US Robotics Sportster Flash x2 User Manual page 52

Qn Displays/suppresses result codes.
* Q0 Displays result codes
Q1 Quiet mode; no result codes
Q2 Displays result codes only in Originate
mode
Q3 Displays result codes only in Ring mode.
Sr.b=n Sets bit .b of register r to n (0/OFF or 1/ON).
Sr=n Sets register r to n.
Sn? Displays contents of S-Register n.
S$ Displays a list of the S-Registers.
T Sets tone dial.
Vn Displays verbal/numeric result codes.
V0 Numeric codes
* V1 Verbal codes
48 Sportster Flash x2 - User's Guide