Modbus Client Read

Overview

Modbus Client Read node reads values from a Modbus device using a configured setup tool.

Supports common Modbus read function codes for coils, discrete inputs, and registers.

Input

Setup Tool

required

Reference to Modbus Client Initialization containing connection configuration.

Function Code

integer required

Read operation code:

• 1 Read Coils
• 2 Read Discrete Inputs
• 3 Read Holding Registers
• 4 Read Input Registers

Pick the function code based on the memory type your device exposes.

Register Data Format

string

Data decoding format for register reads.

Used when Function Code is 3 or 4 to control how raw register values are interpreted.

Start Address

integer required

Starting register/coil offset for the read operation.

Addressing is base-0, so values may differ from one-based addresses shown in vendor manuals.

Number of Values

integer required

Number of contiguous values to read starting at Start Address.

Number of Read Attempts

integer required

Maximum retry attempts for this read call before reporting failure.

Wait for Completion

boolean advanced

If enabled, flow waits for the read response before proceeding.

Disable for asynchronous behavior when immediate downstream execution is preferred.

Output

Is Pending

boolean

true while async read is still running.

Response Code

integer

Response code from Modbus operation.

Read Values

array

Array of values read from the device.