At& commands – Comtrol RM-4 User Manual
Page 8
8 - RocketModem IV: 2000468 Rev. A
Hardware Installation and Specifications
AT& Commands
Xn
Extended Result Codes
X0
Ignores dial & busy tone. Sends CONNECT message when a
connection is established by blind dialing.
X1
Disables monitoring of busy tones; sends only OK, CONNECT,
RING, NO CARRIER, ERROR. If busy tone detection is enforced
and busy tone is detected, NO CARRIER will be reported instead
of BUSY. If dial tone detection is enforced or selected and dial tone
is not detected, NO CARRIER will be reported instead of NO
DIALTONE.
X2
Disables monitoring of busy tones. Sends only OK, CONNECT,
RING, NO CARRIER, ERROR, NO DIALTONE, and CONNECT
XXXX. If busy tone detection is enforced and busy tone is detected,
NO CARRIER will be reported instead of BUSY. If dial tone
detection is enforced or selected and dial tone is not detected, NO
CARRIER will be reported instead of NO DIALTONE.
X3
Enables monitoring of busy tones; sends only OK, CONNECT,
RING, NO CARRIER, ERROR, NO DIALTONE, and CONNECT
or CARRIER XXXX. If dial tone detection is enforced and dial tone
is not detected, NO CARRIER will be reported.
X4
Enables monitoring of busy tones; sends all messages. (Default.)
Zn
Soft reset
Z0
Soft reset
AT& Commands
&Cn
Data Carrier Detect (DCD) option
&C0
DCD remains ON at all times.
&C1
DCD follows the state of the carrier (default).
&Dn DTR (Data Terminal Ready) Option
&D0
Ignores DTR.
&D1
Enter the escape mode when ON-to-OFF transition is detected on
DTR.
&D2
Hangs up, assumes command state and disable auto-answer upon
detecting ON-to-OFF transition of DTR (default).
&D3
ON to OFF transition causes the modem to perform a soft reset. It
is the same as if an ATZ command is issued.
&Fn
Restore factory configuration (profile)
&Gn
Select guard tone
&G0
Disables guard tone (default).
&G1
Enables 550-Hz guard tone.
&G2
Enables 1800-Hz guard tone.
&Kn
Flow control
&K0
Disables flow control.
&K3
Enables RTS/CTS flow control (default for data modes).
&K4
Enables XON/XOFF flow control
&K5
Supports transparent XON/XOFF flow control.