Specifications

AT Command Set

TC35-ATC-01-V02.10 Page 68/145 02.10 / 23.05.2001

4. There are different possibilities to switch from data mode to com-

mand mode:

a) Circuit 108/2 (DTR) changes from ON to OFF, reaction depends

on command at&d (caution: at&d0: TA ignores status on DTR).

b) The message Modem Status Command (MSC) for control chan-

nel is defined by the multiplexer protocol GSM07.10. MSC con-

veys V.24 signals. Bit 3 of Control Signal Octet is DTR, reaction

depends on command at&d (caution: at&d0: TA ignores status on

DTR).

5. The parameter maximum frame size (N1) of at+cmux in GSM07.07 is

fixed to 97, the parameter is not changeable. All other parameters

are not available.

6. Echo is disabled with the start of multiplex mode (see ATE, pg. 18).

Therefore echo is not available on logical channels: ATE0 responds

with OK, ATE1 responds with ERROR.

7. Multiplex mode can´t be activated if autobauding is active (+IPR=0,

see “AT+IPR Set fixed local rate”, pg. 31).

8. If multiplex mode has been entered, AT+IPR=<rate> is not possible.

9. Multiplex mode can be terminated with AT^SMSO (,AT^SMSO

Switch off mobile station" pg. 120). It has to be reestablished after

power-on.

4.25 AT+COPN Read operator names

Test command

AT+COPN=?

Response

Execute command

AT+COPN

TA returns the list of operator names from the ME. Each operator code

<numericn> that has an alphanumeric equivalent <alphan> in the ME

memory is returned.

Response

+COPN: numeric <numeric1>,long alphanumeric <alpha1><CR><LF>

+COPN:.....OK

If error is related to ME functionality:

+CME ERROR: <err>

Parameter

<numericn> string type; operator in numeric form; GSM location

area identification number

<alphan> string type; operator in long alphanumeric format; can

contain up to 16 characters

Reference

GSM 07.07

Note