sazary
Newbie level 3
Hi
we're trying to build a device using NXP LPC1768 as the main micro controller and SimCom SIM900 as the GSM module.
sim900 turns on and net status light starts blinking with a 64/800ms rate, which is indicating that it has not registered on the net. these are the commands we send and their responses:
i should note that the sim card needs no PIN, has charge, and works in a functioning phone.
we are using a 1.8v sim card, and the odd thing is that when we probe pin 30 of sim900, which is SIM_VDD, we see 1.2V. i don't know where should we examine to find the problem, and your help is greatly appreciated.
thanx
we're trying to build a device using NXP LPC1768 as the main micro controller and SimCom SIM900 as the GSM module.
sim900 turns on and net status light starts blinking with a 64/800ms rate, which is indicating that it has not registered on the net. these are the commands we send and their responses:
Code:
AT&F
OK
AT
OK
AT+CFUN=1
OK
AT+CFUN?
+CFUN: 1
OK
AT+CPIN?
+CME ERROR: SIM not inserted
AT+CSPN?
+CME ERROR: SIM not inserted
AT+CSMINS?
+CSMINS: 1,0
OK
AT+COPS=?
+COPS: (1, "Iran Taliya","Taliya","43232"),(1,"IR-TCI","432 11","43211"),(1,"MTN Irancell","Irancell","43235"),,(0,1,4),(0,1,2)
OK
AT+COPS?
+COPS: 0
OK
AT+CREG=2
OK
AT+CREG?
+CREG: 2,0
OKi should note that the sim card needs no PIN, has charge, and works in a functioning phone.
we are using a 1.8v sim card, and the odd thing is that when we probe pin 30 of sim900, which is SIM_VDD, we see 1.2V. i don't know where should we examine to find the problem, and your help is greatly appreciated.
thanx
Last edited:
