RJ11 cable for controlling Draper Control Box via RS-232 or Dry Contact.RS-232The Control Box can be controlled by RS232 signals. It is a mute system so it can receive the commands but not send confirmations back. The RS232 uses the RJ11 socket, pins 1 & 6, Dry ContactThe Controll Box can be controlled with dry contact through the RJ11 socket. Make a connection between NEUTRAL pin 5 and one of pins 2 – 4 depending on desired action.Ex. Connection between pins 2 & 5 will run screen down.