4-20ma to RS485 Converter

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.

Features:

• 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

Application:

• 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)

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

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• 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