Siemens MC55 manual ATS6, ATS7, ATS8, ATS10, ATS18

MC55 AT Command Set

4.8 AT+CMUX

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Command	Behavior on channel 1	Behavior on channel 2+3
ATO	as described	not usable
	as described	not usable
ATS6 1)
ATS7 1)
	as described	not usable
ATS8 1)	as described	not usable
ATS10 1)	as described	not usable
ATS18 1)	as described	not usable

1)Siemens GSM engines support the registers S0 - S29. You can change S0,S3,S4,S5,S6,S7,S8,S10 and S18 using the related ATSn commands (see starting from ATS0). The other registers are read-only and for internal use only!

2)The applicability of the +++ escape sequence depends on the customer's external application based on the Mulitplexer Protocol. Recommendations for implementing an appropriate modem status command (MSC) are provided in [5], Chapter "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.

Table 4.2:	Summary of AT commands with Different Behavior in Multiplex Mode
Command	Description
AT\Q	It is recommended to use hardware flow control (AT\Q3). XON/XOFF flow control
	(AT\Q1) is not supported in Multiplex mode.
	See note regarding AT\Qn settings stored with AT&W if Multiplex mode is active.
AT&V	Different default configurations on channels 1, 2 and 3.
AT&W	Different user profiles can be stored on each channel.
AT+IPR	Before you start Multiplex mode, it is recommended to set the ME to 57600 bps
	(minimum should be 4800 bps). For GPRS we suggest to use 115200 bps or
	230400 bps.
	In Multiplex mode, the write command AT+IPR=<rate> will not change the bit rate
	currently used, but the new bit rate will be stored and becomes active, when the
	module is restarted.
AT+IPR=0	Multiplex mode cannot be activated while autobauding is enabled.
AT+CALA	On each channel an individual <text> message can be stored. but only one time
	setting applies to all channels. This means an alarm <time> set on one of the
	channels overwrites the time setting on all remaining channels. Therefore, the total
	number of alarm events returned by the read command AT+CALA? will always be
	<n>=0, no matter whether individual text messages are stored.
	When the alarm is timed out and executed the ME sends the URC only on the
	channel where the most recent alarm setting was made. The alarm time will be
	reset to "00/01/01,00:00:00" on all channels.
AT+CMEE	Presentation mode can be separately configured for each channel.
AT+CNMA	If Multiplex mode is activated the +CNMI parameter will be set to zero on all chan-
	nels, if one channel fails to acknowledge an incoming message within the required
	time.
AT+CNMI	Phase 2+ parameters can only be used on one channel. The parameter for <mt>
	and <ds> on the other channels have to be set to zero. If either a SM or a Status
	Report is not acknowledged, all +CNMI parameter will be set to zero on all chan-
	nels.

MC55_ATC_V01.05	Page 101 of 469	2/10/04
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