Sensors and servo valves are wired directly to two I/O terminal blocks mounted on
the terminal board. Each block is held down with two screws and has 24 terminals
accepting up to #12 AWG shield termination strip attached to chassis ground is
located immediately to the left of each terminal block. External trip wiring is
plugged into either JD1 or JD2. The screw connection and position choices for the
servo current jumpers.