modbus function codes | modbus function code 3 | modbus read holding registers | modbus full course
Modbus function code 3 is one of the several function codes defined in the Modbus communication protocol. Function code 3 is used for reading multiple registers from a Modbus device, typically in a slave device.
Here's a breakdown of how Modbus function code 3 works:
Request Format:
The request message sent by the master to the slave consists of the following components:
Function Code: 3 (0x03 in hexadecimal).
Starting Address: The register address from where the read operation should begin.
Quantity of Registers: The number of consecutive registers to be read.
Response Format:
Once the slave receives the request and processes it, it generates a response message that includes the following information:
Function Code: 3.
Byte Count: The number of bytes in the response, which is twice the number of registers read.
Register Values: The actual data read from the requested registers, represented in a sequence of bytes.
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