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These serial media converters convert RS232 and RS232/422/485 to USB. These converters let you easily build an industrial grade, long distance communication system with standard PC hardware.
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BBSmartworx ADAM-4561-CE ADAM-4561-CE

B+B SmartWorx Advantech ADAM 4500 Series Isolated USB to RS232/422/485 Converter w/(1) plug-in 3-wire RS232/422/485  terminal block, (1) USB type A [type A to type B cable provided] & 3000 VDC isolation (no external power supply necessary)

ESP Price: $157.00
BBSmartworx ADAM-4562-AE ADAM-4562-AE

B+B SmartWorx Advantech ADAM-4500 Series 1 port isolated USB to RS232 converter module

ESP Price: $112.00
Advantech USB-4604B-AE USB-4604B-AE

Advantech 4 port RS232 to USB converter w/surge

MSRP: $205.00
ESP Price: $186.55