---
title: "Modbus/tcp"
url: "https://maker.wiznet.io/forum/12832"
markdown_url: "https://maker.wiznet.io/forum/12832/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "arash"
created: "2018-04-04T10:51:29+09:00"
last_activity: "2018-04-17T14:44:30+09:00"
language: "en"
views: 2273
replies: 4
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Modbus/tcp

## Question

Asked by arash on 2018-04-04 in Ethernet Chips.

Good day
I want to connect a MCU to Modbus/TCP network. can i use W5100S? Which chip is the best for this?

## Replies

### Reply 1 by Eugeny, 2018-04-04

Why not? You just need [Modbus](https://en.wikipedia.org/wiki/Modbus) driver over TCP.

### Reply 2 by arash, 2018-04-04 (in reply to reply 1)

thanks for reply.
My project will work in industry environment, W5100S or W5500, Which one is better for this case?

### Reply 3 by Eugeny, 2018-04-04

[Comparison matrix](http://www.wiznet.io/product/tcpip-chip/). If you will really use the device for industrial applications (which have more strict requirements than consumer/hobbyist), then you should look for the specialists who will be responsible for proper hardware and software design, as well as compliance to requirements.

### Reply 4 by 4jochen, 2018-04-17

I personaly would opt for the W5500 (~ 2014) with 8 sockets and a smart hardware ring buffer engine making it very code effective and high performing.
The new W5100S (2018) is a 1:1 re-build of the old W5100 (~ 2007) and limmited to 4 sockets.
Very nice, but I stay with the W5500.
All chips by WIZnet are very good for industrial applications in temperature (-40°C - +85°C) and stability.
A lot of industrial customers use all this chips successfully.

B) Does anyone can recommend a small and good “bare metal” Modbus Server implementation I can use for a ARM Cortex M0 or M3 + W5500 ?

best regards, Joachim

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Source: https://maker.wiznet.io/forum/12832