Wavecom GX64 GSM 27.010 Multiplexer Feature Application Note - page 13
6
Application Design Considerations
When designing a host application that uses MUX, following have to be taken into
considerations up front.
6.1 Local and Global Settings
Integrators must take local and global settings into consideration when designing
host application that utilizes MUX. AT commands with settings are identified as either
global or local under “Parameter Setting” of the AT commands characteristic table in
the AT commands manual [2]. For example the table for +CNMI is as follows.
Command
Long
SIM
Parameter Affected
Works Works
CFUN
by &F,
with
with
Abortable Execution Required Setting
Modes
&W
USB
MUX
No
No
Yes
Local
Yes
Yes Yes
1,4,5
Under “Parameter Setting”:
Local - means that a change to the setting will only take affect in the channel where
the change was made. For example, if the user has 2 MUX channels active, and
make a change to a Local parameter on one MUX channel, the other MUX
channel would not see the change. One example is the AT+CNMI setting.
Global - means that if a change to a setting is made on any channel, all channels will
see the affect of the change. For example, if a change is made on one MUX
channel, any other active MUX channel would also experience the change. One
example is the AT+CGDCONT setting.
ATZ, AT&V and AT&W allow the user to restore, view and store the current profile
parameters in non-volatile memory. AT&Y specifies which profile gets loaded on
start-up of GR/GS64 wireless CPU. In the MUX mode, the last channel that executes
the AT&W command has its local setting stored which is persistent through power
cycle.
Most of the unsolicited responses (such as +CREG, +CGREG, +CGEV, +CMTI, +CIEV,
*ECIND) are “local” to a channel. They are only outputted in channels that have the
unsolicited responses turned on. For example for two active MUX channels, if only
channel one has AT+CREG=1 or AT+CREG=2 set, +CREG unsolicited response only
get outputted in channel one. On the other hand, unsolicited response “RING” or
“+CRING” (depending on the AT+CRC setting) comes out of all MUX channels.
Gx64 APPLICATION NOTE
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27.010 MUX Feature
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