Thermocouple temperature signal to RS-485, Modbus data acquisitionmoduleWJ127

Product features:

One thermocouple signal acquisition isolation conversion RS-485 output

Using a 12 bit AD converter, the measurement accuracy is better than 0.1%

Isolation withstand voltage between signal input/output 1000VDC

Wide power supply range: 8~32VDC

K/J/T/E/R/S/B/N type thermocouple input

High reliability, easy programming, and easy application

Standard DIN35 rail installation, convenient for centralized wiring

Users can program module addresses, baud rates, etc

Supports Modbus RTU communication protocol and automatic recognition protocol

Industrial flame retardant shell, RS485 port surge protection

Low cost, small volume modular design

Typical applications:

Temperature signal measurement, monitoring, and control

RS-485 remote I/O, data acquisition

Intelligent building control, security engineering and other application systems

RS-485 bus industrial automation control system

Industrial site signal isolation and long-distance transmission

Equipment operation monitoring

Measurement of sensor signals

Acquisition and recording of industrial field data

Development of medical and industrial control products

Various types of thermocouple signal acquisition

Product Overview:

The WJ127 product implements signal acquisition between sensors and hosts for detecting analog signals. TheWJ27 series products can be applied to RS-485 bus industrial automation control systems, measurement of

K/J/T/E/R/S/B/N thermocouple signals, as well as industrial field signal isolation and long-distance transmission. The product includes power isolation, signal isolation, linearization, A/D conversion, and RS-485 serial

communication. Each serial port can connect up to 255 W1J25 series modules, and the communication methodadoptsASCII code communication protocol or MODBUS RTU communication protocol. The address and baud rate canbesetby code, and can be hung on the same RS-485 bus with control modules from other manufacturers for easy computerprogramming.The WJ127 series products are intelligent monitoring and control systems based on microcontrollers. All user set calibration values, addresses, baud rates, data formats, parity checks, and other configuration information are storedinnon-volatile memory EEPROM. The WJ127 series products are designed and manufactured according to industrial standards, with isolationbetweensignal inputs/outputs. They can withstand 1000VDC isolation voltage, have strong anti-interference ability, andhighreliability. The working temperature range is -45 ℃ to+85 ℃.

Function Introduction:

The WJ127 signal isolation acquisition module can be used to measure one temperature signal. 1、 Temperature signal input 12 bit acquisition accuracy, 1 thermocouple temperature signal input. All signal input ranges have beencalibratedbefore the product leaves the factory. During use, users can also easily program and calibrate themselves. 2、 Communication Protocol Communication interface: 1 standard RS-485 communication interface. Communication Protocol: Supports two protocols, the character protocol defined by the command set andtheMODBUS RTU communication protocol. The module automatically recognizes communicationprotocols and can achieve network communication with various brands of PLCs, RTUs, or computermonitoring systems. Data format: 10 digits. 1 start bit, 8 data bits, 1 stop bit, no checksum. The communication address (0-255) and baud rate (2400, 4800, 9600, 19200, 38400, 57600, 115200bps) canbeset;The communication network can reach a maximum distance of 1200 meters and is connectedthroughtwisted pair shielded cables. High anti-interference design of communication interface, ± 15KV ESD protection, communication responsetimeless than 100mS. 3、 anti-interference Parity check can be set as needed. There is a transient suppression diode inside the module, which caneffectivelysuppress various surge pulses, protect the module, and the internal digital filter can also effectively suppresspowerfrequency interference from the power grid.

Product selection: WJ127 - □ Communication interface 485: Output as RS-485 interface Selection

example 1: Model: WJ127-485 represents thermocouple signal input, and the output is RS-485 interface

WJ127 General Parameters:

(Typical @+25 ℃, Vs is 24VDC) Input type: thermocouple signal input, supports multiple thermocouple signals, K/J/T/E/R/S/B/N type thermocouplesAccuracy: 0.1% (excluding cold end sensor error) Temperature drift: ± 50 ppm/℃ (± 100 ppm/℃, maximum) Input resistance: greater than 1M Ω Cold end compensation sensor accuracy: ± 0.5 ℃ Bandwidth: -3 dB 10 Hz Conversion rate: 10 Sps (factory default value, users can modify the conversion rate by issuing commands.) You can set the AD conversion rate to 2.5 SPS, 5 SPS, 10 SPS, and 20 SPS by sending commands. (Channel conversion rate=AD conversion rate/number of open channels)Note: Please recalibrate the module after modifying the conversion rate, otherwise the measured data mayhavedeviations. You can also specify the conversion rate when placing an order, and we will recalibrate the product according to the conversion rate you require when it leaves the factory. Common mode rejection (CMR): 120 dB (1k Ω Source Imbalance @ 50/60 Hz) Normal mode suppression (NMR): 60 dB (1k Ω Source Imbalance @ 50/60 Hz) Input protection: overvoltage protection, overcurrent protection Communication: RS-485 standard character protocol and MODBUS RTU communication protocol Baud rates (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, with internal anti reverse and overvoltage protectioncircuits Power consumption: less than 1W Working temperature: -45~+80 ℃ Working humidity: 10~90% (no condensation) Storage temperature: -45~+80 ℃ Storage humidity: 10~95% (no condensation) Isolation withstand voltage: 1KVDC between input/output, 1 minute, leakage current 1mA The RS-485 output and power supply are grounded together. Surge resistant voltage: 1KVAC, 1.2/50us (peak value) Dimensions: 106 mm x 59mm x 24mm