---
title: "RS-485 witth WIZ120SR or WIZ127SR"
url: "https://maker.wiznet.io/forum/9641"
markdown_url: "https://maker.wiznet.io/forum/9641/md"
type: "Forum topic"
category: "Serial-to-Ethernet & ConfigTool"
author: "qrgc1"
created: "2013-10-21T15:53:21+09:00"
last_activity: "2017-05-04T08:30:23+09:00"
language: "en"
views: 706
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# RS-485 witth WIZ120SR or WIZ127SR

## Question

Asked by qrgc1 on 2013-10-21 in Serial-to-Ethernet & ConfigTool.

The WIZ127SR explicitely claims to support RS-485 by providing the direction signal by RTS while CTS is ignored. May I use the WIZ120SR and apply CTS active or should I better employ the WIZ127SR. For the WIZ127 the manual informs about the exact positions of the 3 12-pin headers J1, J2 and J3 but does not tell which is which and on the photo, one of them is unpopulated. Is that module ready?

## Replies

### Reply 1 by ywkwon, 2013-11-07

Hello,

Please refer to below image and “2.4.2 RS485/422” section of user manual version 1.11.
[attachment=0]pin_wiz127sr.jpg[/attachment]

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Source: https://maker.wiznet.io/forum/9641