Number conversion

[Rushi119]

i want to decode value from modbus to float LSFR what can i do

[Rushi119]

need to convert unsigned quad to float least significant register format

[pincpanter]

Your post is fully unrelated to this thread (except for using the verb "decode"). Start a new thread instead.

[GerdW]

Hi Rushi,

as a new member you should learn not to post the same question into several (and mostly unrelated old) threads!

Please explain all those terms in your questions: "unsigned quad", "LSFR", "least significant register format".

Please provide examples for input data and expected output result on the desired conversion…

[wiebe@CARYA]

You're probably both replying to spam.

This could be a bot trying to get enough credit to do real damage.

Not entirely sure...

@Rushi119, post what you have. There are dozens of ways to do modbus. The source of the data in important for the solution.

[Rushi119]

Sir I'm using elmeasure energy meter with RS485 communication . but value I'm getting in register is different than the value on meter . when I'm reading meter in modscan using least significant register first format then value I'm getting and value on meter is same .so i need to convert register value  (i.e. in unsigned quad) to least significant register first .

[GerdW]

Hi Rushi,

what does the manual of your device tell you about the register values for that parameter?

Which scaling do you have to apply?

In general all that is mentioned in those manuals, so you need to read them!

[Rushi119]

IN MANUAL THIER IS  A HOLDING REGISTER 03 AND ADDRESS REGISTER IS 157 IM USING THAT REGISTER . THE VALUE IN REGISTER IS CORRECT I NEED TO CONVERT IT INOT LEAST SIGNIFICANT REGISTER FIRST FORMAT .

[GerdW]

Hi Rushi,

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@Rushi119 wrote:

IN MANUAL THIER IS  …

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No need to cry! (Is your keyboard broken?)

Why do you read 74 values when you need just 2 or 4 items?

What does the manual say about scaling of the register values?

[dkfire · Accepted solution]

Maybe you need to show the manual to us. 

But normal Modbus float conversion: