Siemens TC63 Benutzerhandbuch
TC63 AT Command Set
4.10 AT+CMUX
s
TC63_ATC_V00.490
Page 104 of 501
5/24/05
Confidential / Draft - Do not copy
Notes
• The write command is used to enter the multiplex mode. The setup of the logical channels is initiated by the
TE, i.e. the TE acts as initiator. This means that the TE shall ensure that logical channels are established
before any further actions on the channels can be started.
• There is a timeout of five seconds, if the multiplexer protocol is enabled and no multiplexer control channel is
established. The GSM engine returns to AT command mode.
in GSM 07.10 is fixed to 98 bytes and cannot be
changed. All other parameters are not available.
• Multiplexer mode requires character framing to be set to 8 bits, no parity and 1 stop bit. The setting can be
made using (
=3).
4.10.1 Restrictions on Multiplex mode
When the serial interface ASC0 is in multiplex mode, data and fax calls can only be set up on logical channel 1.
Due to this restriction, AT commands have a different behavior on channels 2+3 compared to channel 1. Several
commands are not available, others return different responses. This section summarizes the concerned com-
.
Table 4.1: Availability of AT Commands on Virtual Channels
1) Siemens GSM engines support the registers S0 - S29. You can change S0,S3,S4,S5,S6,S7,S8,S10 and S18 using the
). The other registers are read-only and for internal use only!
2) The applicability of the
Protocol. Recommendations for implementing an appropriate modem status command (MSC) are provided in
, Section
"Escape Sequence".
3) PDP contexts can be defined on any channel, but are visible and usable only on the channel on which they are defined
(thus it is not possible to define a context on channel 2 and activate it on channel 3). GPRS connections can be estab-
lished on two channels at a time.
lished on two channels at a time.
Command
Behavior on channel 1
Behavior on channel 2+3
not usable, but see note
2)
not usable, but see note
2)
as described
not usable
as described
not usable
AT+CG... (GPRS commands)
as described
see note
3)
AT+F... (Fax commands)
as described
not usable
as described
not usable
as described
no Data Calls
as described
no Data Calls
as described
not usable
as described
not usable
as described
not usable
as described
not usable
1)
as described
not usable
1)
as described
not usable
1)
as described
not usable
1)
as described
not usable
1)
as described
not usable