MC55i-W and CREG 0,3 | Telit Cinterion IoT Developer Community
July 13, 2018 - 2:22pm, 5835 views
Hi
I have registration problem. CREG 0,2 go to CREG 0,3.
AT+CGMM >>> MC55i-w
AT+GMR >>> REVISION 1.301
AT^SCKS? >>> ^SCKS: 0,2
length wire to SIM *** 23mm.
The 3 modules bought a month ago work well. (CREG 0,1)
7 module purchased now does not register. (CREG 0,3)
Please help.
Thank you Fanda
Hello,
This status means registration denial. Have you tested all modules with the same SIM card?
Is it possible that the modules IMEI numbers are not allowed in this network for any reason?
Please execute AT+CEER command to check if there is any error report available.
Regards,
Bartłomiej
Hi
Is it possible that the modules IMEI numbers are not allowed in this network for any reason?
no sometimes he registers for a moment and falls back
Please execute AT+CEER command to check if there is any error report available
CEER reports ERROR
AT^SMONC ERROR
AT+CSQ CSQ: 27,99
AT+CPAS +CPAS: 0
AT+CREG? +CREG: 0,3
AT^SCKS? ^SCKS: 0,2
AT+CEER ERROR
Hello,
The reply to AT^SCKS? shows that the SIM interface has been switched off. And this indeed suggests a hardware problem. It seems that there probably is some communication with SIM as the module registers for a moment sometimes. But then for some reason the communication probably fails and the interface is switched off. And the network rejection might be a consequence of that.
If the reply to AT+CEER is just ERROR it seems like this command is not supported. Can you check the firmware version with ATI1 command?
How about the SIM card - maybe it is damaged. Do you use the same SIM for testing of new and old modules? And how about the hardware? Is it the same piece of hardware?
So hardware design might need some review.
Are these really the same modules from the same supplier?
Regards,
Bartłomiej
hi
The reply to AT^SCKS? shows that the SIM interface has been switched off. And this indeed suggests a hardware problem. It seems that there probably is some communication with SIM as the module registers for a moment sometimes. But then for some reason the communication probably fails and the interface is switched off. And the network rejection might be a consequence of that.
YES
If the reply to AT+CEER is just ERROR it seems like this command is not supported. Can you check the firmware version with ATI1 command?
in the normal state CEER reply 0,0,0 only in CREG 0,3 reply CEER error.
AT+GMR REVISION 01.301 OK for all modules
How about the SIM card - maybe it is damaged. Do you use the same SIM for testing of new and old modules? And how about the hardware? Is it the same piece of hardware?
YES different cards from different operators
So hardware design might need some review.
YES But I do not know where to look.SIM interface is simple and signal's ok.
Power looks good 4.4V - 200mVpp.Serial interface directly to processor.
Mosfet between IGT and GND.Emergency not connection.This is all.
Are these really the same modules from the same supplier? YES
Thank you
Hello,
Switching off the SIM interface could usually mean some design or quality problem like cross-talk between lines, incompatibility of SIM card, lines too long etc. which finally leads to communication failure and then the interface is switched off. So you might need to oscilloscope the signals.
Are you using the same hardware sample for testing all modules? Please also compare ATI1 replies and stickers on the modules - are there any differences?
Regards,
Bartłomiej
according to the oscilloscope are signaly perfect.Maximal length is 25mm.
In another application I have also done a multiplex of 12 SIM on 6 Module (20cm lines) and everything was in order.
Apply now for about a week well (with occasional dump). ????
I'll get them back from the buyer on Monday.
So you are currently implementing multiple SIM interfaces for one device or it was in a previous project only?
If the interface is switched off by the module there must be a reason, some kind of communication failure.
not just one sim cadr in one system.
is it possible to find out from the module what is the fault? Some errors massage?
On the module you can only check AT+CEER to see reports for network related errors. You can watch the signals with an oscilloscope or try some SIM interface tracer to see what's inside.