Appendix a – EXP Computer ThinFax LXM User Manual
Page 24
APPENDIX A
Basic Data Modem 'AT' Commands
Command
Default
Function
A/
**
none
Repeat last command
A
none
Answer
Bn
*
1
Select CCITT or Bell
Cn
1
Carrier control option
D
none
Dial command
En
*
1
Command echo
Fn
1
On-line echo
Hn
0
Switch hook control
In
0
Identification/checksum
Kn
none
SRAM buffer control
Ln
*
2
Speaker volume control
Mn
*
1
Speaker control
Nn
*
1
Connection data rate control
On
0
Go on line
P
*
none
Select pulse dialing
Qn
*
0
Result code display control
Sn
none
Select an S-register
Sn=x
none
Write to an S-register
Sn?
none
Read from an S-register
?
none
Read last accessed S-register
T
*
none
Select DTMF dialing
Vn
*
1
Result code form
Xn
*
4
Result code type
Yn
*
0
Long space disconnect
Zn
0
Recall stored profile
&Cn *
1
DCD option
&Dn *
2
DTR option
&F
none
Load factory defaults
&Gn *
0
Guard tone option
&Jn *
0
Auxiliary relay control
&M0 *
0
Communication mode option
&Pn *
0
Dial pulse ratio
&Q0 *
0
Communication mode option
&Sn
*
0
DSR option
&Tn
0
Self test commands
&Vn
0
View active and stored configuration
&Un *
0
Disable Trellis coding
&Wn
0
Stored active profile
&Yn *
0
Select stored profile on power up
&Zn=x
none
Store telephone number
%En *
1
Auto-retrain control
%G0 *
0
Rate Renegotiation
%Q
none
Line signal quality
-Cn
*
0
Generate data modem calling tone
* Value saved in NVRAM.
** Command not preceded by an 'AT'.
_
Patent pending.
Data Mode Error Detection and Data Compression
The EXP ThinFax LX/LXM supports two types of error correction (MNP 2-4 and
V.42) and data compression (MNP 5 and V.42 bis). V.42 error correction uses LAPM
as the primary error- control protocol, and uses MNP 2-4 as an alternative. V.42 bis
data compression requires V.42 (LAPM only). MNP 5 requires MNP 2-4. The
supported V.42/MNP 'AT' command set is listed below
V.42, MNP 'AT' Commands
Command Default
Function
%An*
13
Set auto-reliable fallback character
%Cn*
1
MNP 5 data compression control
\An*
3
MNP block size
\Bn*
none
Transmit break
\Cn*
0
Set auto-reliable buffer
\Gn*
0
Set modem port flow control
\Jn*
0
Bps rate adjust control
\Kn*
5
Set break control
\Nn*
3
Set operating mode
\O*
none
Originate reliable link
\Q*
3
Set serial port flow control
\T*
0
Set inactivity timer
\U*
none
Accept reliable link
\V*
2
Modify result code form
\Xn*
0
Set XON/XOFF pass-through
\Y
none
Switch to reliable mode
\Z
none
Switch to normal mode
-Jn*
1
Set V.42 detect phase
"Hn*
3
V.42 bis compression control