mupptupp@hotmail.com:
> Hi there!
> I have a problem with my siemens Mc75 modem. The thing is that
> everyting is working on the development board. When i try the same code
> with the nessesary changes tha modem appears to hang when i enter pin
> code. Every AT command exept AT+CPIN=8822 works and replies correct
> data. But CPIN anwers nothing. We have seen on orchiloscope that there
> is a clock signal to the sim, but it stopes after approx 2 sek of
> communication with the sim,   there is also some communication going on
> when requesting SIM code. But the modem doesn aswer anything to the
> uart. I think that you must have AT+Cpin in you code to get connection
> to the internet, becouse else AT+CREG never comes.
> 
> 
> Have anyone experiensed the same problem or have any idea. Everything
> would be helpful.
> 
> /Regards 
> Martin Senior Deverloper 
> Lansen AB
> 

Do you have VSENSE and ISENS tied together? They also should be 
connected to VBATT (possibly VBATT->VSENS->res->ISENS). Most likely 
that's the problem (it bit me in the same fashion as you have 
described). Some earlier version of MC75 HW guide stated that those pins 
should be left open if unused, but that's not true.

Maciek.

Hi there!
I have a problem with my siemens Mc75 modem. The thing is that
everyting is working on the development board. When i try the same code
with the nessesary changes tha modem appears to hang when i enter pin
code. Every AT command exept AT+CPIN=8822 works and replies correct
data. But CPIN anwers nothing. We have seen on orchiloscope that there
is a clock signal to the sim, but it stopes after approx 2 sek of
communication with the sim,   there is also some communication going on
when requesting SIM code. But the modem doesn aswer anything to the
uart. I think that you must have AT+Cpin in you code to get connection
to the internet, becouse else AT+CREG never comes.


Have anyone experiensed the same problem or have any idea. Everything
would be helpful.

/Regards 
Martin Senior Deverloper 
Lansen AB