Motorola G24 用户手册
MUX State
B-2
AT Commands Reference Manual
December 31, 2007
MUX State
Entry to state:
•
When the G24 receives the SABM0 frame.
Exit from state:
•
When the DTE requests the G24 to return to the PREMUX State.
Software Procedures Related to RS232 HW Lines
RI Hardware Line
•
PREMUX state: There is no change to the current RI line behavior.
•
MUX-Init state: The RI line becomes inactive.
•
MUX state: There is no change to the current RI line behavior.
DCD Hardware Line
In MUX and MUX-Init states, the DCD is always inactive. This line is not used within the MUX.
DTR Hardware Line
The procedure upon DTR interrupt is dependent on the AT&D settings in PREMUX state (GRLC
profile). In general, the DTR is always active.
profile). In general, the DTR is always active.
If the PREMUX AT&D setting is 4 and the DTR is toggled while the G24 is in MUX or
MUX-INIT state, the G24 will return to PREMUX state. Upon its return, the G24 will release any
call (GPRS, CSD) except for a voice call.
MUX-INIT state, the G24 will return to PREMUX state. Upon its return, the G24 will release any
call (GPRS, CSD) except for a voice call.
Note:
If the PREMUX AT&D setting was not 4, the G24 ignores the DTR without any
operation. The AT&D4 will be supported in future releases.
operation. The AT&D4 will be supported in future releases.
G24 DTR Interrupt
When G24 changes its state from PREMUX to MUX-Init, the G24 will disable the DTR interrupt
(since there is no need to use the DTR line) if its AT&D (of the GRLC profile) value is not 4.
(since there is no need to use the DTR line) if its AT&D (of the GRLC profile) value is not 4.
When G24 changes its state to back to PREMUX, it re-enables its DTR interrupt.
DSR Hardware Line (Optional)
The DSR is always active in MUX state.