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 from 01 to 09 or from Broadcast to 09

Read 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]

https://hacktronics.co.in/2-channel-relay-module/modbus-rtu-2-way-relay-output-2-way-input-switch-ttl-rs485-interface-communication

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

[address 1]

[address 2]

[address 1]

https://hacktronics.co.in/4-channel-relay-module/4-channel-relay-module-programmable-w-opto-isolated-rs485-stm8s103f3

DDS578R Energy Meter
MODBUS-RTU communication protocol Description:

1.the data format: Address + function code + data + CRC check code 2.the register type This meter uses two types of registers, individually addressed The first is the data register, read-only, using the command code 0x04 to read. The second category is the parameter register, readable and writable, using the command code 0x03 read, write parameters using 0x10 3.the data format Float type data: Read the internal data within the meter in line with IEEE-754 standardv floating-point number, data format is 32-bit 4-byte single-precision floating-point data format. 4、Data register list