Specifications

TC35i AT Command Set
Confidential / Released
TC35i_ATC_V01.05 Page 115 of 278 04.08.2003
· Multiplex mode requires character framing to be set to 8 bits, no parity
and 1 stop bit. The setting can be made using AT+ICF (see Chapter
2.44).
4.28.1 Restricted use of AT commands in Multiplex mode
In multiplex mode, CSD and fax calls can only be set up on logical channel 1. Due to this restriction,
AT commands have a different behavior on channels 2+3 compared to channel 1. Several commands
are not available, others return different responses. This chapter summarizes the concerned com-
mands. For general rules and restrictions to be considered in Multiplex mode please refer to [4].
Table 13: Availability of AT commands on virtual channels
Command Behavior on channel 1 Differences on channel 2+3
+++ Usable
2)
no CSD calls
AT+CBST as described not usable
AT+CRLP as described not usable
ATL as described not usable
ATM as described not usable
AT+F.... (Fax commands) as described not usable
AT&S as described not usable
ATDI<n> as described not usable
ATO as described not usable
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\V 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 pg. 32).
2)
The applicability of the +++ escape sequence depends on the customer’s external application
based on the Mulitplexer Protocol. The WinMux2k driver uses the +++ escape sequence as de-
scribed in Chapter 2.2. Recommendations for implementing an appropriate modem status com-
mand (MSC) are provided in [4], Chapter “Escape Sequence”.