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Alesis ADAT HD24 Remote Control Pin Out

Here are the measured resistance values for each button press on the remote control.

front panel of remote control

The remote control for the Alesis ADAT HD24 recorder uses combinations of 1/8 watt ±5% resistors to alter an input voltage.

I don’t have access to the recorder unit. Based on what I see inside the remote control I’m assuming it determines which button is pressed by measuring the voltage that is returned. Each button would lower the voltage by a different amount, thus making the measured value for each button press unique and identifiable.

The supply voltage that the recorder sends to the remote is unknown to me, but is likely one of the modern standard rail voltages — 3.3V, 5V, or 12V.

To obtain the following values I connected a digital multimeter across the tip and sleeve of the 1/4″ cable attached to the remote. All measurements are in Ohms.

Interestingly, the switch labels on the PCB differ slightly from the button labels on the case.

Also, I know this technically isn’t a pin out.

Switch Button Measured Value (Ω) PCB Label
N/A N/A 1406 (value read with no buttons pressed)
S1 Auto Loop 126 Auto Input
S2 Locate 0 279 Locate 1
S3 Loop Start 228 Locate 2
S4 Loop End 177 Auto 2>1
S5 Rehearse 76 All Input
S6 Set Locate 432 Set Locate
S7 Punch In 330 Locate 0
S8 Punch Out 381 Auto Play
S9 Rewind 1107 Rewind
S10 F Fwd 1207 F Fwd
S11 Stop 1008 Stop
S12 Play 899 Play
S13 Record 1307 Rec

component side of PCB

solder side of PCB

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