I want to use the TRB142 as a replacement for Sierra Wireless GL7600. The device is connected to an embedded Linux device via RS232.
Communication and configuration shall be done by means of the PPP deamon, so I confgured the serial interface of the TRB142 to "Full control". Firmware is TRB1_R_00.02.06.1.
AT+CPIN? returns "READY".
For establishing an internet connection with the GL7600 i use the command sequence:
ATZ => OK
AT+CGACT=0,1 => OK
AT+CGDCONT=1,"IP","apn.global-m2m.net" => OK
AT+CGACT=1,1 => OK
ATDT*99***1# => CONNECT
If I try the same with the TRB142 I get:
ATZ => OK
AT+CGACT=0,1 => ERROR
AT+CGDCONT=1,"IP","apn.global-m2m.net" => ERROR
AT+CGACT=1,1 => ERROR
ATDT*99***1# => ERROR
Adding AT+CGATT=0 in the sequence with TRB142 shows:
ATZ => OK
AT+CGATT=0 => OK
AT+CGACT=0,1 => OK
AT+CGDCONT=1,"IP","apn.global-m2m.net" => OK
AT+CGACT=1,1 => OK
ATDT*99***1# => ERROR
What am I doing wrong?
What is the correct command sequence to set up a 4G connection via RS232 using AT commands?