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APPENDIX A. AT COMMANDS
ACTIVE Professional External Modem User’s Manual
17
AT&K4
Enables XON/XOFF flow control
AT&K5
Enables transparent XON/XOFF flow control
AT&K6
Enables both RTS/CTS and XON/XOFF flow control
(Default for fax mode)
AT&Ln *
Transmission line type
Default : 0
AT&L0
Dial-up line
AT&L1
2-wire Leased line (Option)
AT&L2
4-wire Leased line(Option)
AT&Mn *
Communication mode
Same as AT&Q0-3
AT&Pn *
Dial pulse ratio
Default : 0
AT&P0
39%/61% make/break ratio @ 10pps
AT&P1
33%/67% make/break ratio @ 10pps
AT&P2
39%/61% make/break ratio @ 20pps
AT&P3
33%/67% make/break ratio @ 20pps
AT&Qn *
Communication mode
Default : 5
AT&Q0
Selects direct asynchronous operation
AT&Q1
Selects synchronous mode 1 operation
AT&Q2
Selects synchronous mode 2 operation
AT&Q3
Selects synchronous mode 3 operation
AT&Q4
Selects autosync operation
AT&Q5
Selects error correction mode
AT&Q6
Selects asynchronous operation in normal mode
AT&Rn *
RS232-C RTS/CTS option
Default : 0
AT&R0
CTS tracks RTS, CTS is turned ON in response to an OFF-
to-ON transition of RTS from the local DTE after a delay
period specified by register S26 in increments of 10
milliseconds.
AT&R1
The modem ignores RTS, CTS is held ON unless AT&K3
has been selected
AT&Sn *
RS232-C DSR option
Default : 0
AT&S0
DSR is always ON
AT&S1
DSR operates in accordance with the EIA-232-C
specification
AT&Tn *
Test and diagnostic
Default : 4
A test can be run only when in an asynchronous operation in non-error
correction mode (normal or direct mode). To terminate a test in
progress, the escape sequence must be entered first, except for
parameters 7 and 8. If S18 is non-zero, a test will terminate
automatically after the time specified by S18 and display the OK
message.