---
title: "Garbage data serial WIZ107SR"
url: "https://maker.wiznet.io/forum/10874"
markdown_url: "https://maker.wiznet.io/forum/10874/md"
type: "Forum topic"
category: "Serial-to-Ethernet & ConfigTool"
author: "SHeijnen"
created: "2015-02-27T16:08:07+09:00"
last_activity: "2017-05-04T08:34:57+09:00"
language: "en"
views: 617
replies: 4
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Garbage data serial WIZ107SR

## Question

Asked by SHeijnen on 2015-02-27 in Serial-to-Ethernet & ConfigTool.

Hello!

Today i received the wiz107SR module and i stumbled upon a problem.
When reading from the ethernet port or my com port i get weird garbage data. See the picture for the serial settings and the garbage data: [drive.google.com/file/d/0B3SCvA … sp=sharing](https://drive.google.com/file/d/0B3SCvArV5X4XZllSMDdPZ0VpNW8/view?usp=sharing)

But when i connect TX and RX from the Wiz107SR and read and write from the ethernet port everything is fine, the usual message appears: LGSEG:CONNECTED and i can write “hello” and receive “hello”.

I’m using a FTDI Usb to serial cable to connect my com port to the Wiz107SR.

COM3 <–> FT232R <–> WIZ107SR <–> Ethernet

I tried numerous things including resetting, uploading other firmware and using other terminal programs but nothing seems to work.

Model name: WIZ107SR
Revision: 1.4
Firmware version 4.04
PC interface: Device terminal 1.0

Thank you in advance!

## Replies

### Reply 1 by eNDi, 2015-03-02

> COM3 ↔ FT232R ↔ WIZ107SR ↔ Ethernet

There are two kinds of WIZ107SR: with RS232 levels on RxD/TxD/RTS/CTS (WIZ107SR has a SIPEX 3232EBE chip on bottom), and with TTL levels (WIZ107SR_TTL). In first case your setup will not work (FT232R has TTL level).

### Reply 2 by SHeijnen, 2015-03-02

That explains alot! The SP3232EBE chip is indeed present on the bottom. The retailer where i bought the module listed the I/O’s as 3.3V - 5.0V so i automatically assumed it was TTL level.

Thanks for the heads-up!

### Reply 3 by eNDi, 2015-03-02

This also happened to me ![:slight_smile:](https://emoji.discourse-cdn.com/twitter/slight_smile.png?v=12)
To convert it to TTL I desoldered the SP3232EBE and closed the corresponding 4 bridges (R38, R39, R40, R41).
Check the newest schematics - RxD, TxD, RTS and CTS are translated, others are TTL. TTL levels on WIZ107SR are 3.3V, inputs are 5V tolerant.

### Reply 4 by SHeijnen, 2015-03-02

Awesome! Just did what you suggested after seeing the schematics and it works like a charm now ![:slight_smile:](https://emoji.discourse-cdn.com/twitter/slight_smile.png?v=12) Guess they’re using the same hardware minus the SP3232EBE for the TTL version ( which makes a lot of sense ![:stuck_out_tongue:](https://emoji.discourse-cdn.com/twitter/stuck_out_tongue.png?v=12) )

Again cheers!

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Source: https://maker.wiznet.io/forum/10874