These compact, isolated USB to RS-232 and USB to RS-422, and RS-485 converters allow you to add an asynchronous serial port to your USB only PC. The built in 2 kV isolation protects your port from dangerous ground loops. They are perfect for connecting to remote devices or programming ports in field service applications. They are USB 2. 0 compatible. Model USO9ML2 is the RS-232 version and supports hand shake signals as well as data at speeds up to 460. 8 Kbps. Model USOPTL4 is the RS-422 and RS-485 version and supports data rates up to 460. 8 Kbps. RS-485 2-Wire and 4-Wire modes are selected using a DIP Switch. If you don't need isolation, use model USPTL4. Windows operating systems up to Windows 7 (32 and 64 bit) are supported. The USOPTL4 is equipped with our signature high retention USB port. The RS-422/485 versions have a removable terminal block. Need a strain relief for your RS-422 or RS-485 cable? Check out the accessories tab for our TB5P508SR-2PK. Manufacturer: B+B SmartWorx. Manufacturer Part Number: USPTL4-LS. Brand Name: B+B. Product Model: USPTL4-LS. Product Name: USB/Serial Data Transfer Adapter. Product Type: Data Transfer Adapter. [Technical Information] Adapter Type: Serial/USB. Connector on First End: 1 x Terminal Block RS-422/485 Serial. Connector on Second End: 1 x Type B Female USB 2. 0 USB. Features: Surge Protection. LED Indicator. [Miscellaneous] Package Contents: USB/Serial Data Transfer Adapter1 Meter USB CableDriver CD. Certifications & Standards: CEEN 55022EN 61000-6-1EN 61000 (-4-2, -4-3, -4-4, -4-5, -4-6, -4-8, -4-11)CC Class BCISPR Class B (EN55022). [ ] Limited : Lifetime.