Status code decoding / partition function

General
1

Hello together,

sorry for my bad english. In the past I could solve problems with Node Red by my own or with reading of this forum but at the moment I'm stuck with a problem or I don't see the obvious solution.

I have a device which sends its status as numeric value (e.g. 84). The device can has multiple status. To "decode" the number there is a table:

1 = status1
2 = status2
4 = status3
8 = status4
16 = status5
32 = status6
64 = status7
128 = status8
256 = status9
512 = status 10

To "decode" the received value of 84 I have to look into the table and strip down as followed:
64 = status7
16 = status5
4 = status3

How can I use a function node to do that in Node-Red? My search in the internet gave me a possible solution called "partition function" or something like this but I have no idea where to start.

It would be very helpful if someone can give me a hint or first sign.

Thank you very much

2

This is more of a binary / bit pattern thing.

If you really want to do it in a function, search for "JavaScript test bit" then test bits 0 ~ 15 to determine if a bit is ON/true of OFF/false

If you want a low-code solution, node-red-contrib-buffer-parser can do the bit testing...

single result

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image750Ă—348 26 KB 

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individual bits...

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image770Ă—257 32.9 KB 

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1 Like
3

Hi Steve-Mcl,

this is EXACT what I am looking for. Awesome, I am trying the whole day to solve that problem and I think to complicated.

THANK YOU SO MUCH

4

Also doable in function node, here are a couple of examples

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[edit] changed one reduce() to map()

1 Like
5

Hello E1cid,

also a big thank to you. This working very well too with only one function node. :+1: :+1: :+1:

Now I have two solutions .....

Thanks to all

1 Like
6

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