Motorola G24 Appendix B: MUX

June 30, 2008 AT Commands Reference Manual B-1
Appendix B: MUX
This appendix contains the following sections:
•PREMUX State, below
•Mux-Init State, below
•MUX State, Page -B-2
•Software Procedures Related to RS232 HW Lines, Page -B-2
PREMUX State
Entry to State
•When the G24 powers up.
Exit from state:
•When the DTE sends the +CMUX command to the G24 to start the MUX stack and the G24
acknowledges with an OK response. (The MUX-Init state then begins.)
MUX-Init State
This state has two phases:
•The 1st phase is the very short period when the G24 is getting ready to communicate with the
DTE over the MUX protocol.
•The 2nd phase is when the G24 is ready and is waiting for the DTE to begin using the MUX
protocol by sending a special low-level byte sequence (SABM0 frame).
Entry to state:
•When the G24 receives the +CMUX command and returns a success response (OK).
Exit from state:
•If a timeout occurs due to the failure of the G24 to receive the SABM0 frame after a
predefined interval. The G24 then returns to the PREMUX state. The interval is defined to 10
seconds.
•If the RS232 connection is closed, the G24 returns to the PREMUX state.
•After a SABM0 frame is received, the G24 moves on to the MUX state.