What do these data mean or do they refer to?

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Antonio GA2 asked Oct 28, '18 Joshua S commented Oct 31, '18

What do these data mean or do they refer to?

Create a server to receive flexsim model values and throw this data to me:

1 ===> It's the value that I wrote as an onCover event

0 ===> I do not know if it's because it refers to it using the modbus protocol

6 ===> I think he writes a simple record (16-bits)

-251 ===> I do not know if it refers to byte size

4 ===> It's the registration number

-256 ===> I do not know what it refers to either

My question is ... If I am correct or what does each of the data mean?

Software Version:

FlexSim 18.2.2

emulation modbus tcp coli

captura-de-pantalla-9.png (117.1 KiB)

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Joshua S commented · Oct 29, 2018 at 07:35 PM

When you say it is throwing data at you, is it sending all of this in hex, or line by line? What are you using to capture the data?

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Antonio GA2 Joshua S commented · Oct 30, 2018 at 12:08 AM

@Joshua S,

Line by line in java

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Answer 1 · 2018-10-30T20:18:02Z

Joshua S answered Oct 30, '18 Joshua S commented Oct 31, '18

Modbus protocol has a set of rules for what it does with the information given to it. You are actually missing several 0s which are important to reading the instructions sent to and from a PLC. Before you converted it, the hex format would read as follows

"\x00\x01\x00\x00\x00\x06\xff\x05\x00\x04\xff\x00"

You'll have to look up Modus protocol on what each chunk of bytes does.

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Antonio GA2 commented · Oct 31, 2018 at 12:42 AM

I send him a video, to see how he works

And yes, I already found the modbus tables when it is big-endian and little-endian

video.rar

I perform my tests, changing data and it's like detrining some relationships

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video.rar (1.2 MiB)

Joshua S Antonio GA2 commented · Oct 31, 2018 at 06:46 PM

I would suggest downloading a modbus library that you can run your outputs through, trying to figure out what it is doing hex by hex is going to be tedious work.

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