Sinking / Sourcing Digital I/O
On an ACR controller (except ACR1500), both digital inputs and outputs may be changed from sinking to sourcing and visa-versa by changing the appropriate jumpers on the card.
HOWEVER, if you change output mode, you must ALSO change the appropriate output IC chips on the board to be compatible. Damage to the card can result from using the incorrect output ICs.
If you are using an Acrloop RBB or RBD breakout box you cannot change the outputs from sinking to sourcing. The breakout box must ordered for either sinking or sourcing outputs and is not user-selectable. Damage to the card could result if connected incorrectly.