RS485 Communication MODBUS RTU Slave Mode Industrial Remote Control Manual

I. Product Overview

This 485 communication module adopts MODBUS RTU slave mode, mainly used to realize the reading of remote control button values by the upper computer, with stable and reliable communication performance, suitable for various industrial control scenarios.

2, Technical parameters

1. Working Voltage: DC12 - 24V.
2. Static current: 8.5mA at 12V.
3. Operating current: 45mA at 12V.
4. Communication protocol: MODBUS RTU slave mode, supports MODBUS RTU function code "03" (read data register), and the upper computer can read the key value register of 4 bytes through this function code.

III. Communication Configuration

1. Baud rate: 115200.
2. Check Bit: None.
3. Data bits: 8 bits.
4. Stop bit: 1 person.

Communication manual:

4, Module response data frame format

1. AddressOne byte, fixed at 08, cannot be changed.
2. function codeOne byte, only supports function code 03.
3. Read the number of data bytes in the data registerFour bytes.
4. dataFour bytes (34 bits) correspond to the values of 34 buttons on the remote control.
5. Verification: 62 CF.

The above content is the complete product manual for the 485 communication module, which provides detailed information on the module's technical parameters, communication configuration, data frame format, and other key information to help users better understand and use the module.