4-20mA to Network Modbus TCP and Mqtt TCP Network, Data Collection Mes System

Product Overview

4-20mA or 0-10V to network Modbus TCP and MQTT, WiFi acquisition module

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Core Features

Convert 4-20mA signal to standard Modbus TCP protocol
Supports TCP Server, UDP, MQTT protocols
Built-in web page for data query and parameter setting
Standard DIN35 rail installation
High reliability and easy programming

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Technical Specs

Wide power supply range: 8~32VDC
Accuracy: 0.1%
16-bit acquisition accuracy
Dimensions: 79 x 69.5 x 25mm
Operating Temp: -45℃ to +80℃

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Basic Information

Model NO.	WJ321	Integration	GSI
Resolution	12 Bit / 16 Bit	Shape	DIP / Rail Mount
Technics	Semiconductor IC	Operating Temp.	-40℃ - 85℃

Model Selection Guide

Input Signal Type	Antenna Type	Output Interface
U1:0-5V / U2:0-10V / U3:0-75mV A3:0-20mA / A4:4-20mA	W: External antenna N: Built-in antenna X: Suction cup antenna	WiFi Network Interface

Typical Applications

Industrial automation control systems based on TCP
Signal measurement, monitoring, and MQTT reporting
Equipment operation monitoring and MES systems

Industrial site signal isolation and long-distance transmission
Intelligent building control and security engineering
Acquisition and recording of industrial field data

General Parameters

Input & Accuracy

Accuracy: 0.1%
Temperature drift: ± 50 ppm/℃
Input resistance: 150 Ω (4-20mA) / >200K (5V/10V voltage input)
Bandwidth: -3 dB 10 Hz
Conversion rate: 16FPS (Default, adjustable from 2SPS to 100SPS)

Communication & Protection

Protocol: MODBUS TCP / TCP Socket / MQTT
Response time: ≤ 100 ms
Input protection: Overvoltage and Overcurrent protection
Anti-interference: Internal transient suppression diode (TVS)
Power Consumption: < 3W

Application Setup

Frequently Asked Questions

1. What communication protocols does the WJ321 module support?

The module supports MODBUS TCP, standard TCP Socket character protocols, and MQTT protocol for versatile industrial networking.

2. How is the module configured for network settings?

The WJ321 features a built-in web page interface. Users can easily set the module's IP address, WiFi credentials, and other parameters directly through a web browser.

3. What is the power supply requirement?

It supports a wide DC power supply range from +8V to 32VDC, and includes internal anti-reverse and overvoltage protection circuits.

4. Can I adjust the signal conversion rate?

Yes, the factory default is 16FPS, but users can modify the AD conversion rate to 2SPS, 4SPS, 8SPS, 16SPS, 32SPS, 50SPS, 80SPS, or 100SPS via commands or the web page.

5. What mounting method is used for this module?

The module is designed for standard DIN35 rail installation, which is convenient for centralized wiring in industrial control cabinets.

6. Does the module have any built-in protection against surges?

Yes, it contains a transient suppression diode (TVS) inside to effectively suppress various surge pulses and protect the internal circuitry from interference.