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Chapter 3 - AT Commands, S-Registers, and Result Codes
MT5634ZLX/FE
X7 Display CONNECT or “1” for all speeds. Check dial tone and busy tone.
Zn Recall stored profile.
Z0 Reset and recall user profile 0. Either Z0 or Z1 restores the same single profile.
Extended “AT&” (Ampersand) Command Set (* indicates factory default setting)
Command Function
&Cn Data carrier detect option
&C0 State of carrier from remote modem is ignored. DCD circuit is always on.
&C1 * DCD turns on when the remote modem’s carrier signal is detected, and off when the
carrier signal is not detected.
&Dn Data Terminal Ready (DTR) option
&D0 DTR ignored
&D1 Go to command mode on on-to-off DTR transition.
&D2 * Hang up and go to command mode on on-to-off DTR transition. Auto-answer is
disabled if DTR is low.
&D3 Hang up and reset from user profile 0 on the on-to-off DTR transition.
&F Recall factory default setting as active configuration.
&Gn V.22bis guard tone option
&G0 * No guard tone
&G1 550 Hz guard tone
&G2 1800 Hz guard tone
&Kn Set local flow control
&K0 Disable flow control
&K3 * Enable bi-directional hardware flow control (CTS/RTS).
&K4 Enable bi-directional software flow control (XON/XOFF).
&Pn Pulse dialing make/break ratio selection
&P0 Make=39%, Break=61%, international version (Default)
Make=33%, Break=67% for use in 20 pps, Japanese version
&P1 Make=33%, Break=67%, international version
Make=33%, Break=67% for use in 10 pps, Japanese version (Default)
&Qn Async communications mode options
&Q0 Async mode, buffered (same as “AT\N0”)
&Q5 * Error control mode, buffered (same as “AT\N3”)
&Q8 MNP error control mode. If an MNP error control protocol is not established, the
modem will fallback according to the current setting in S36 register.
&Q9 V.42 or MNP error control mode. If neither error control protocol is established, the
modem will fallback according to the current setting in S36 register.
&Sn Data Set Ready (DSR) option