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 to: 09
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
00 03 00 00 00 01 85 db
Return:
00 03 02 00 01 44 44 // 01 for Address
/ *************************************************************************************** /
Meaning of each byte:
[address 1]
// --------------------------------------------
No. 1 relay is on : 01 05 00 01 01 00 9d 9a
Byte 1: address
byte 2: function
byte 3 4: register address
byte 5 6: register data
byte 7 8: CRC check
/ *************************************************************************************** /
[Address 1]
// --------------------------------------------
0 relay ON: 01 05 00 00 FF 00 8C 3A
0 relay off: 01 05 00 00 00 00 CD CA
// --------------------------------------------
No. 1 relay ON: 01 05 00 01 FF 00 DD FA
No. 1 relay off: 01 05 00 01 00 00 9C 0A
// --------------------------------------------
No. 2 relay open: 01 05 00 02 FF 00 2D FA
No. 2 relay off: 01 05 00 02 00 00 6C 0A
// --------------------------------------------
/ *************************************************************************************** /
off: 01 0F 00 00 00 08 01 00 FE 95
all bright: 01 0F 00 00 00 08 01 FF BE D5
/ *************************************************************************************** /
Read all relay states:
Send: 01 01 00 00 00 08 3D CC
Return: 01 01 01 00 51 88 Relay fully closed
Return: 01 01 01 03 11 89 All relays are on
/ *************************************************************************************** /
Read all input switch status
Send: 01 02 00 00 00 08 79 CC // Read 8 input states
Return: 01 02 01 00 A1 88
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
/ *************************************************************************************** /
Setting address is: 01
00 06 40 00 00 01 5c 1b
Setting address is: 02
00 06 40 00 00 02 1c 1a
Read address
00 03 40 00 00 01 90 1b
/ *************************************************************************************** /
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)
0,003,000,800,010,419 [years] // broadcast read (only by one device to address all practical, easy to test)
00 03 00 10 00 01 84 1e [when] // sub broadcast read (only by one device to address all practical, easy to test)
Read the hardware version (PCB version)
0,003,002,000,018,411 // broadcast read (only by one device to address all practical, easy to test)
/ *************************************************************************************** /
[1 Address]
Open relay 1
01 05 00 01 01 00 9d 9a
Relay 1 closed
01 05 00 01 00 00 9c 0a
No. 2 relay open
01 05 00 02 01 00 6d 9a
No. 2 relay closed
01 05 00 02 00 00 6c 0a
3 relay open
01 05 00 03 01 00 3c 5a
3 Relay Off
01 05 00 03 00 00 3d ca
No. 4 relay open
01 05 00 04 01 00 8d 9b
4 Relay Off
01 05 00 04 00 00 8c 0b
Quanmie
01 05 00 ff 00 00 fd fa
All light
01 05 00 ff ff ff fc 4a
[2 Address]
Open relay 1
02 05 00 01 01 00 9d a9
Relay 1 closed
02 05 00 01 00 00 9c 39
No. 2 relay open
02 05 00 02 01 00 6d a9
No. 2 relay closed
02 05 00 02 00 00 6c 39
3 relay open
02 05 00 03 01 00 3c 69
3 Relay Off
02 05 00 03 00 00 3d f9
No. 4 relay open
02 05 00 04 01 00 8d a8
4 Relay Off
02 05 00 04 00 00 8c 38
Quanmie
02 05 00 ff 00 00 fd c9
All light
02 05 00 ff ff ff fc 79
/ *************************************************************************************** /
No. 1 relay 1 channel status
01 01 00 01 00 04 6c 09
No. 1 Relay 2 channel status
01 01 00 02 00 04 9c 09
Relay 1 3 Channel status
01 01 00 03 00 04 CD C9
4 channel relay 1 status
01 01 00 04 00 04 7C 08
/ *************************************************************************************** /
Read the status of all input interfaces
01 02 00 00 00 00 78 0a