- The ComNet FDX60 (M,S) [-M] data transceivers provide point-to-point transmission of simplex or duplex EIA RS232/RS422/RS485 (2W/4W) data signals over one or two optical fibers. Models within this series are. Comnet FDX60M1B Bi-directional RS Data Transceiver Overview The FDX60M1B is an industrial-grade fiber optic transceiver that converts RS232, RS422, an. Adding to cart. The item has been added Manufacturer-verified compatible cameras, recorders, mounts, accessories, and licenses for this product. This module solves the core problem of long-distance, noise-immune data transmission in surveillance and access control installations where copper serial.