BGS2T AT Command Set
4.8 AT+CMUX
BGS2T_ATC_V01.301
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4.8
AT+CMUX Multiplex mode
Multiplex mode according to 3GPP TS 27.010
enables the use of virtual channels set up over one single serial
interface. Every channel is used as an independent serial link. This way, up to three simultaneous AT command
sessions can be handled at a time. For example, the first Mux channel can be used to send or receive data, while
two Mux channels are available to control the module with AT commands or to establish a dedicated channel to
receive Unsolicited Result Codes (URC), e.g. "+CIEV:" or "RING".
BGS2T incorporates an internal multiplexer and thus integrates all the functions needed to implement full-fea-
tured multiplex solutions. For the application on top, customers have the flexibility to create their own multiplex
programs conforming to the multiplexer protocol. To help system integrators save the time and expense of
designing multiplexer applications, Cinterion Wireless Modules GmbH offers WinMUX, a ready-to-use multiplex
driver for Windows XP, Windows Vista and Windows 7. Another approach is to develop customized solutions
based on the sources of the WinMUX driver.
Refer to
which provides a detailed description of the multiplex architecture and
step-by-step instructions of how to install and configure the Multiplex mode. The WinMUX driver and its source
files can be supplied on request. Please contact your local distributor to obtain the latest installation software and
user's guide.
write command is used to enter Multiplex mode. Setup of the logical channels is initiated by the TE,
i.e. the TE acts as initiator. This means that the TE shall ensure that logical channels are established before any
further actions on the channels can be started. There is a timeout of five seconds, if the multiplexer protocol is
enabled but no multiplexer control channel is established. Afterwards BGS2T returns to AT command mode.
The parameter maximum frame size (N1) according to 3GPP TS 27.010
is implemented as 98 bytes by
default. All other parameters are not available. Refer to
for further details regarding
frame size.
Syntax
Test Command
AT+CMUX=?
Response(s)
+CMUX:
(list of supported
OK
Read Command
AT+CMUX?
Response(s)
+CMUX:
OK
ERROR
+CME ERROR:
Write Command
AT+CMUX=
Response(s)
OK
ERROR
+CME ERROR:
PIN ASC0 MUX1 MUX2 MUX3
Last
Reference(s)
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3GPP TS 27.007
3GPP TS 27.010
Confidential / Released