At+creg? questions

#1

Hi, I like to find out what the various response fields mean when I issue a AT+CREG? command to a EM7455 module.

Before issuing a AT!SCACT=1,1 command to start a data connection, the response to a AT+CREG? command is:

+CREG: 0, 1

After issuing a AT!SCACT=1,1, followed by dhcpd, the response to a AT+CREG? command is:

+CREG: 2,1,“FFFE”,“8684797”,7

And with active data connection going, if I issue AT+CREG=0, AT+CREG=1, AT+CREG=2 commands, I see sporadic responses that look like:

+CREG: 1,“FFFE”,“872C308”, 7

What do the various response fields mean?

I am using a AT&T card in USA.

Thanks a lot!!

#2

Please refer to 3GPP TS 27.007 AT command set for User Equipment below for details.

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