Comtrol RM-4 - Manual (Page 9)

Hardware Installation and Specifications RocketModem IV: 2000468 Rev. A - 9
AT% Commands
&Pn Select pulse dial make/break ratio
&P0 39/61 make/break ratio at 10 pulses per second (default)
&P1 33/67 make/break ratio at 10 pulses per second
&P2 39/61 make/break ratio at 20 pulses per second
&P3 33/67 make/break ratio at 20 pulses per second
&Qn Select Operation Mode
&Q0 Selects direct asynchronous operation
&Q5 The modem will try an error corrected link (default)
&Q6 Selects asynchronous operation in normal mode (allows speed
buffering and flow control but no error correction).
&Sn DSR override
&S0 DSR remains ON at all times (default).
&S1 DSR becomes active after answer tone has been detected and
inactive after carrier has been lost.
&Wn Save current configuration – Will save DTE speed, parity settings, AT
commands, and S Registers.
&W0 Save the current configuration to stored profile 0
&W1 Save the current configuration to stored profile 1
&V Display modems current configuration. When this command is entered,
the modem will display its current command and register settings.
AT% Commands %Cn Enables or disables data compression
%C0 Disables data compression
%C1 Enables MNP 5 data compression negotiation.
%C2 Enables V.42 bis data compression (Sets S46 bit 1)
%C3 Enables V.42 bis and MNP 5 data compression (default.)
%En Line quality monitor
%E0 Disable line quality monitor and auto-retrain
%E1 Enable line quality monitor and auto-retrain
%E2 Enable line quality monitor and fallback/fall-forward (default)
%L Line signal level
Returns a value that indicates the received signal level. For example,
009 = –9 dBm, 043 = –43 dBm, and so on.
%Q Line signal quality
Reports line signal quality (DAA-dependent). Returns higher order byte of
the EQM value. Based on EQM value, retrain or fallback/fall-forward may
be initiated if enabled by %E1 or %E2.