TC3x Multiplexer User's Guide
TC3x_UG_01_V03.10 -
Released
Page 28/50
10.01.2002
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A call can be answered or ended on every channel. See AT commands like ATD, ATA, ATH.
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The PC Mux environment can only be started once on a PC.
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XON/XOFF are not allowed in the multiplex mode (AT\Q2).
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When switching on the module after a firmware update we recommend to wait 5 seconds before
entering the first AT command.
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Fax calls are not supported when using the multiplexer.
The following table lists commands and features for which dependencies between the different
instances on the 3 channels may exist.
Example:
A data call is ongoing on channel 1. When answering an incoming voice call on channel 2 or 3 and
terminating it, the data call will be ended as well.
So the table is intended to remind the customer to be aware of possible dependencies when using the
listed commands/features on different channels. One way of avoiding the problems may be to dedicate
certain commands/features to certain channels or to assure, that the application avoids conflicts.
Access types valid for all channels
Call Control
Phonebook access
SIM Card access
RF settings
Time settings
ATZ, AT&F, AT&V, AT&W, AT+CEER, AT+CLCK
Network settings
Power save
Device locks
SMS read, write and delete
Baud rate settings
Access types for Channel 2 and 3 not disturbing other instances
URCs
RING voice calls
Read device information
Signal quality and monitoring
Table 4 gives an overview about events which may be ongoing on different channels independently.
7.3 Multiplexer control and signaling lines
For performance reasons the channels which are provided by MP have been realized as pure data
channels, not as virtual V.24-Channels with signaling and control lines. For this reason efforts are
needed on the application side to emulate the missing information.
Possibilities how to develop a virtual driver are shown in the following chapters. Differences and
restrictions in comparison to the unframed module are pointed out.
Table 3: Commands with possible channel dependencies
Table 4: Commands/Features without channel dependencies
