10-16-2020, 12:30 PM
(10-16-2020, 11:27 AM)Rayzzfish Wrote: I've been having trouble with wiring the 8 relay module to the db9. Any help would be great. I will attach a couple photos to show what I'm working with. Thanks...
Is that plugging into the controller, as in is it male?
The only pin that really matters is Ground and VCC. The signal pins can be sorted out in reef-pi.
On the right side of image you can see the pin out. There's so many different standards I don't really trust pin numbers anymore so use your continuity meter and touch what I have marked as Ground pin and see which screw terminal it goes to, then add the ground wire to that screw terminal.
I'm guessing the screw terminal marked "GND" goes to the outer casing of DB9, verify if it does. If so you can use that for +5v or +12v to power up the relay module. However on the controller board behind power bar 1 DB9 you'll need to solder a pad to send +5v or +12v.
