---
title: "WIZ108SR mixed TCP and UDP corrupts data"
url: "https://maker.wiznet.io/forum/10319"
markdown_url: "https://maker.wiznet.io/forum/10319/md"
type: "Forum topic"
category: "Serial-to-Ethernet & ConfigTool"
author: "mikrostar"
created: "2014-06-18T13:55:06+09:00"
last_activity: "2017-05-04T08:33:17+09:00"
language: "en"
views: 541
replies: 4
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# WIZ108SR mixed TCP and UDP corrupts data

## Question

Asked by mikrostar on 2014-06-18 in Serial-to-Ethernet & ConfigTool.

Hi everybody,
We use the WIZ108SR in our projects and more than 20 pieces are installed at customers.
We have been investigating a long time (more than 1 year) to find why error of communications occurred, and I finally found it today:

The scenario is the following:

- PC ask for someting to the client and receive an answer through wiznet module. This happens continuously.

- Sometimes, PC needs to ‘browse’ the network and for this, send a broadcast message with a configuration string (MA, MC, LI, PT, …). Wiznet module answers with its configuration, but DURING THE SAME TIME, client was sending data to the serial interface of the wiznet module.

- When the answer comes to the PC, we see with WireShark that the frame has been corrupted (generally 7 or 8 bytes missing).

This problem can be reproduced at 100%.

How can we solve it? Please help…

[ul]WIZ108SR HW 1.1 FW 2.20
Static ip
Server Mode
Packing time of 3ms
Serial at 115200, N, 8, 1[/ul]

Eric

## Replies

### Reply 1 by irina, 2014-06-20

Hi Eric.
Did you applied H/W flow control options (CTS/RTS)?
If not, I recommend that you apply as possible.
Please post the results reply.

Regards,
Eric.

### Reply 2 by mikrostar, 2014-06-20

Hi,
How is it possible to apply H/W flow control to a 485 type communication?
There is only 4 wires for differential communication…
Best regards
Eric

### Reply 3 by irina, 2014-06-20

Sorry Eric.
I confused with WIZ107SR module.
I will check this problem, then post the reply soon.

Regards,
Eric.

### Reply 4 by mikrostar, 2014-06-28

Hi Eric,
Didi you find a solution or could you reproduce the problem?

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Source: https://maker.wiznet.io/forum/10319