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Converting floating-point MMS

asked 2021-10-06 15:24:27 +0000

Zebacking gravatar image

updated 2021-10-06 16:26:44 +0000

Hello everyone,

in a MMS trace, I've got the analogs measures in a kind of a hexa format, how to convert to wireshark show as the sender is sending?

floating-point: 0843adb762

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Which protocol is that and in which field of that protocol? Sharing a capture with the info would help enormously, post it on a public share and amend your question with a link to it.

grahamb gravatar imagegrahamb ( 2021-10-06 15:29:12 +0000 )edit

Hello, sorry for not sharing a pic, I've edited my post, the protocol is MMS from IEC 61850. Thanks

Zebacking gravatar imageZebacking ( 2021-10-06 16:27:23 +0000 )edit

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answered 2021-10-07 08:31:05 +0000

grahamb gravatar image

Apparently MMS floating point values come in several flavours and only one of them is dissected as a float, others just show the hex bytes as displayed in your picture.

However, it looks as if that field does fit the requirements to be dissected as a float, i.e. the first byte is 0x08 and there are 4 other bytes, what version of Wireshark are you using?

Again if you can provide the capture, rather than an image, this can be looked at in more detail, i.e. using a debugger.

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Asked: 2021-10-06 15:24:27 +0000

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Last updated: Oct 07 '21

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