---
title: "RS232 vs TTL"
url: "https://maker.wiznet.io/forum/11686"
markdown_url: "https://maker.wiznet.io/forum/11686/md"
type: "Forum topic"
category: "Serial-to-Ethernet & ConfigTool"
author: "avi"
created: "2016-02-22T16:49:03+09:00"
last_activity: "2017-05-04T08:38:20+09:00"
language: "en"
views: 844
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# RS232 vs TTL

## Question

Asked by avi on 2016-02-22 in Serial-to-Ethernet & ConfigTool.

Hello,
In the documentation of the user manual [1] page 4 under ordering information it is mentioned that there are 2 versions.
One is RS232 the other is TTL.
Yet the scematics [2] shows that SP3232EBEY is connected so does the TTL version exist?
On mouser we find only the RS232.
How can we order TTL version of the module WIZ107SR-TTL?

[1] [wiznet.co.kr/wp-content/uplo … _V171E.pdf](http://www.wiznet.co.kr/wp-content/uploads/wiznethome/S2E%20Module/WIZ107_108SR/Document/WIZ107SR_UM_V171E.pdf)
[2] [wiznet.co.kr/wp-content/uplo … 7SR_HW.zip](http://www.wiznet.co.kr/wp-content/uploads/wiznethome/S2E%20Module/WIZ107_108SR/Hardware/WIZ107SR_HW.zip)

## Replies

### Reply 1 by Edward, 2016-02-23

Hi.

User’s manual [1] page 4 is just select pin for RS232 & TTL.

TTL version is the right picture.

It is need jumper cap.

refer to below URL.

[wiznet.co.kr/wp-content/uplo … REV1_1.pdf](http://www.wiznet.co.kr/wp-content/uploads/wiznethome/S2E%20Module/WIZ107_108SR/Hardware/WIZ107SR%20INTERFACE%20BOARD%20REV1_1.pdf)

Thank you

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Source: https://maker.wiznet.io/forum/11686