Experimental Physics and
Industrial Control System

It was originally written to create breakpoints from a table of values for each bit pattern. The thermocouple manufacturers used to provide these. mkbkpt allowed people to create a table that was as precise as they needed.


-----Original Message-----
From: [email protected] on behalf of Andrew Johnson
Sent: Fri 12/17/2010 11:22 AM
To: [email protected]
Subject: Re: Breakpoint Tables

Hi David,

On Thursday 16 December 2010 21:06:06 David Dudley wrote:
>
> So....
> The big format in the bpt*.data files, as specified in section 6.17 isn't
> required?  And I don't have to run the 'makeBpt' command and the stuff
> that's listed in that section?

You don't have to do that if you have your own way of generating the
breaktable(name){raw, eng, ...} that the IOC can load (see 6.11, although I
suspect you have an older copy of the AppDevGuide with different numbering). 
Note that you can load a .dbd file containing break-point table data using
either dbLoadDatabase or dbLoadRecords, and the table data values can be space
or comma-separated.

The makeBpt program described in 6.15 is useful if the calibration data you
have needs to be re-sampled to provide conversions with an acceptable error,
bearing in mind that the IOC code gives you values taken from a straight line
drawn between adjacent data points.  You wouldn't need to run makeBpt manually
since that's all taken care of by the build system when you tell it
        BPTS += bptXxx.dbd
and give it the data table as described in a file named bptXxx.data.

- Andrew
--
If a man is offered a fact which goes against his instincts, he will
scrutinize it closely, and unless the evidence is overwhelming, he will
refuse to believe it.  If, on the other hand, he is offered something
which affords a reason for acting in accordance to his instincts, he
will accept it even on the slightest evidence.  -- Bertrand Russell

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Re: Breakpoint Tables David Dudley

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