WIZnet Developer Forum

WIZ108SR mixed TCP and UDP corrupts data

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]


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.


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

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


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

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