XTENDR, RS232 (serial) to RS485/RS422 Converter 2/4 wire, DB9 Female, RS485 Terminal block or RJ11, Full/Half duplex, 16KV ESD isolation, up to 115,200 baud,
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Baud rate converter, active photoelectric isolation converter, RS232 to RS485/422 band, status indicator - Newegg.com
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Interface Converter, Converter 3.5mm Male Audio Cable 9600 Standard Baud Rate with Indicator Light for Radio : Amazon.ca: Electronics
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Converter Lightweight 9600 Standard Baud Rate 3.5mm Cable Interface Converter ABS Multi-Purpose With Radio Indicator Light : Amazon.co.uk: Computers & Accessories
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TSH-724 Serial Port Sharing Device, Baud Rate Converter and Modbus RTU converter with PoE and 2 RS-485 Ports and 3 RS-232 Ports - Walmart.com
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RS232/RS485 Baud Rate Converter 1 to 4 Channels of 485 or 232 Data Transparent Transmission, Baud Rate Over 3M - AliExpress
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Tengcon Ec7520 Serial Converter with Baud Rate 187kbps - China Serial Converter, 4-20mA Converter | Made-in-China.com
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