8-channel Pt100/Pt1000 to RS-485/232, thermal resistance temperature Modbus data acquisition module WJ225

Product overview:

WJ225 product realizes multi-channel signal acquisition between sensor and host to detect temperature signal. WJ225 series products can be used in RS-485 bus industrial automation control system, temperature signal measurement, monitoring and control, etc.

The products include power isolation, signal isolation, linearization, A/D conversion and RS-485 serial communication. Each serial port can connect 255 W1J25 series modules at most. The communication mode adopts ASCII code communication protocol or MODBUS RTU communication protocol. The address and baud rate can be set by code and can be hung on the same RS-485 bus with the control modules of other manufacturers, which is convenient for computer programming.

WJ225 series products are intelligent monitoring and control systems based on single chip microcomputer. All user set configuration information such as calibration value, address, baud rate, data format, parity check, etc. are stored in non-volatile memory EEPROM.

WJ225 series products are designed and manufactured according to industrial standards. They are isolated between signal inputs/outputs and can withstand 1000VDC isolation voltage. They have strong anti-interference ability and high reliability. Operating temperature range - 45 ℃~+85 ℃.

Product features:

● Pt100/Pt1000 thermal resistance isolation conversion RS-485 output

● Standard 3-wire measurement method, automatic long wire compensation

● 12 bit AD converter is adopted, and the measurement accuracy is better than 0.1%

● The accuracy of calibration module can be programmed through RS-485 interface

● Isolation withstand voltage between signal input/output 1000VDC

● Wide power supply range: 8~32VDC

● High reliability, convenient programming and easy application

● Standard DIN35 guide rail installation, convenient for centralized wiring

● User can program module address, baud rate, etc

● Support Modbus RTU communication protocol and automatically identify protocol

● Industrial flame-retardant enclosure, RS485 port surge protection

● AD conversion rate can be programmed

Typical applications:

● Pt100 temperature signal measurement

● RS-485 remote I/O, data acquisition

● Intelligent building control, security engineering and other application systems

● RS485 bus industrial automation control system diagram 1 WJ225 module appearance diagram

● Industrial field signal isolation and long line transmission

● Equipment operation monitoring

● Measurement of sensor signal

● Acquisition and recording of industrial field data

● Development of medical and industrial control products

WJ225 general parameters:

(typical @+25 ℃, Vs is 24VDC)

Input type: Pt100 input/Pt1000 input

Measuring temperature range: - 200~600 ℃

Accuracy: 0.1%

Temperature drift: ± 50 ppm/℃ (± 100 ppm/℃, maximum)

Bandwidth: - 3 dB 10 Hz

Conversion rate: 10 Sps (factory default, user can send command to modify conversion rate.)

You can set the AD conversion rate to 2.5 SPS, 5 SPS, 10 SPS, 20 SPS by sending a command. (Channel conversion rate=AD conversion rate/number of channels opened)

Note: Please recalibrate the module after modifying the conversion rate, otherwise the measured data will have deviation. You can also indicate the conversion rate when ordering, and we will recalibrate the product according to your required conversion rate when it leaves the factory.

Common mode rejection (CMR): 120 dB (1k Ω Source Imbalance @ 50/60 Hz)

Normal mode rejection (NMR): 60 dB (1k Ω Source Imbalance @ 50/60 Hz)

Input terminal protection: over-voltage protection, over-current protection

Communication: protocol RS-485/RS-232 standard character protocol and MODBUS RTU communication protocol

Baud rate (2400, 4800, 9600, 19200, 38400, 57600, 115200bps) can be selected by software

The address (0~255) can be selected by software

Communication response time: 100 ms maximum

Working power supply:+8~32VDC wide power supply range, internal anti reverse connection and overvoltage protection circuit

Power consumption: less than 1W

Operating temperature: - 45~+80 ℃

Operating humidity: 10~90% (no condensation)

Storage temperature: - 45~+80 ℃

Storage humidity: 10~95% (no condensation)

Isolation withstand voltage: between input/output: 1KVDC, 1min, leakage current: 1mA

RS-485 output and power supply share the same ground.

Impulse withstand voltage: 1KVAC, 1.2/50us (peak value)

Overall dimensions: 120 mm x 70 mm x 43 mm