AC International MTA128ST-USB manual S30, S31, S34

Chapter 4 - AT Commands, S-Registers, and Result Codes

S-register:	S30
Function:	On-line Inactivity Timer
Unit:	1 minute
Range:	n=0 Does not disconnect
	n=1–255
Default:	0 (does not disconnect)
Description: Makes the TA disconnect a data connection if no data is transmitted or
	received for the specified time. It will NOT cause a POTS call (voice/modem/
	fax) to disconnect. The timer restarts any time a data character passes
	through the serial port (either sent or received). Disable the inactivity timer
	by setting S30=0, which is the factory default setting. S30 currently works for
	+ all protocols EXCEPT V.110.

S-register:	S31
Function:	Maximum Redial Timeout Value
Unit:	1 minute
Range:	n=0 Does not try to redial
	n=1–255
Default:	30 (30 minutes)
Description: Sets the maximum redial timeout value for attempts to add a second channel to a
	MLPPP data call. Once the maximum timeout is reached, there are no further attempts
	to redial. Re-dialing occurs if a call attempt fails due to the host being busy or not
	answering. The first redial timeout period is 1 minute. If re-dialing fails after 1 minute,
	the next redial timeout is 3 minutes. If re-dialing fails after 3 minutes, the next redial
	timeout is 5 minutes. If re-dialing fails after 5 minutes, subsequent redial timeouts occur
	every 5 minutes, up to the maximum redial timeout value (S31).
S-Register: S32
Function:	Escape Sequence Timeout
Unit:	100 ms
Range:	0–255
Default:	20

Description:Sets the time allowed in an escape sequence from the receipt of the A in AT to the receipt

	of the carriage return. If the S32 time interval expires before you press ENTER, the
	escape sequence ends. The default time is 2 seconds.
S-Register:	S34
Function: Maximum Escape Sequence Length
Unit:	Decimal ASCII code
Range:	0–10
Default:	2

Description:Sets the maximum character length of the escape sequence, not including +++AT. For example, a character length of S34=2 allows two characters after +++AT (e.g.,

+++ATH0). Conversely, an invalid escape sequence (too many characters placed in the command string) passes through as data (e.g., +++atili2). The maximum length of the escape sequence is 10 characters.

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