wireshark-dev October 2010 archive
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wireshark-dev: Re: [Wireshark-dev] rs485

Re: [Wireshark-dev] rs485

From: Agustin Figueredo Canosa <dvs_at_nospam>
Date: Tue Oct 12 2010 - 08:37:22 GMT
To: wireshark-dev@wireshark.org

I have no even information about the hardware or software.. All I´m doing
is for my career's final project but the protocol is used by a domotic
company. I dont work for this company so it´s difficult to me to obtain
many information. I have only the description for protocol messages.

They have an aplication that capture rs485 and can save it in file (but no
in pcap file format) so I think I could use this saved files in wireshark
using wiretap.

Is there any information about development with wiretap?
I was looking for it, but I haven't found anything.

Sorry for my english.

>
> On Sep 28, 2010, at 12:56 AM, Agustin Figueredo Canosa wrote:
>
>> I´m working with a link layer protocol using rs485 interface. I have
>> created a dissector for my protocol and it works fine. But now I would
>> like (if possible) to capture packets in real time.
>>
>> I think it´s not possible to capture live data from rs485 using
>> wireshark
>> directly but if anyone have worked in it I'll be grateful for any help.
>
> Ultimately, Wireshark's ability to capture from a traffic source is
> dependent on libpcap/WinPcap's ability to capture from it, which is
> dependent on the OS on which you're capturing and/or the hardware used for
> the capturing. Modern versions of libpcap (for UN*X systems) and WinPcap
> (for Windows) support adding modules to handle various types of capture
> hardware and software (although they're modules compiled into the libpcap
> or WinPcap library, not plug-in modules loaded at run time).
>
> On what operating system or operating systems do you want to do the
> capturing? What software does it have to support RS-485?
>
> What sort of hardware do you have to connect to the RS-485-based network?
> An RS-485-to-USB converter, as you mention, or some other form of hardware
> (such as a serial transceiver)?
>
> Do you want to capture traffic on an RS-485-based network that's neither
> sent to nor from the machine doing the capturing ("third-party" capture),
> or do you just want to capture traffic sent to or from your machine?

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