modbus function code 2 | Read Discrete Inputs | modbus function codes explained | modbus lecture |
Function code 2, also known as "Read Discrete Inputs," is one of the function codes defined in the Modbus protocol.
Function code 2 is used to read the status of discrete inputs from a Modbus device. Discrete inputs represent digital signals that are typically used to monitor the state of sensors or switches. These inputs can only be in one of two states: ON or OFF.
When using function code 2, the Modbus master sends a request to the slave device to read the current status of discrete inputs. The request includes the starting address of the input register and the number of inputs to be read. The slave device responds with the requested data.
Here's a breakdown of the structure of a Modbus function code 2 request:
Function code: The function code is set to 2, indicating that it is a read discrete inputs operation.
Starting address: This field specifies the address of the first discrete input to be read. The address is typically a 16-bit value.
Quantity: This field indicates the number of discrete inputs to be read. It is also a 16-bit value.
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