Multi-Tech Systems MT2834ZPX - Manual (Page 29)

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Chapter 4 - AT Commands, S-Registers and Result Codes
COMMAND: $Fn
VALUES: n = 0 or 1
DEFAULT: $F1
DESCRIPTION:
$F0 selects do not fall back to normal
connect if CR received.
$F1 selects fall back to normal connect if CR received.
COMMAND: &Gn
VALUES: n = 0, 1 or 2
DEFAULT: &G0
DESCRIPTION:
&G0 turns off CCITT guard tones.
&G1 turns on CCITT 550 Hz guard tone.
&G2 turns on CCITT 1800 Hz guard tone.
(Not used in International models.)
COMMAND: Hn
VALUES: n = 0 or 1
DEFAULT: n/a
DESCRIPTION:
H0 selects Hang Up (go on hook).
H1 selects Go Off Hook.
COMMAND: $Hn
VALUES: n = 1 thru 3
DEFAULT: Read Only Command
DESCRIPTION:
$H1 selects Help Screen #1.
$H2 selects Help Screen #2.
$H3 selects Help Screen #3.
COMMAND: In
VALUES: n = 0,1, 2, 3 or 5
DEFAULT: Read Only Command
DESCRIPTION:
I0 requests modem ID #.
I1 requests firmware revision #.
I2 for Model of modem.
I3 MTS internal use.
I5 outputs DSP version.