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AC75 AT Command Set

4.10 AT+CMUX

AC75_ATC_V01.002 Page 121 of 569 10/30/06

Confidential / Released

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.

AT+CFUN If the ME is in Multiplexer mode, it is not recommended to activate SLEEP mode

with AT+CFUN=<fun>. The best approach to properly control SLEEP mode in this

case is to issue the PSC messages described in [6], Section "Power saving control

(PSC)".

AT+CPMS Parameter <mem3> will be the same on all instances, but the settings of <mem1>

and <mem2> may vary on each instance.

AT^SSDA If one instance is set to <da>=1 and <mt>=1, then all other instances must be con-

figured for <mt>=0.

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