Interface that allows the local connection between the PC (serial port) and the installation, thus being able to configure, control and manage the installations. Used for management and maintenance of facilities that have the PC permanently connected. DIN-6 rail format for easy installation inside an electrical equipment box, or they can be screwed directly onto the wall. PC connection: Serial port (RS-232), max 30 meters (including 3 meter cable). Installation connection: RS-485 (twisted pair), max 1000 meters.