The 8730 external switch interface allows the use of mechanical foot switches or other normally open switches to control a S-link bow thruster. In addition it allows for connecting the 8980/8985 radio remote control. The 8730 sends proportional thrust on the S-link bus. This is 70% as default, this value can be changed on an PJC212, PJC211, PJC222 or PJC221 panel.