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I want to use the GPIO on my SD9 or SD11

There are 2 GPI’s and 2 GPO’s. These are on 4 x 1/4″ jack sockets, which are stereo TRS sockets (tip, ring, sleeve) wired to tip and sleeve only, compatible with mono plugs.

GPI’s are CMOS logic inputs, pulled high by a 5 KOhm resistor to 5V. A simple contact closure to chassis will activate these.

GPO’s are floating reed relay contacts. Rated 1A 24V AC/DC

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