Motorola V.3600 manual Bit Mapped S27, Lookback Timer S28, Bit Mapped S29

Status Registers

Bit Mapped — S27

Bit	Value	Command	Description
1,	00	&M	Async
0	01	&M1	Sync data / async dial
	10	&M2	Sync data / dial through DTR
	11	&M3	Sync data / manual dial
2	0	&L	Dial-up line
	1	&L1 and	Leased line
		&L2
3	--	--	Reserved
5,	00	&X	Internal clock
4	01	&X1	External clock
	10	&X2	Receive clock
	11	--	Not used
6	1	--	Enable async DTR dialer
	0		Disable async DTR dialer
7	--	--	Reserved

Lookback Timer — S28

The S28 register specifies the amount of time in 1.0 minute increments that the modem will remain in dial backup mode before retrying leased line mode. A zero will disable automatic lookback to leased line. The default value is 15 minutes.

Bit	Value	Command	Description
7-	0-255	--	Time in 1 minute increments (0=disabled)
0

Bit Mapped — S29

Bit	Value	Command	Description
0	0	*NT1	Enable AT command set
	1	*NT	Disable AT command set
1	0	*RO	Options retained at disconnect
	1	*RO1	Options restored at disconnect
2	0	*FT	Disable V.32 fast train
	1	*FT1	Enable V.32 fast train

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