---
title: "What to do with unused ports?"
url: "https://maker.wiznet.io/forum/9985"
markdown_url: "https://maker.wiznet.io/forum/9985/md"
type: "Forum topic"
category: "Serial-to-Ethernet & ConfigTool"
author: "gthompson"
created: "2014-02-25T20:01:22+09:00"
last_activity: "2017-05-04T08:31:37+09:00"
language: "en"
views: 676
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# What to do with unused ports?

## Question

Asked by gthompson on 2014-02-25 in Serial-to-Ethernet & ConfigTool.

If I’m only using two serial ports on the WIZ140SR, what should I do with the other two? Are they pulled up on the module, or should I pull them up on my board? Similarly, if I’m not using CTS, should I pull it up on my board or can I leave it unconnected?

Gary

## Replies

### Reply 1 by jbkim, 2014-02-26

You don’t need to pull-up or pull-down on unused port.

Thanks,
JB

---

Source: https://maker.wiznet.io/forum/9985