13.2.2 ACR/RIM Board Jumper Setup
Setup jumpers to match pump type being connected. When a
jumper is set as ON, this means the jumper will tie both pins
together. When OFF, the jumper should be set on one pin.
Some jumpers have three pins, when the jumper says pins 1-2
this means the jumper should be set on pins 1 and 2 of the
three-pin jumper. On three-pin jumpers, the board is labeled
which pin is number one (see Figure 13-7).