Everything you need to know is in the
Vectric Post Processor Guide ...
This is a
good read and does what you are looking to do (turning a switch on/off). The post processor for that is
here - Just download it and see how it was done for yourself.
FYI - All it's doing is turning an Output On (1) or Off (0) :: SO,5,1 means
Set
Output number
5 to
1/ON This means that you need to have your physical #5 Output on the control board wired to your relay board and your valve on the other side of the relay. You'll also need a common ground between the boards...
-B