Converting modbus hex-data from one register into float

[OnlyOne]

I have different settings for the range here that i can readout:

Solved now with your calculation:

-10V..+10V --> Range=10

-5V..+5V --> Range=5

-1V..+1V --> Range=1

-500mV..+500mV --> Range=0.5

-150mV..+150mV --> Range=0.15

But what to do with:

4mA..20mA

-10mA..20mA

0mA..20mA

-210°C..760°C

270°C..1372°C

...

can the calculation be changed to accept two values?

Thx again.

[crossrulz · Accepted solution]

Try this out:

[OnlyOne]

Hm, found a problem...the given Read- value is a U16 and not  an I16.

What do i have to change?

Thank you

[crossrulz]

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@OnlyOne wrote:

Hm, found a problem...the given Read- value is a U16 and not  an I16.

What do i have to change?

Thank you

---

Are you sure about that?  That would not work for the -10V to +10V range.  Possibly for the temperature one.  In that case, you just need to add by the minimum value instead of the average of the max and min.

[OnlyOne]

I am sure because the open-source modbus-dll that provides the function to read out this register returns an ushort-array.

Here are some values that are displayed in the webinterface for +/- 10V-range:

FFFC = -0,001

F32D = -1,001

E662 = -2,001

BFF7 = -5,001

8CB8 = -9,006

8000 = -10V

-------------

0005 = 0,001

0CD3 = 1,001

199E = 2,001

4008 = 5,003

7340 = 9,006

7FFF = 10V

So it looks like 0V..10V is displayed as 0005x to 7FFFx

and

the negative values are 8000x to FFFFx in opposite order.

But how to put this in a vi including the different ranges?

Thanks

[crossrulz]

---

@OnlyOne wrote:

I am sure because the open-source modbus-dll that provides the function to read out this register returns an ushort-array.

Here are some values that are displayed in the webinterface for +/- 10V-range:

FFFC = -0,001

F32D = -1,001

E662 = -2,001

BFF7 = -5,001

8CB8 = -9,006

8000 = -10V

-------------

0005 = 0,001

0CD3 = 1,001

199E = 2,001

4008 = 5,003

7340 = 9,006

7FFF = 10V

So it looks like 0V..10V is displayed as 0005x to 7FFFx

and

the negative values are 8000x to FFFFx in opposite order.

But how to put this in a vi including the different ranges?

Thanks

---

It is actually using 2's Complement.  By definition, that is an I16.

[OnlyOne]

Thx - 

Now, after everything is working, i found in the module an option to set the return-value to Engeneering-format 🙂

[crossrulz]

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@OnlyOne wrote:

Thx - 

Now, after everything is working, i found in the module an option to set the return-value to Engeneering-format 🙂

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Well, I hope you at least learned something through this experience.