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uart - The 20mA loop to USB fails midway of connection with unknown reason! - Electrical Engineering Stack Exchange
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BB-232CL9R - ULI-227TL - RS-232 (DB9 Female) to 20 mA Current Loop (Terminal Block) Converter - Advantech
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Rs232/tty (20ma Current Loop) Converter Full Duplex Maximum Rate 9600bps No Power Supply - Industrial Computer & Accessories - AliExpress
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