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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?

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Hi,

Please try using these commands instead:

ATD*99# or ATD*99***1#

As there are many devices that use AT commands - they're not always the same so it could be that the ones that you've used are some kind of Sierra's specific commands.

Please try using the commands above and see if it passes.

EB.

Best answer
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Hello ErnestasB,

Thank you for your response.

Changing that AT command did the trick.

Regards,

ctDeveloper