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StarTech ICUSB234858I USB to RS-232/422/485 Serial Adapter - 8 Port - Industrial - 15 kV ESD Protection - USB to Serial Adapter - USB to Serial Hub - Newegg.com
Tripp Lite USB to Serial Adapter Converter RS-422/RS-485 USB to DB9 1-Port - U208-001-IND - USB Cables & Adapters - CDW.com
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