inout Panelplayer User Manual page 34

Position P1 and P2 jumpers: IN5 and IN6
inputs with logical operation. (Default)
Panelplayer User Manual v.1.4
Position P1 and P2 jumpers: IN5 and IN 6
inputs enabled to the operation as RS485
serial port. To move the bridges, raise the
cover of the device and move the jumpers
of the board as indicated in the figure.
Page 33