Black Box MD1640A Auto-Reliable Buffering $A, Enable/Disable Auto Reliable Fallback Character $F

	CHAPTER 5: Command Mode
	This command is for Originate mode only.
	Answer mode still accepts MNP or LAP-M.
#L3 Command	In the prior commands, the modems use a
	two phase process to establish a V.42
	connection (detection to establish whether
	the remote modem is also error correcting,
	and then protocol establishment to deter-
	mine parameters and to establish the error
	correction connection). If you know that
	the other modem is a V.42 error correcting
	modem, and you wish to use LAP-M, the
	#L3 command disables the detection phase
	and goes directly to protocol establishment.
	Both modems must have #L3 in effect.

Auto-Reliable Buffering $A

In Auto-Reliable mode, the modem is given four seconds to establish a Reliable connection. After this four-second period, the modem drops to Normal mode. Any data which is received during this period is typically discarded. The $A command can be used to cause the modem to buffer (save) data that is received during this Auto-Reliable time-out period. This data will then be output by the modem after the

CONNECT message.

AT$A0 = Discard data received during auto-reliable time period.

AT$A1 = Buffer data received during auto-reliable time period.

The factory default is $A0.

Enable/Disable Auto Reliable Fallback Character $F

In Auto-Reliable mode, the modem is given four seconds to establish a Reliable connection. If a single CARRIAGE RETURN is received from the remote modem during this four second period, the Auto-Reliable modem assumes that the remote modem is not in Reliable mode and drops to Normal ( non-error correcting) mode. The CARRIAGE RETURN is the only character which causes the modem to drop to Normal mode. Any other character will either be buffered or discarded.

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