Multi-Tech Systems MT5600BL User Manual download pdf (Page 47)

4 AT Commands, S-Registers, and Result Codes

Command: &G

V.22bis Guard Tone Control

Values: n = 0, 1, or 2

Default: 0 (North America), 2 (elsewhere)

Description: &G0 Disables guard tone.

&G1 Sets guard tone to 550 Hz.

&G2 Sets guard tone to 1800 Hz.

Note: The &G command is not used in North America, and

may not be permitted in some countries.

Command: &K

Flow Control Selection

Values: n = 0, 3, 4, 5, or 6

Defaults: 3 (data modem mode)

6 (fax modem and voice modes)

Description: &K0 Disables flow control.

&K3 Enables CTS/RTS hardware flow control.

&K4 Enables XON/XOFF software flow control.

&K5 Enables transparent XON/XOFF flow control.

&K6 Enables both RTS/CTS and XON/XOFF flow control.

Note: See also the &E command

Command: &M

Communications Mode

Values: n = 0–3

Default: 0

Description: This command determines the DTR operating mode. The mo-

dem treats the &M command as a subset of the &Q command.

&M0 Selects direct asynchronous operation. Note that the command

sequence &M0\N0 selects normal buffered mode, but the

command sequence \N0&M0 selects direct mode. This is be-

cause the \N0 command is analogous to the &Q6 command.

&M1 Selects synchronous connect mode with asynchronous offline

command mode.

&M2 Selects synchronous connect mode with asynchronous offline

command mode. Same as &M1 except that &M2 enables DTR

dialing of directory slot 3. The modem disconnects if DTR is

low for more than the period stored in S25.

&M3 Selects synchronous connect mode. This mode allows DTR to

act as a talk/data switch. The call is manually initiated while

DTR is inactive. When DTR becomes active, the handshake

proceeds in originate or answer mode according to S14 bit 7.

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Multi-Tech Systems MT5600BL User Manual Page 47