ZyXEL Communications U-336R/RE Command, Function and description, Status Registers & Result Codes

Command	bit	dec	hex	Function and description	Ref.
		25	19	62400 bps
		26	1A	41600 bps
		27	1B	31200 bps
		28	1C	24960 bps
		29	1D	20800 bps
		46	2E	921600 bps

Note: Only the speeds up to S20=15 are supported by auto speed detection.

S21=	bit	dec	hex	Bit mapped register.
	0	0	0	Maintain non-error control	*E0
				connection when modem
				error control handshake
				fails.
		1	1	Drop connection when	*E1
				modem error control
				handshake fails.
	1-2	0	0	Speaker always OFF.	M0
		2	2	Speaker ON until carrier is	M1*
				detected (default).
		4	4	Speaker always ON.	M2
		6	6	Speaker ON after last digit is	M3
				dialed out until carrier
				detected.
	3	0	0	DSR always ON.	&S0
		8	8	According to CCITT (see	&S1
				also S44.4, S41.5).
	4	0	0	CD always ON.	&C0
		16	10	CD tracks presence of data	&C1
				carrier (see also S38.3).
	5	0	0	CTS Follows RTS in	&R0
				synchronous mode.
				Response delay set in S26.

Status Registers & Result Codes 97