I-87057 has a serial bus (RS-485) communication interface with DCON protocol. It can be plugged into our WinCon, LinCon, I-8000 controllers and I-87K, RF-87K I/O expansion units. I-87057 is an Isolated Digital O.C. output Module with 16 channels. I-87057 is a serial cartridge based I/O module that offers the ultimate in cost effective flexibility.