Guide: how to configure CoolMaster for Home Assistant with an RS232-to-Ethernet converter

ashalita · March 7, 2026, 6:28pm

This guide explains how to configure older CoolMaster models that support serial connectivity only and do not include Ethernet. These models likely include the CoolMaster 1000D, 2000S, 3000T, 4000M, 6000L, 7000F, 8000I(MH), 9000H, and G.

gist.github.com

https://gist.github.com/ashalita/8090236e808c99763ec3e75006c68741

gistfile1.md

# How to Configure CoolMaster for Home Assistant with an RS232-to-Ethernet Converter

## Introduction

So you have an older CoolMaster device and you want to use it with Home Assistant. How old? Old enough that it doesn’t have an Ethernet port - only an RS232 port.

It looks like models **1000D, 2000S, 3000T, 4000M, 6000L, 7000F, 8000I(MH), 9000H, and G** all fit this description. So what are your options?

1. **Replace it with a modern CoolMaster device.**  
   This works, but it’s not cheap - prices are typically above $1,000.

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