Quantum 560UF/L User Manual
Page 20
APPENDIX A. AT COMMANDS
ACTIVE Professional External Modem User’s Manual
16
a handshaking sequence, the call and answer can be aborted
by receiving any character from DTE.
AT&Cn *
RS232-C DCD option
Default : 1
AT&C0 DCD is ON regardless of the state of the data carrier from the
remote modem
AT&C1 DCD follows the state of the data carrier from the remote
modem
AT&Dn *
RS232-C DTR option
Default : 2
Determines actions taken by the modem in relation to the DTR signal of
the serial port.
The action for the event that follows DTR drop indicated in the
following table:
&D0
&D1
&D2
&D3
&Q0
NONE
2
3
4
&Q1
1
2
3
4
&Q2
3
3
3
3
&Q3
3
3
3
3
&Q4
1
2
3
4
&Q5
NONE
2
3
4
&Q6
NONE
2
3
4
1
Modem disconnects and sends OK result code
2
Modem goes into command mode if in data mode and
sends the OK result code
3
Modem disconnects, sends the OK result code, and disables
auto answer while DTR is off
4
Modem performs a warm start (i.e., same as ATZ command)
AT&Fn
Restore factory configuration
Default : 0
&F0
Recalls fa ctory default as V.42bis auto-reliable mode
&F1
Recalls factory default as MNP 5 auto-reliable mode
&F2
Recalls factory default as DIRECT mode
AT&Gn *
Set guard tone
Default : 0
AT&G0
No guard tone
AT&G1
550 Hz guard tone
AT&G2
1800 Hz guard tone
AT&Jn *
Telephone jack selection
Default : 0
This command is only included for compatibility and performs no function.
AT&J0
Performs no function
AT&J1
Performs no function
AT&Kn *
DTE/modem flow control
Default : 3
AT&K0
Disables flow control
AT&K3
Enables RTS/CTS flow control