RUGGEDCOM RMC20 media converter is a utility-grade, protocol-independent, serial-to-fiber and serial standards converter for all serial communication requirements. The RMC20 allows RS485, RS422, or RS232 devices or networks to communicate over secure, noise immune, optically isolated, fiber optic cabling at extended distances as well as convert RS232 to either RS485 or RS422 serial standards HI = 88-300 VDC or 85-264 VAC XX = No Power Supply 2 XX = none XX = none XX = Manufacturing modification: none