Yaesu FT-712RH Operating Manual page 35

(1) Press VOICE (if displaying frequency) to activate the DVS-1.
(2) Note the indicated Bit Rate, and change it, if desired, by pressing the REV
button, turning the tuning knob to select the desired Bit Rate, and pressing
REV again.
(3) Press the RPT button (the display will show simply "R" followed by the Bit
Rate number (1 - 4).
The transceiver is now set for remote control. The Command Chart on the next
page shows the various commands and their results. To send a command, hold
the PTT switch on the remote transceiver while entering the indicated DTMF
Code keys, one at a time. Then, if you are recording, speak into the microphone.
Otherwise, release the PTT switch and listen for the response from the DVS-I.
Note that Segment 1 (which should be your callsign) is read back before any
other data is transmitted.
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