Modbus Rtu 2
Hardware Resources:
* RS485 communication interface * TTL communication interface * 2 optocoupler isolation input * 2 way optocoupler isolation output * A user button * A user LED * A power indicator * A STM32F030F4 microcontroller * 2 relay status indicators LED lights * Power supply terminal interface (12V power supply)
Modbus RTU Instructions:
Baud rate: 9600 8 NONE 1
Hexadecimal send
hexadecimal receive
Operation steps:
1. Software settings communication baud rate
2. Set the address (communication using the device address, the default address is 01)
Set the address from 01 to 09 or from Broadcast to 09
| Hex Byte | Funktion |
|---|---|
| 01 10 00 00 00 01 02 00 09 66 56 | Current address 01 is changed to 09 |
| 00 10 00 00 00 01 02 00 09 6B C6 | Broadcast Address Modified to 09 |
Read Address
| Hex Byte | Funktion |
|---|---|
| 00 03 00 00 00 01 85 db | Send to Device |
| 00 03 02 00 01 44 44 | Receive from Device 01 for Address |
Meaning of each byte:
Byte 1: address
byte 2: function
byte 3 4: register address
byte 5 6: register data
byte 7 8: CRC check
[address 1]
| Hex Byte | Funktion |
|---|---|
| 01 05 00 00 FF 00 8C 3A | 0 relay ON |
| 01 05 00 00 00 00 CD CA | 0 relay off |
| 01 05 00 01 FF 00 DD FA | No. 1 relay ON |
| 01 05 00 01 00 00 9C 0A | No. 1 relay off |
| 01 05 00 02 FF 00 2D FA | No. 2 relay ON |
| 01 05 00 02 00 00 6C 0A | No. 2 relay off |
| 01 0F 00 00 00 08 01 00 FE 95 | Full off |
| 01 0F 00 00 00 08 01 FF BE D5 | all bright |
| 01 01 00 00 00 08 3D CC | Send : Read all relay states |
| 01 01 01 00 51 88 | Return : Relay fully closed |
| 01 01 01 03 11 89 | Return : All relays are on |
| 01 02 00 00 00 08 79 CC | Send : Read all input switch status |
| 01 02 01 00 A1 88 | Return : 8 input states |
Modbus Rtu 4
Specifications:
* RS485 communication interface * TTL communication interface * 4 optocoupler isolation input * 4 way optocoupler isolation output * A user button * A user LED * A power indicator * A STM32F030F4 microcontroller * 4 relay status indicators LED lights * Power supply terminal interface (12V power supply)
Modbus RTU command
Baud Rate: 9600 8 NONE 1
| Hex Byte | Funktion |
|---|---|
| 00 06 40 00 00 01 5c 1b | Setting address is: 01 |
| 00 06 40 00 00 02 1c 1a | Setting address is: 02 |
| 00 03 40 00 00 01 90 1b | Read address |
| Read the software version | |
| 00 03 00 04 00 01 c4 1a | [month] broadcast read (only by one device to address all practical, easy to test) |
| Read the hardware version (PCB version) | |
| 00 03 00 04 00 01 c4 1a | broadcast read (only by one device to address all practical, easy to test) |