Siemens MC35 User Manual
Page 87
AT Command Set
MC35_ATC_01_V03.02
Page 87 of 228
13.03.2002
Command
Behaviour on channel 1
Differences on channel 2+3
ATS4
1
)
as described
as described
ATS5
1
)
as described
not usable
ATS6
1
)
as described
not usable
ATS7
1
)
as described
not usable
ATS8
1
)
as described
not usable
ATS10
1
)
as described
not usable
ATS18
1
)
as described
not usable
AT\Q
as described
not usable
ATZ
as described
data call parameters not changed
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 pg. 25). The other registers are
read-only and for internal use only!
2)
MC35 allows to use the GPRS commands on all logical channels, but to remain compatible to fu-
ture releases it is recommended to use them on channel 1 only. 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 data calls can be
initiated on any channel but will be always established on channel 1.
Table 7: Summary of AT commands with different behaviour in Multiplex mode
Command
Description
Chapter
ATH
Terminates any call in progress, no matter what channel was used to
enter ATH
AT&V
Different default configurations on channels 1, 2 and 3
AT+IPR
Before you start Multiplex mode, it is recommended to set the ME to
57600 bps, especially if you want to use all the three channels. Once
it is activated, the bitrate on channels 2 + 3 should be set to 19200
bps.
AT+IPR=0
Autobauding is not compatible with Multiplex mode. It is neither pos-
sible to start MUX when autobauding is active, nor to set autobauding
during Multiplex mode.
AT+CALA
Alarm calls can be separately configured on each channel. The read
command returns the total number of alarm calls activated 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 channels, 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 pa-
rameter for
zero.
If either a SM or a Status Report is not acknowledged, all +CNMI pa-
rameter will be set to zero on all channels.