TC35i AT Command Set
4.11 AT+CMUX
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TC35i_ATC_V02.07 Page 103 of 439 1/30/04
Confidential / Released
4.11 AT+CMUX Enter multiplex mode
Syntax
Command Description
Multiplex mode according to the ETSI TS 101 669 and GSM 07.10 enables one physical serial asynchronous
interface to be partitioned into three virtual channels. This allows you to take advantage of up to 3 simultaneous
sessions running on the serial interface. For example, you can send or receive data or make a call on the first
channel, while the other two channels are free to control the module with AT commands.
The TC35i module incorporates an internal multiplexer and thus integrates all the functions needed to implement
full-featured multiplex solutions. For the application on top, customers have the flexibility to create their own mul-
tiplex programs conforming to the multiplexer protocol. To help system integrators save the time and expense of
designing multiplexer applications, SIEMENS AG offers WinMUX2k, a ready-to-use multiplex driver for Windows
2000 and Windows XP. Another approach is to develop customized solutions based on the sources of the
WinMux2k driver.
Refer to [4] which provides a detailed description of the multiplex architecture and step-by-step instructions of
how to install and configure the multiplex mode. The WinMUX2k driver and its source files can be supplied on
Test Command
AT+CMUX=?
Response(s)
+CMUX: (list of supported<mode>s)
OK
Read Command
AT+CMUX?
Response(s)
+CMUX: <mode>
OK
ERROR
+CME ERROR: <err>
Write Command
AT+CMUX=<mode>
Response(s)
OK
ERROR
+CME ERROR: <err>
PIN ASC0 MUX1 MUX2 MUX3
! % ! ! !
Reference(s)
GSM 07.07, GSM 07.10
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