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Chapter 2 - AT Commands, S-Registers, and Result Codes
MT3334SMI 23
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, enables protocol result codes.
W2 CONNECT result code reports line speed, enables protocol result codes.
Command: Xn Result Code Selection
Values: n = 0–7
Default: 4
Description: X0 Basic result codes (e.g., CONNECT); does not look for dial tone or busy signal.
X1 Extended result codes (e.g., CONNECT 46000 V42bis); does not look for dial tone or busy signal.
X2 Extended result codes with NO DIALTONE; does not look for busy signal.
X3 Extended result codes with BUSY; does not look for dial tone.
X4 Extended result codes with NO DIALTONE and BUSY.
X5 Extended result codes with NO DIALTONE and BUSY.
X6 Extended result codes with NO DIALTONE and BUSY.
X7 Basic result codes with NO DIALTONE and BUSY.
Command: Zn Modem Reset
Values: n = 0 or 1
Default: None
Description: Z0 Reset modem to profile saved by the last &W command.
Z1 Same as Z0.
Command: &Cn Data Carrier Detect (DCD) Control
Values: n = 0 or 1
Default: 1
Description: &C0 Forces the DCD circuit to be always high.
&C1 DCD goes high when the remote modem’s carrier signal is detected, and goes low when the
carrier signal is not detected.
Command: &Dn Data Terminal Ready (DTR) Control
Values: n = 0, 1, 2, or 3
Default: 2
Description: &D0 Modem ignores the true status of the DTR signal and responds as if it is always on.
&D1 If DTR drops while in online data mode, the modem enters command mode, issues an OK, and
remains connected.
&D2 If DTR drops while in online data mode, the modem hangs up. If the signal is not present, the
modem will not answer or dial.
&D3 If DTR drops, the modem hangs up and resets as if an ATZ command were issued.