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Chapter 4—AT Commands, S-Registers, Result Codes
Command: Sr=n Set Register Value
Values: r = S-register number; n varies
Default: None
Description: Set value of register Sr to value of n, where n is entered
in decimal format. E.g., S0=1.
Command: Sr? Read Register Value
Values: r = S-register number
Default: None
Description: Read value of register Sr and display it in 3-digit
decimal form. E.g., S2? gives the response 043.
Command: T Tone Dialing
Values: P, T
Default: T
Description: Configures the modem for DTMF (touch-tone) dialing.
Dialed digits are tone dialed until a P command or dial
modifier is received.
Command: Vn Result Code Format
Values: n = 0 or 1
Default: 1
Description: V0 Displays result codes as digits (terse response).
V1 Displays result codes as words (verbose response).
Command: Wn Result Code Options
Values: n = 0, 1, or 2
Default: 2
Description: W0 CONNECT result code reports serial port speed,
disables protocol result codes.
W1 CONNECT result code reports serial port speed, en-
ables protocol result codes.
W2 CONNECT result code reports line speed, enables pro-
tocol result codes.