Experimental Physics and
Industrial Control System

Emmanuel Mayssat <[email protected]> · Mon, 03 Dec 2007 11:57:26 -0800

Dirk, others,

I am trying to write a new converter.
That converter is almost like the RawConvert except:
* the bit order and meaning are the same a C float ( sign + mantissa +
exponent )
* the content is coded on 4 bytes
* Width is not meaningful, big/small endian may be
* Several values should be extracted from the same reply ( 25 ai ). So
devaiStream does not work.

I looked at the existing converter.
A converter has 3 methods parse, print, read/scan.
Parse returns a type (long, double, string, etc.), what is this type
referring to? The input (4*8 bits), the value (float), other ?
I understand that it is used to find the correct print/read methods but
what should it be in my case? 

If Read/scan method returns the # of bytes read, I should be forced to 4
in my case? Is the return value always the number of bytes?

I want to assign the values of several records based on the returned
message. Should I create a custom record with 25 additional fields when
compared to ai and then soft link them to other AI. Is there a way to
use devaiStream and directly populate the 25 records? 

getStatus {
out "GET STATUS"
in  "%(record1.val)R%(record2.val)R%(record3.val)R"
}

Thanks,

--
Emmanuel

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System