Usage Tips:Item Type: Fiber Optic Converter Material: ABS Model: YN4542-A+YN4542-B (used in pairs) Interface: Compatible with EIA/TIA RS-485 standard Optical Interface: RS-485 pluggable terminal block, twisted pair Optical Fiber: pluggable SC interface, single mode single fiber Power Supply: 5.5mm inner positive and outer negative, standard power socket Interface Protection: RS-485 600W surge protection, 250V withstand voltage protection Nodes Number: RS485 maximum 32 Terminal Resistance: RS485 external connection as required Baud Rate: 1.2k, 2.4k, 4.8k, 9.6k, 19.2k, 38.4k, 57.6k, 115.2k self-identification Data Bits: 8, N, 1 Optical Fiber Parameters: A End T1310R1550 B End T1550R1310 Transmission Distance: Optical fiber approx. 20km / 65617ft RS485 approx. 1200m / 3937ft at 19.2kbps Power Consumption: 1W DC5V Status Indication: Real-time display of on-board transceiver indicator Working Temperature: -20~65 Working Humidity: 25%~85% (non-condensing)