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SH-U11L is an upgraded version of SH-U11. SH-U11L has a 5FT/1.5M extension cable, which brings you more flexibility.This USB to RS422/RS485 adapter is powered by the USB port, so no external power supply is required. The RS422 / RS485 end is a 5PIN screw terminal board for easy connection of cables or single wires. Please note: There is no 120 ohm resistor between A+ and B-. Specification: Model NO: SH-U11L Standard : RS485/RS422 Main chip: FTDI FT232RL Interface: USB Type A ,5 PIN Terminal Block RS485 PIN: TXD+(A+), TXD-(B-) RS422 PIN: RxD+, RxD-, TxD+, TxD-, GND Cable Lenght: 5 Feet/1.5M USB 2.0; compatible USB 1.1 Baud rate: 300bps to 3Mbps Compatibility: Windows 10,8,7,Linux,Mac OS APPLICATION LED display communication data; machine PLC data read, write, and PTZ control; Centralized control of household electrical appliances; access control systems; variety of industrial automation; instrumentation; employee attendance machine; highway toll station; ATM machine. Packing list: 1 X SH-U11L USB to RS485 Cable 1 X User manual 1 X CD Driver WARRANTY: DSD TECH offers a 12-month warranty on this USB to RS485/RS422 Cable. If you have any questions, please contact us and we will resolve your issue within 24 hours.