PH-S series product is an industrial S908 RIO data optical transceiver, which supports 1. 544Mbps protocol with standard F head with coaxial interface compatible with S908 data connector. Single optical port / dual optical port chain network support, 35mm DIN rail, DC 9-30V power supply ， Suppoyt S908 RIO bus protocol. PH-S221 supports one optical fiber interface, one data interface, PH-S222 supports two cascadable uplink and downlink optical fiber interfaces, and one data interface.