Description:
1. RS485 communication interface
2. TTL communication interface
3. 2 channel optocoupler isolation input
4. 2 channel optocoupler isolation output
5. A user button
6. A user LED indicator
7. A power indicator
8. A STM32F030F4 microcontroller
9. 2 relay status indicator LED lights
10. Power terminal interface (12V power supply)
شرح :
Modbus RTU instruction
Baud rate: 9600 8 NONE 1
Hexadecimal transmission
Hexadecimal reception
Steps:
1. Software setting communication baud rate
2. Set the address (device address used for communication,the default address is 01)
/*******************************************************************/
Set the address to: 09
01 10 00 00 00 01 02 00 09 66 56 //The current address 01 ismodified to 09
00 10 00 00 00 01 02 00 09 6B C6 //The broadcast address ischanged to 09
Read address
00 03 00 00 00 01 85 db
return:
00 03 02 00 01 44 44 //01 is the address
/*******************************************************************/
/*******************************************************************/
The meaning of each byte:
[Address 1]
//--------------------------------------------
Relay No. 1 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]
//--------------------------------------------
Relay No. 0 is on: 01 05 00 00 FF 00 8C 3A
Relay No. 0 is closed: 01 05 00 00 00 00 CD CA
//--------------------------------------------
Relay No. 1 is open: 01 05 00 01 FF 00 DD FA
Relay No. 1 is closed: 01 05 00 01 00 00 9C 0A
//-------------------------------------------
Relay No. 2 is on: 01 05 00 02 FF 00 2D FA
Relay No. 2 is closed: 01 05 00 02 00 00 6C 0A
//-------------------------------------------
//===============================================================================
Total elimination: 01 0F 00 00 00 08 01 00 FE 95
Full light: 01 0F 00 00 00 08 01 FF BE D5
/**********************************************************************/
Read all relay status:
Send: 01 01 00 00 00 08 3D CC
Back: 01 01 01 00 51 88 Relay fully closed
Back: 01 01 01 03 11 89 All relays are on
/*********************************************************************/
Read all input switch states
Send: 01 02 00 00 00 08 79 CC //Read 8 input states
Back: 01 02 01 00 A1 88
Kit include:
1 X Modbus RTU 2 Channel 12V Relay Module
