The UK edition

StarTech.com 2 Port USB to RS232 RS422 RS485 Serial Adapter with COM Retention - TAA

£94.99

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Backwards compatible with USB 1.1. Both ports can function simultaneously with mixed or matched communication protocols. USB-powered; No additional external power adapter required. Includes a bracket for wall mounting the USB to Serial adapter. Features rugged screw-lock USB port to ensure cords are not accidentally disconnected. Ability to rename devices for easy recognition. COM Port assignments maintained after reboot. Port 1 (DB9) configurable for RS232, RS422, or RS485; Port 2 (Terminal Block) configurable for RS422 or RS485. Multiple interface modes, including: 4 wire RS422(TxD+/-, RxD+/-), and 2 wire RS485 (DATA+, DATA-). Supports RS-485 Auto Transceiver Turn Around by Unique Featured