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Chapter 5 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 44
Command: L Speaker Volume
Description: Sets the speaker volume control. The parameter value, if valid, is written to
S22 bits 0 and 1.
Default: 1
Defined Values: L0 Low volume.
L1 Low volume. (Default.)
L2 Medium volume.
L3 High volume.
Result Codes: OK
Otherwise ERROR
Command: M Speaker Control
Description: Selects when the speaker will be on or off. The parameter value, if valid, is
written to S22 bits 2 and 3.
Default: 1
Defined Values: M0 Speaker is always off.
M1 Speaker is on during call establishment, but off when receiving
carrier. (Default.)
M2 Speaker is always on.
M3 Speaker is off when receiving carrier and during dialing, but on
during answering.
Result Codes: OK
Otherwise ERROR
Command: &G Select Guard Tone
Description: Causes the modem to generate the guard tone selected by this command
(DPSK modulation modes only). The parameter value, if valid, is written to
S23 bits 6 and 7.
This command may not be permitted in some countries.
Default: 0
Defined Values: &G0 Disables guard tone. (Default.)
&G1 Disables guard tone.
&G2 Selects 1800 Hz guard tone.
Result Codes: <value> = 0 to 2
Otherwise ERROR
Command: &P Select Pulse Dial Make/Break Ratio
Description: Determines the make/break ratio used during pulse dialing. The default is
country-dependent. The parameter value, if valid, is written to S28 bits 3
and 4.
Default: 0
Defined Values: &P0 Selects 39%-61% make/break ratio at 10 pulses per second.
&P1 Selects 33%-67% make/break ratio at 10 pulses per second.
&P2 Selects 39%-61% make/break ratio at 20 pulses per second.
&P3 Selects 33%-67% make/break ratio at 20 pulses per second.
Result Codes: OK
Otherwise ERROR