StarTech.com USB to RS232/RS485/RS422 Industrial 4 Port Serial Hub Adapter - USB to Serial Converter - ICUSB234854I - USB Adapters - CDW.com
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Amazon.com: DTech Active Isolated RS232 to RS485 RS422 Converter with RJ45 Serial Port Terminal Board Power Adapter DB9 Cable Optical Isolation Protection 2.5kV : Electronics
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Industrial grade isolated RS232 TO RS485 converter, magnetical isolation, 600W lightning-proof & anti-surge
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Amazon.com: JUXINICE 2Packs DB9 Serial Adapters No Soldering Needed. D-SUB 9-pin RS232 RS485 Adapter to Terminal Connector Signal Module with Bolts Nuts and Screwdriver (1PCS Male+1PCS Female) : Electronics
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RS232 To RS485 Converter (B), Active Digital Isolator, Rail-Mount support, 600W Lightningproof & Anti-Surge, Multi-isolation protection
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