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MC55 AT Command Set
4.8 AT+CMUX
Command
AT+CFUN
AT+CPMS
AT^SSDA
4.8.2
Second serial interface ASC1
The second serial interface ASC1 is intended as an auxiliary interface for applications which need multiple par-
allel access to the module (e.g. to query status information during a data call), but cannot use the GSM 07.10
multiplexing protocol. Therefore this interface offers limited functionality only.
•
No DTR, DSR, DCD, RING signals. These hardware lines do not exist. As a result, AT commands controlling
the behavior of these lines (
•
No Autobauding. The hardware is not capable of automatically detecting the baudrate on this interface, so
the AT command which selects autobauding (
•
No CSD calls, so all related AT commands cannot be used and return ERROR.
•
No fax calls, so all AT+F commands cannot be used and return ERROR.
•
No GSM 07.10 Multiplexer. if issued on the second interface
ASC1 is disabled when the multiplexer is enabled on the first serial interface ASC0. Yet, both ASC1 and the mul-
tiplexer channel 2 are using the same parameters, and thus, the same user defined profile (if any). As a result,
a user profile stored on multiplexer channel 2 takes effect on ASC1 after closing the multiplexer and starting up
ASC1. Likewise, a user profile stored on ASC1 will be loaded on multiplexer channel 2.
This may be a problem when ASC1 is not connected, but flow control (for example
the user profile on the multiplexer channel 2. In this case, flow control takes effect on ASC1, when the multiplexer
is switched off. If then for example a large amount of URCs is generated, their transmission might be stopped
due to the flow control. To avoid this problem we recommend that you do not activate flow control on multiplexer
channel 2 when you set up a user profile with
MC55_ATC_V01.05
Confidential / Released
Description
If the ME is in Multiplexer mode, it is not recommended to activate SLEEP mode
with
=
. The best approach to properly control SLEEP mode in this
AT+CFUN
<fun>
case is to issue the PSC messages described in [5], chapter "Power saving control
(PSC)".
Parameter
will be the same on all instances, but the settings of
<mem3>
and
may vary on each instance.
<mem2>
If one instance is set to
<da>
figured for
=0.
<mt>
,
,
) are not allowed and return ERROR.
AT&D
AT&C
AT&S
AT+IPR
.
AT&W
Page 102 of 469
=1 and
=1, then all other instances must be con-
<mt>
=0) is not allowed and returns ERROR.
=0 returns ERROR.
AT+CMUX
s
m
obile
<mem1>
1 or
3) is stored to
AT\Q
AT\Q
2/10/04
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