Energy Meter & Power MeterChina ISO 4021 U (A) -232/485 Series 0-20mA/4-20mA/0-5V/0-10V/1-5V Analog Signal to RS232/RS485 Modbus RTU Data Acquisition Module, Find details about China Ai Data Acquisition Module, Analog to Modbus Converter from ISO 4021 U (A) -232/485 Series 0-20mA/4-20mA/0-5V/0-10V/1-5V Analog Signal to RS232/RS485 Modbus RTU Data Acquisition Module