Signal Isolated Converter, Signal Conditioners, Frequency Converters manufacturer / supplier in China, offering Motor Speed Measurement Converted to Standard Modbus RTU Protocol PWM Signal Pulse Frequency, 4-20mA to RS232 Modbus Data Acquisition Module Signal Isolation and Acquisition Module Input Current / Voltage Input, Two Channels Analog Signal to RS485/232 Converter Modbus Data Acquisition Module for Industrial Automation and so on.