IBM 2193 - Manual (Page 187)

Modem information B-7
Table1: AT commands (Continued)
Command Function
I2 ROM test
I3 Firmware and device ID
L0 Low speaker volume
L1 Low speaker volume
L2 Medium speaker volume
L3 High speaker volume
M0 Speaker always off
M1 Speaker on until carrier detected
M2 Speaker always on
O0 Return to data mode
O1 Initiate an equalizer retrain and return to data mode
P Pulse dial
Q0 Result codes enabled
Q1 Result codes disabled
Sr? Read S register r, where r=0-95
Sr=n Set S register r to value n (r=0-95; n=0-255)
T Tone dial
V0 Numeric responses
V1 Text responses
X0 Hayes Smartmodem 300 compatible responses/blind dialing