Item Type: Fiber Optic Converter Material: ABS Model: YN4542-A and 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 Approximately 20km / 65617ft, RS485 Approximately 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)