RE: Unsigned language in the pvAccess protocol spec

[<jam...@di...>]

Thanks, in that case this is more accurate:

"Unsigned integers are supported by the pvData serialization protocol itself. However, the pvData API does not support unsigned integers as a first-class concept. The pvData API will include standardized facilities for user level code at server and client sides, to communicate the sign of given integer types. Therefore, as a practical matter for deployers, that a given value should be interpreted as unsigned or signed, is supported by EPICS V4."

James

> -----Original Message-----
> From: mat...@gm... [mailto:mat...@gm...] On Behalf
> Of Matej Sekoranja
> Sent: 17 January 2012 12:10
> To: Rowland, James (DLSLtd,RAL,DIA)
> Cc: gr...@sl...; epi...@li...
> Subject: Re: Unsigned language in the pvAccess protocol spec
> 
> > I'm not clear from Marty's message about unsigned where the extra bit to
> signal unsigned on a type (not on a value, it's part of Field) is stored. It
> would make sense to me to store it in the pvData type descriptor, as there is
> a spare bit in the scalar type code.
> 
> If the flag will be supported, then this is my plan how to encode it (and send
> over the wire).
> 
> > Is it really sent in a separate data stream over pvAccess?
> 
> No.
> 
> Matej

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