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I want to read raw ethernet data from a PC. What software can I use to capture data to and from a TCP/IP server?

In our project we have a PLC that has an ethernet RJ45 socket and serial RS485 plug. In order to control the PLC, we have to capture the data from PLC so that we can work out what commands it is able to transmit and accept.

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closed as not a real question by Randolph West, slhck, Daniel Beck, Nifle, Dave M Jul 15 '12 at 21:30

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Welcome to SuperUser. Please refer to the FAQ, and then edit your question to clarify it, otherwise it will be closed. – user3463 Jul 15 '12 at 17:20
I also would like to suggest that you don't ask programming questions on Super User. We have a site for programming, which is Stack Overflow, but in order to ask there, you should really clarify your post and add details. (And maybe use proper capitalization and spelling) – slhck Jul 15 '12 at 17:35
I have hopefully edited your question to make it more clear as to what you are trying to achieve. If what I have changed makes it radically different from what you are trying to do please edit it as appropriate. – Mokubai Jul 15 '12 at 17:39

Wireshark should suit your requirements.

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