Siemens MC55 AT manual AT+CMUX Enter multiplex mode, At+Cmux=?, At+Cmux?

4.8AT+CMUX Enter multiplex mode

All information provided in this section applies to the ASC0 interface only. The second interface ASC1 has no support of Multiplex mode.

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 MC55 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 [5] 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 request. Please contact your local distributor to obtain the latest installation software and user's guide.

Syntax

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>

Reference(s)

GSM 07.07, GSM 07.10

PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge  Last

! % ! ! ! ! ! ! %

Parameter Description

<mode>(num)

Multiplexer transparency mechanism

0 Basic option

<subset>(num)

Subparameters defined in GSM07.07 are adjusted for control and logical channels as follows

0 UIH frames used only (control channel)

MC55_ATC_V04.00	Page 95 of 475	3/17/06
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