quote:Originally posted by DaveJfr0:quote:Btw, I found out that the DIN driver will never exceed 25mA, but can work with as little as 1mA.
Hmm, I'm reading the words but not sure what your last sentence means. Anyone?
I don't fully understand it myself, but thats what Terry of Custom Signals said. That line off the SCB will never exceed 25mA, so that is the max I'd have to pull down to ground.
What this means is the SCB Din input has a pullup resistor. If you directly shorted (a hard ground such as relay contacts closing for instance) this line to ground, you would be current limited to 25mA and the Din logic device pin would see this as a logic low. If you applied a resistor between the input and ground of a value such that only 1mA current could flow, the Din logic device pin would also read this as a logic low and respond accordingly. So basically having a FET, NPN transistor or relay pull Din down to ground would make the SCB board do whatever it was programmed to do.
