Multitech MultiModem MT5600ZDX User Manual page 32

4 AT Commands, S-Registers, and Result Codes
Command: &J Telephone Jack Control
Description: This command is supported for compatibiltiy only and
performs no function in this modem.
Command: &K n 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: &P n Make/Break Dial Ratio
0, 1, 2, 3
Values:
Default: None
Description: &P0 Make/Break dial ratio of 39/61 at 10 pps
&P1 Make/Break dial ratio of 33/67 at 10 pps
&P2 Make/Break dial ratio of 39/61 at 20 pps
&P3 Make/Break dial ratio of 33/67 at 20 pps
&Q n Asynchronous Communications Mode
Command:
Values: n = 0, 5, 6
Default: 5
Description: This command is used to control which connection modes are
permitted. It is used in conjunction with S36 and S48. (See also
the \N command).
&Q0 Selects asynchronous operation with no data buffering and no
error correction. Same as N0.
&Q4 Selects Auto Sync operation. The value 100b is written to S27
bits 3, 1, and 0, respectively. Auto Sync operation, when used
in conjunction with compatible software in the DTE, provides
synchronous communication capability from an asynchronous
terminal.
Starting Auto Sync: Set registers S19, S20, and S25 to the
desired values before selecting Auto Sync operation with &Q4.
After the CONNECT message is issued, the modem waits the
period of time specified by S25 before examining DTR. If DTR
is on, the modem enters the synchronous operating site; if DTR
is off, the modem terminates the line connection and returns to
the aysnchronous command state.
Stopping Auto Sync: Auto Sync operation is stopped upon
loss of carrier or the on-to-off transition of DTR. Loss of carrier
will cause the modem to return to the asynchronous command
state. An on-to-off transition of DTR will cause the modem to
return to the aysnchronous command state and either not
terminate the line connection (&D1 active) or terminate the
line connection (any other &Dn command active).
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