME Error: SIM not inserted" and the LED is blinking 1 second (no registered to network). Obviously the SIM card is still inside the modem and nobody touched it. To solve the problem We have to restart the entire server and re-power the modem. Sim cards used are provided by "Vodafone IT" Do You have any suggestions/requests of details? Thanks in advance
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Jędrzej Gemalto Moderator's picture
Jędrzej Gemalto...
Jul 11 2014 - 4:27pm
Hello, due to too long SIM cable interface and radio interferences or not reliable contacts the module can detect that SIM is ejected. After detection the module disables SIM interface. According to at spec - restart is suggested solution. I'd also recommend to review your hardware if hardware requirements from Hardware Interface Description are met. As a software solution you can setup ^SCKS URC to catch the moment of SIM ejection detection and restart the module after that. Regards Jedrzej
mdesortis's picture
mdesortis
Jul 11 2014 - 6:01pm
Hi Jedrzej, Thank You for the reply. One question: after I detect the SIM ejection event, how can I restart the module condidering that System is always placed into an unattended location? Maybe I can use a set of custom AT Commands to perform the reset,or it's necessary to disconnect/reconnect power supply? Thanks again.
Alopez's picture
Alopez
Jul 14 2014 - 1:41pm
Hi, You can perform a SW reset with at+CFUN=1,1 and wait until OK is received Or just HW reset using the pin /Emergency_OFF o just replug the power supply ( not recommended) Regards Alopez

Somewhere over the rainbow!!! Looking for the Oz Land!!!

Jędrzej Gemalto Moderator's picture
Jędrzej Gemalto...
Jul 14 2014 - 12:53pm
Hello, thanks Antonio for your suggestion. There is following note in Hardware Description: "Caution: Use the EMERGOFF pin only when, due to serious problems, the software is not responding for more than 5 seconds. Pulling the EMERGOFF pin causes the loss of all information stored in the volatile memory since power is cut off immediately. Therefore, this procedure is intended only for use in case of emergency, e.g. if MC55i fails to shut down properly." Replugging power supply also doesn't guarantee completion of flash writing operations. Due to that I'd recommend software reset. Regards Jedrzej
LORENZOC_AUTOMA's picture
LORENZOC_AUTOMA
Dec 2 2015 - 12:19pm

Hello,

I've got this situation: for an hardware configuration (that at the moment I can't modify it), my device normally provides 2V to the MC55i (in this period time the modem isn't used).

Every day it is switched on for some seconds  (in this period time, the modem power supply rises @ 4V) to communicate via GPRS.

In some devices I meet the problem of "SIM NOT INSERTED"

I'd like to know how can I solve this situation, because I can solve it only moving/removing the SIM.

Some questions:

  • which could be the cause?
  • Why removing the sim I can solve the situation?The modem SIM controller reboots?
  • @2V the SIM interface is completely off?I also checked the MC55i manual to understand if @2V the SIM interface it's completely switched off, but I'm not sure about this.

What can I do something via firmware to solve it (please, consider that I can't remove the power supply)?

  • perform a SW reset with at+CFUN=1,1 and wait until OK is received?
  • HW reset using the pin /Emergency_OFF?

Thank you Bests

Lorenzo

Bartłomiej Gemalto Moderator's picture
Bartłomiej Gema...
Dec 4 2015 - 11:10am

Hello,

Generally the power should be cut off when the module is turned off. Leaving 2V could cause some unexpected behaviour or damage. 

This 2V could be the cause of your problem. But the SIM tray connection hardware could also be the case. You should refer to the hardware description for details. The lines should not be too long. 

If removing and inserting the SIM helps that could mean that changing the state of CCIN line which detects the SIM card could also do the same.

How about the module reset - does it also help?

If you want to reset the module you should consider the software reset first. Emergency off or hardware reset is rather for emergency or if the software reset is not possible. Only software reset guaranties that the module will be properly switched off.

Regards,

Bartłomiej

Bartłomiej Gemalto Moderator's picture
Bartłomiej Gema...
Dec 4 2015 - 11:13am

Hello,

Generally the power should be cut off when the module is turned off. Leaving 2V could cause some unexpected behaviour or damage. 

This 2V could be the cause of your problem. But the SIM tray connection hardware could also be the case. You should refer to the hardware description for details. The lines should not be too long. 

If removing and inserting the SIM helps that could mean that changing the state of CCIN line which detects the SIM card could also do the same.

How about the module reset - does it also help?

If you want to reset the module you should consider the software reset first. Emergency off or hardware reset is rather for emergency or if the software reset is not possible. Only software reset guaranties that the module will be properly switched off.

Regards,

Bartłomiej