PHS8 CME Error 10 (Sim not inserted) even though it is in | Telit Cinterion IoT Developer Community
November 7, 2019 - 6:28am, 3574 views
In rare cases our PHS8-E based modems lose their connection in the field. The modem then remains offline, until the SIM card is unplugged and replugged. Resetting the modem by software (AT+CFUN=1,1) or switching off the power supply for a longer time does not help. The only thing that helps is to toggle the CCIN pin, which is not possible remotely. The CME ERROR 10 (no SIM) is always output, the CCIN PIN shows the correct and stable level wieh doing a direct measurement. The signal is directly connected to the PHS8-E without any detours, and the correct signal is also applied to the pad of the modem.
Is such an effect known? If so, what could be a solution?
Hello,
Does it happen to all or many modules or just a single one?
Does it happen while the module is connected, on start, airplane **** etc., are there any special circumstances observed while it happens?
The description suggests that this might have something to do with the SIM interface. As I understand you have CCIN connected. And how about ESD protection? On the other hand if disconnecting the powed does not help that might suggest that the module somehow remembers the last state and only reacts on state change. But I'm not a hardware guy, I'd need to consult this.
Maybe you could try to switch the module into minimum functionality level with AT+CFUN=0 command (accordding to AT commands specification it should then switch off the USIM interface) when this problem happens and then back to normal functionality with AT+CFUN=1.
Regards,
Bartłomiej
Hello,
It happens while the module is connected. The units usually run 24/7. We do not see any pattern in occurrence. I am sure it has something to do with SIM interface, though as written before only removal and reinserting the SIM card resolves the issue. And if there ws an ESD probem (the signals are protected), then it wouldn't work after the SIM card has been taken out and reinserted.
We will do a test with the AT+CFUN=0 you suggested.
Regards,
Andreas
Hello,
It's really weired. If we suspect the module, powering off and on would most probably help especially if it's powered off for a longer period. So the SIM interface is the main suspect. Bu if measure the CCIN state as correct while this problem happens... nothing is obvious.
BTW you probably don't have the possibility to measure it directly on the module's pad. What's the exact value? Did you try with the oscilloscope?
Anyway it seems more probable that there's something with the SIM interface. And CFUN might not help in that case but it's always worth to try.
Regards,
Bartłomiej