USB to RS485 Converter With TVS Transient Suppression Protection Signal Indicator for Windows Item Type: USB to RS485 Converter Support Baud Rate Range: 75bps-115200bps Signal Reception Indicator: RX, LED Signal Transmission Indicator: TX, LED Driver: Use CH340 driver, compatible with CH340 driver A: RS485 signal positive B: RS485 signal negative GND: Common ground +5V: Positive 5V power output Compatible Operating Systems: For Windows 98SE For Windows ME For Windows 2000 SP4 For Windows XP SP2 and above(32 and 64 bit) For Windows Server 2003 (32 and 64 bit) For Windows Server 2008/2008 R2 (32 and 64 bit) For Windows Vista (32 and 64 bit) For Windows 7 (32 and 64 bit) For Windows 8/8.1(32 and 64bit)