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Amazon.com: DTECH RS232 to RS485 / RS422 Serial Communication Data Converter Adapter Mini-Size : Electronics
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Amazon.com: DTECH RS232 to RS485 Converter Serial Adapter with 4 Position Terminal Block for Long Haul Data Communication Supports 600W Anti-Surge : Electronics
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Rs232 To Rs485 Converter Rs232 Rs485 Converter Rs-232 To Rs-485 Adapter For Security System Closed-circuit Monitoring - Add On Cards & Controller Panels - AliExpress
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