---
title: "Read register to detect link on W5100?"
url: "https://maker.wiznet.io/forum/11616"
markdown_url: "https://maker.wiznet.io/forum/11616/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "mcguire"
created: "2016-01-22T00:39:20+09:00"
last_activity: "2017-05-04T08:38:05+09:00"
language: "en"
views: 726
replies: 2
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Read register to detect link on W5100?

## Question

Asked by mcguire on 2016-01-22 in Ethernet Chips.

Hi folks. Is it possible to determine if a W5100 has link (i.e., sees carrier) by reading a register? I don’t see anything in the datasheet about it. This would seem to be a relatively important function. ![:wink:](https://emoji.discourse-cdn.com/twitter/wink.png?v=12)

```
       Thanks,
        -Dave McGuire
```

## Replies

### Reply 1 by Coccoliso, 2016-01-22

hi,
you can read this [url][About detection method of disconnection LAN cable](https://forum.wiznet.io/t/about-detection-method-of-disconnection-lan-cable/1780/1)] about this request.

### Reply 2 by mcguire, 2016-01-22

Ok. Thank you for your assistance.

```
     -Dave
```

---

Source: https://maker.wiznet.io/forum/11616