Features: 1.1 TO 8 RS485 SPLITTER HUB: Industrial isolated 1 to 8 RS485 hubs with industrial grade super anti interference chips, surge protection, and static protection circuits. 2.BIDIRECTIONAL COMMUNICATE: RS232 RS485 RS422 fiber converter two way communicate, plug and play, no driver required, good heat dissipation, stable performance. 3.SUPPORT 128 DEVICES: Support up to 128 devices per channel, support 152.2Kbps high baud rate. 4.INDUSTRIAL GRADE: Using industrial grade components and metal housing, it can work in a wide temperature range of ?40C to 75C (?40F to 167F). You can use it in harsh outdoor environments. 5.WIDELY USED: Serial device server is widely used in industrial system, communicate, transportation, education, finance, power, security, charging system, etc. specification:Item Type: RS232 RS485 RS422 Optic Modem Material: Iron Voltage: 100-240V Interface: RS232 RS485 RS422 Communicate Distance: Approx. 1200m / 1312.3yd Communicate Rate: 300-115200bps Number of Supported Nodes: 32 Carrying Capacity: Up to 128 Devices per Channel Transmission Medium: Parallel Line/Twisted Pair Isolation Mode: Input and Output Optoelectronic Isolation Power Supply Voltage: DC9-48V PackageList:1 x RS232RS485RS422Hub 1 x Adapter 1 x 2 Position Terminal Block 2 x 8 Position Terminal Block 1 x User Manual