CoolAutomation Modbus Integration Guidelines for CoolMasterNet, CooLinkNet, CooLinkHub

Guidelines for configuring Modbus RTU and Modbus IP connections on CoolAutomation devices such as CoolMasterNet, CooLinkNet, and CooLinkHub.

Brand: Cool Automation
Category: Automation control Equipment
Document type: User Manual
Language: English
Pages: 43
File format: PDF
File size: 638 KB
Published: 28 September, 2026
Updated: 28 September, 2026
MD5 checksum: 1A2E9D3323587FBBEC26291C7BB1637D
PDF: CoolAutomation Modbus Integration Guidelines for CoolMasterNet, CooLinkNet, CooLinkHub PDF

About this manual

This document explains how to connect CoolAutomation devices to Modbus networks. It covers both Modbus RTU (two‑wire RS‑485) and Modbus IP (Ethernet) connections, recommended wiring, and line assignments for CoolMasterNet, CooLinkNet and CooLinkHub devices.

It also details configuration commands, virtual address (VA) handling, Modbus tables, command reference syntax, and the optional legacy CoolGate mode. The guide includes default settings, how to change them, and examples of command usage.

What's inside

Connection
Configuration
VA's Configuration
Modbus Tables
Commands Reference
Legacy CoolGate Mode

Specifications

Default Modbus RTU frame format	9600_8N1
Default Modbus slave address	0x50 (80 decimal)
Default Modbus TCP/IP port	502

Frequently asked questions

What is the default Modbus RTU frame format?

It is 9600 baud, 8 data bits, no parity, 1 stop bit (9600_8N1).

Which CoolAutomation devices support Modbus IP?

CoolMasterNet and CooLinkHub support Modbus IP; CooLinkNet does not.

What is the default Modbus TCP/IP port number?

The default port is 502, which can be changed with the "modbus server port" command.

Download PDF (638 KB)