Product Features

◆ DC7-30V wide voltage power supply

RS485 communication isolation

The communication interface supports RS232 RS485。

◆ Supports standard Modbus protocol and ASCII/RTU format

The measurement chip adopts a 24 bit AD converter, with an accuracy of 0.02 degrees

PRODUCT FUNCTION

◆ 12Road PT100 acquisition channel

◆Supports 5-digit addressing addresses;

Product Selection

Main parameters:

Mechanical dimensions and installation

Adopting a guide rail installation method
Interface Description:

wire connectionway

PT100 adopts a three wire wiring method

Address Description

1. When all five dialing codes are dialed to the "ON" position, it is the address "1";

2. When all five dialing codes are dialed to the "OFF" position, it is the address "32";

3. The leftmost 1 is the binary lowest bit;
4. Address table.

WiFi Description

The WiFi module has four modes

1. Default mode: The WiFi module serves as a hotspot and can be controlled by connecting to WiFi on a computer or mobile phone. It can also be connected through a network port.

2. WiFi AP to serial port conversion: WiFi can only be used as a hotspot. Connect to WiFi using a phone or computer, and control the module using the phone or computer.

3. Ethernet to serial port: Connect the module to a router or server via Ethernet cable. The module can be communicated through a computer or mobile phone connected to this router or server. (First, connect to WiFi for configuration)

4. WiFi Client to Serial Port: Configure the WiFi module to client mode and connect wirelessly to the router or server. Can communicate with other devices under this route.

Quick instructions for using each mode

Configuration interface:

Example of Communication Instructions

This product supports standard Modbus instructions. For detailed instruction generation and parsing methods, please refer to the register table in this article and consult the "MODBUS Protocol Chinese Version".

Modbus protocol Chinese version reference: http://pan.baidu.com/s/1hqsuZNu

This product also supports Modbus ASCII/RTU format.

Application example and explanation: In addition to the dip switch address, the default broadcast address for this device is 254. When there is only one device on the bus, there is no need to worry about the dip switch address. Simply use the 254 address. When there are multiple devices on the bus, select different addresses through the dip switch and send control instructions based on address differentiation.

Instruction generation instructions: For instructions not listed in the table below, users can generate them themselves according to the Modbus protocol. For reading and writing relay coils, it is actually reading and writing coil registers in the Modbus register. The address of the relay register has been explained in the previous text, and users only need to generate read and write instructions for register operations. For example, reading or writing the status of relay 1 is actually a read/write operation on the coil register 0001 corresponding to relay 1.

Detailed explanation:

1: Analog quantity query

Query the temperature of the first channel

FE040000000125C5

Simulated return information:

FE 04 02 00 00 AD 24

Test software description

http://pan.baidu.com/s/1o6r2PNc(Software video tutorial link and instructions for using each mode)

Software functions:

Using a computer as the server, perform the following operations on the module

Monitoring temperature

Common problems and solutions

1. Unable to establish communication using WiFi after the relay board is powered on

Reset WiFi module. Connect again with this link.

2. Unable to communicate with computer (phone)

Check if the configuration is correct.

3. No action after sending the command

Check if hexadecimal code is being sent

Is the code correct

4. I configured Ethernet mode and tried to configure it to another mode, but found that I couldn't connect to WiFi

Configure the WiFi module after resetting it