4-20ma to RS485 Converter, A/D Converter with Modbus

  • May 22, 2014
  • Shenzhen WAYJUN Industrial Automation
4-20ma to RS485 Converter, A/D Converter with Modbus
4-20ma to RS485 Converter, A/D Converter with Modbus


  • Analog signal acquisition,isolated RS-485/232 output
  • 12-bit AD converter, testing accuracy >0.1%
  • Can be remotely reconfigured for modules accuracy 
  • Three-port isolation(input/output/assistant power supply): 3000VDC 
  • Power supply:8~32VDC
  • High reliability,easy programme,installation. 
  • Can programme setting module address,baud rate
  • 0-5V voltage signal or 4-20mA current signal input
  • Support Modbus RTU
  • DIN35 Rail-mounted ‚óè Dimension:106.7x79.0x25.0mm



  • Signal testing/monitoring/cintrol
  • S-232/485 industrial automation control system
  • Industial field signal isolation
  • Process Monitoring & Control
  • Test sensors signal
  • Laboratory Data Acquisition
  • Medical machine monitoring
  • 20mA/0-5V signal acquisition

Products List Samples:

  • WJ21-A4-485 (4-20ma input signal, output is rs485 interface)
  • WJ21-A3-232 (0-20ma input signal,output is RS232 interface)
  • WJ21-A7-485(0-±20mA input,output is rs485 interface)
  • Other types,please check our datasheet.


Product Overview:                                            
WJ21 series products realize the signal acquisition between sensor and host, to measure analog signals. WJ21 products can be applied to RS-232/485 bus industrial automation control system,4-20mA / 0-5V signal measurement, monitoring and control,0-75mV ,0-100mV and other small-signal measurement and signal isolation and long-term industrial  transmission and so on.

Products include power supply isolation, signal isolation, linearization, A/D conversion and RS-485 serial communication. Each serial interface can connect up to 255 pieces WJ21 Series modules, communication using ASCII code or MODBUS RTU communication protocol, and its instruction set compatible with the ADAM modules, baud rate can been set by the code, with other manufacturers control module hang in the same RS-485 bus for easy programming.

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