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2 Channels Isolation 0-20mA/4-20mA to RS485 or RS232 Converter (support Modbus RTU) Data Collector Acquisition (2-16channels is available)
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0-5V to RS232 Converter, 8-CH 0-5V Analog Input to RS485 Converter (SYAD 08)
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4-20mA to Serial Converter, 4-20mA to Modbus Converter, 4-20mA to RS232 Converter with 8-CH Analog Input
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USB to RS232 Converter with IC Chipset PL or FTDINew
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RS485 to RS232 converter
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USB 1.1 or 2.0 to RS232 Converter
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USB to RS232 Serial Cable DB9 RS232 Converter
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USB 1.1 or 2.0 to RS232 Converter, Power Management, Supports Full and High Speed
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Dual-color USB2.0 to RS232 Converter Cable with Supports Automatic Handshake Mode