APPENDIX A. AT COMMANDS

 

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.

ACTIVE Professional External Modem User’s Manual

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