Remove the shunt between GND and PHO on the electronic board. Connect the +24V of the photocells to the +24V of the board. Connect photocell GND to board GND. Connect the NC of photocell RX to PHO on the board. Place a shunt between GND and COM of the receiving photocell.
Remove the shunt between GND and PHO on the electronic board. Connect the + of the photocells to the +24V of the board. Connect the – of the photocells to the board’s GND. Connect the NC of photocell RX to PHO on the board. Place a shunt between – and COM of the receiving photocell.