The PH-M series product is an industrial Modbus data optical transceiver, supports Modbus protocol, communication rate is 0-230. 4K, single optical port / dual optical
port chain network with IP30 protection grade, 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-M221 supports one optical fiber interface, one data interface, PH-M222 supports two cascadable uplink and downlink optical fiber interfaces, and one data interface.