4-20ma to RS485 Converter 4-20ma to RS485 Converter
4-20ma to RS485 Converter
4-20ma to RS485 Converter

4-20ma to RS485 Converter

Product Details:


Product Description

Analog Current signal to RS485 or RS232 Converter/Analog data acquisition module.Slim-line plastic housing with integral 35mm DIN rail mounting , power supply(8-32VDC)

Products selection guide

WJ21 U(A)

Input signal(current/voltage) Communication Interface

U1:0-5V A1:0-1mA 485:RS-485 output interface

U2:0-10V A2:0-10mA 232:RS-232 output interface

U3:0-75mV A3:0-20mA

U4:0-2.5V A4:4-20mA

U5:0- ±5V A5:0-‚ ±1mA

U6:0-‚ ±10V A6:0-‚ ±10mA

U7:0-ƒ‚ ±100mV A7:0- ±20mA

U8:user-defined A8:user-defined

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)

  • WJ21-A4-232 (4-20ma input signal, output is rs232 interface)

Other types,please check our datasheet.


  • 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/0-10V/0-12V voltage signal or 4-20mA/0-20mA current signal input

  • Support Modbus RTU

  • DIN35 Rail-mounted

  • Dimension:106.7x79.0x25.0mm


  • Signal testing/monitoring/cintrol

  • RS-232/485 industrial automation control system

  • Industial field signal isolation

  • Process Monitoring & Control

  • Test sensors signal

  • Laboratory Data Acquisition

  • Medical machine monitoring

  • 4-20mA/0-5V signal acquisition

General parameters: (typical @ +25 deg.C, Vs to 24VDC)

  • Input type: Input current / voltage input

  • Accuracy: 0.1%

  • Temperature drift:ƒ ‚‚ ± 30 ppm / (ƒ ‚‚ ± 50 ppm / maximum)

  • Input Resistance: 50 (4-20mA/0-20mA/0- ƒ ‚‚ ± 20mA current input)

  • 100(0-10mA/0- ± 10mA current input)

  • 1K(0-1mA/0-‚ ± 1mA current input)

  • 1M(voltage input)

  • Bandwidth: -3 dB 10 Hz

  • Conversion rate: 10 Sps

  • Common Mode Rejection (CMR): 120 dB (1kohm Source Imbalance @ 50/60 Hz)

  • Normal Mode Rejection (NMR): 60 dB (1kohmSource Imbalance @ 50/60 Hz)

  • Input Protection: over-voltage protection, over-current protection

  • Communication: RS-485 protocol or RS-232 standard characters protocols and MODBUS RTU communication protocol Baud Rate (1200,2400,4800,9600,19200,38400 bps) can be selected via software

Address (0 to 255) can be selected via software

  • Communication Response Time: 100 ms maximum

  • Power Supply: +8 ~ 32VDC wide range power supply, internal anti-reverse and over-voltage protection circuit

  • Power Loss: less than 1W

  • Operating Temperature: - 45 ~ +80 deg.C

  • Humidity: 10 ~ 90% (no condensation)

  • Storage Temperature: - 45 ~ +80 deg.C

  • Storage Humidity: 10 ~ 95% (no condensation)

  • Isolation Voltage: input / output: 3KVDC, 1 minute, leakage current:1mA

Which output signal and power supply are common ground.

  • Shock Voltage: 3KVAC, 1.2/50us (peak)

  • Dimensions: 106.7 mm x 79 mm x 25mm


* Tips on getting accurate quotes. Please include product name, order quantity, usage, special requests if any in your inquiry.

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