AT Command Set
MC35_ATC_01_V05.00 Page 124 of 256 15.07.2002
Test command
AT+CREG=?
Response
+CREG: (list of supported <n>s) OK
Parameter
See write command
Read command
AT+CREG?
ME returns the URC presentation mode <n> and an integer <stat> that shows
the registration status of the ME. The location information elem ents <lac> and
<ci> are returned only when <n>=2 and ME is registered to the network .
Response
+CREG: <n>,<stat>[,<lac>,<ci>]
OK
or if an error occurs which is related to ME functionality:
+CME ERROR: <err> (for error text see Chapter 9.1.1. or set AT+CMEE=2)
Write command
AT+CREG=
[<n>]
Use the write command to select the type of URC. Two types of URCs are
available:
+CREG: <stat> if <n>=1. To be issued when the ME's network registrat ion
status changes
or
+CREG: <stat>[,<lac>,<ci>] if <n>=2. To be issued when ME's n etwork registra-
tion or network cell changes.
Response
OK
or if an error occurs which is related to ME functionality:
+CME ERROR: <err>
<err> 256 If <n> = 0: Attempt to set once again <n>=0 causes error
code 256.
If <n> > 0: Attempt to activate a URC mode that is already
active is acknowledged with OK.
Parameter
<n > 0 disable URCs
1 enable URC +CREG:<stat> to report status of network reg-
istration
2 enable URC +CREG:<stat>[,<lac>,<ci>] to report status of
network registration including location information. Please
note that optional parameters will not be displayed during
call.
<stat> 0 not registered, ME is currently not searching for new opera-
tor
1 registered, home network
2 not registered, but ME is currently searching for a new op-
erator
3 registration denied
4 unknown
5 registered, roaming
<lac> string type; two byte location area code in hexadecimal form at
(e.g. "00C3" equals 193 in decimal)
<ci> string type; two byte cell ID in hexadecimal format