I-87055 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-87055 is an Isolated Digital Input & Output Module with 16 channels; 8 input and 8 output. It's input type is Isolated digital input. I-87055 is a serial cartridge based I/O module that offers the ultimate in cost effective flexibility.