with RS485 Connector Modbus Generator Controller DC70dr - China Controller with Modbus, Generator Control Module | Made-in-China.com
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Eletechsup DC 12V RS485 to 4-20MA 0-20MA Current Signal Generator DAC Converter Module Modbus RTU for PLC Measuring Instruments (1 Channle RS485 to 4-20MA, 1): Amazon.com: Industrial & Scientific