Guys, I need to join 4 positions of this array and only join 1, turning 4x16bits into 64 bits. So basically I need to merge 4 by 4 sequences into just 1 and turn that 4 16-bit data into a 64-bit one. Can you help me? [regs]

Is this still related to the question in the other thread about getting a 64-bit float from 16-bit ints? Did you try what I suggested with the TypedArrays?

https://discourse.nodered.org/t/modbus-tcp-read-32-bit-registers/1710/20?u=thatcadguy

I was able to transform it to 64 bits (with readDoubleBE), but reading one register at a time. Since I have 160 registers and 40 final information, I wanted to make a function that would gather 4 by 4 ModBus read positions and transform the value optimally by arranging it into just one vector to sen…

Looking at your example, try doing "i += 4" instead of "i+4". Also, not sure that you need the ".value" after msg.payload.

The message that appears in debud is this:[fdsfdsf] Looks like it's not incrementing the vector ...

Post some actual data (use the copy button that appears on the right of your debug message when you hover over the data) and the actual function code (not a screen shot but text) placed between two lines of ``` and I will fix it for you. E.g. ``` var blah = "blahdiblah"; ``` This has gone on to…

Never mind. I wrote it out by hand. In future, please provide sample data and something we can copy paste (screen shots are great for looking at only) Sample data I used... [16705,46555,13517,48779,0,0,0,0,16466,25789,26863,40598,0,0,0,0,16589,8742,32208,27469] Function code I wrote... var arrDBE…

@eduardotodero Did this work for you? Perhaps you could mark it as the solution to let future users searching similar requirements know it worked?

Hi guys, By starting from this topic, i need to pick up 4 16bit registers from an instrument connected via Modbus and merge all into an UINT64 integer. Could you please help me to fine a way? thanks a lot.

Have a look at this excellent contrib node: https://flows.nodered.org/node/node-red-contrib-buffer-parser Handling 64bit values with Javascript can be a bit tricky, though. I think you need to use the new BigInt type that should be available in recent NodeJS (>=10) versions. The contrib node alread…

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Convert array of UINT (16bit) numbers to array of Double (64bit) numbers

General

Steve-Mcl 26 August 2020 13:13 12

@ilmisu See answer I posted to a very similar question here

Topic		Replies	Views
Modbus 16bit words to doubleword problems General	4	1016	18 July 2019
How to convert a 16-bit variable to 64-bit General	1	579	1 August 2019
Converting an array of bytes into a int16 to write in a modbus server(holding register) General	33	2053	8 May 2022
Modbus 16 bit registers to Float value General function-node	4	673	28 December 2022
Array Manipulation General	12	555	16 August 2022

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Convert array of UINT (16bit) numbers to array of Double (64bit) numbers

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