Modbus Client Initialization

Overview

Modbus Client Initialization node configures a reusable Modbus connection for TCP or RTU communication.

Set this node once, then use Modbus Client Read and Modbus Client Write nodes for runtime operations.

Input

Type

string required

Connection type:

• TCP
• RTU

Choose TCP for Ethernet-connected devices and RTU for serial bus devices.

Device ID

integer required

Modbus slave ID (unit ID) of the target device.

This value must match the configured ID on the remote Modbus device.

Number of Connection Attempts

integer required

Maximum number of connection retries before initialization fails.

TCP Fields

string

When Type is TCP, configure:

• Host
• Service (port)
• TCP Response Timeout

These fields define where and how quickly the client expects TCP responses.

RTU Fields

string

When Type is RTU, configure:

• RTU Port
• Baud Rate
• Data Bits
• Parity
• Stop Bits

These values must match the serial settings on the RTU device exactly.

With Setup Write

boolean

If enabled, performs an initial write sequence during setup before runtime read/write nodes execute.

Setup Write Values

array

Write payload list used by setup write operation.

Use this to preload registers/coils to a known startup state.

Output

This node does not provide custom output fields.