AT&T DataPort PCX Modem User Manual page 60

AT Commands and S-Registers
Table B-1. AT Command and S-Register List (21 of 21)
AT Command/
S-Register
%L
%Q
+FCLASS?
+FCLASS= n
+H n
Description
LINE SIGNAL LEVEL
Returns a value indicating the received line signal in
dBm.
NOTE: This value is not sensed at the telephone line
connector.
LINE SIGNAL QUALITY
Returns a value indicating the line signal quality. This
is the value checked for the %E1 or %E2 options.
FAX/DATA MODE QUERY
Displays the fax or data mode expressed as a
number 0 (for data mode), or 1 (for Fax Class 1).
FAX/DATA MODE SET
Determines whether the modem operates in fax or
data mode.
n can be one of two values:
0 = Data
1 = Fax Class 1 (EIA/TIA 578)
RPI TOGGLE
Determines whether Rockwell Protocol Interface
(RPI) processing is used. RPI uses WinRPI, running
on your PC, for error correction and data compression
services. The initialization string must include +H11
for WinRPI to function.
+H, +H0 Disable RPI.
+H11 Enable RPI.
Issue 2 July 1995
B-21