PH-C series product is an industrial CAN data optical transceiver, which supports CAN2.0A/B protocol, communication rate 500K with single optical port/dual optical port chain network. Protection level is IP30, with wavy aluminum reinforced enclosure mounted on 35mm DIN rail, DC (9-30) V power supply with relay alarm output, redundant power supply and isolation protection function. PH-C2221 supports one optical fiber interface, one data interface, PH-C2222 supports two cascadable uplink and downlink optical fiber interfaces, and one data interface.