Features: Supports RS232, RS422, and 2- or 4-wire RS485 One bi-directional contact closure Robust design ensures extremely high reliability in unconditioned out-of-plant environments Status indicating LEDs provide rapid indication of critical operating parameters. Five year warranty Voltage transient protection on all power and signal input/output lines provides protection from power surges and other voltage transient events. Compatible with NTSC, PAL, or SECAM Video Standards 10-bit digitally encoded short-haul video transmission meets the requirements of the EIA RS-250C standard. Standard ComFit models are hot-swappable. ComFit standard form factor is designed for wall, surface, rack, or DIN rail mount installations (using optional card cage or DIN mounting bracket).