Multi-Tech Systems MT3334ZDXV Echo Online Data Characters, On-Hook/Off-Hook Control

		3 - AT Commands, S-Registers and Result Codes
Command:	Fn	Echo Online Data Characters
Values:	n = 1
Default:	1
Description:	F0	Enable online data character echo. (Not supported.)
	F1	Disable online data character echo (included for
		backward compatibility with some software).
Command:	Hn	On-Hook/Off-Hook Control
Values:	n = 0 or 1
Default:	0
Description:	H0	Go on-hook to hang up.
	H1	Go off-hook to make the phone line busy.
Command:	In	Information Request
Values:	n = 0–4
Default:	None
Description:	I0	Display default speed and controller firmware
		version.
	I1	Calculate and display ROM checksum (e.g.,
		“12AB”).
	I2	Check ROM and verify the checksum, displaying
		OK or ERROR.
	I3	Display default speed and controller firmware
		version.
	I4	Display firmware version for data pump (e.g., “94”).
Command:	Ln	Monitor Speaker Volume
Values:	n = 0, 1, 2, or 3
Default:	2
Description:	L0	Select low volume.
	L1	Select low volume.
	L2	Select medium volume.
	L3	Select high volume.
Command:	Mn	Monitor Speaker Mode
Values:	n = 0, 1, 2, or 3
Default:	1
Description:	M0	Speaker always off.
	M1	Speaker on until carrier signal detected.
	M2	Speaker always on when modem is off-hook.
	M3	Speaker on until carrier is detected, except while
		dialing.

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