Modbus protokoll rs485

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

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

/***************************************************************************************/ [Mod Bus 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 ON:  01 05 00 02 FF 00 2D FA No. 2 relay off:  01 05 00 02 00 00 6C 0A /******************************************** 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 ******************************************* / 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