Testing Sierra Wireless AirLink GX440 modem Digital Output / Relay.
Wiring configuration:
Black ---------- Common/Gnd/+0vdc
Red ------------ +10-28vdc
White --------- +10-28vdc
Green --------- Relay CL- (this is Di/Pulse/DO pin)
+10-28vdc -- Relay CL+
There is still some trickle voltage (between 1.7 - 4.5vdc depending on 12 or 24vdc supply) when the contact is opened, but that's probably because this is a multi-use connection (DI, Pulse counter, DO). It's not enough to actuate the 24vdc Relay, but does dimly light LED. The drawing shows a diode. I'll see if that removes the voltage when open.
