Re: StreamDevice response parsing and redirection

["Zimoch Dirk \(PSI\) via Tech-talk" <tech-talk at aps.anl.gov>]

I have implemented a bit sum. Pushed as version 2.8.22.
Use either %<bitsum> or %<bitsum8> for a one byte sum, %<bitsum16> for a 2 byte sum or %<bitsum32> for a 4 byte sum. (If
the sum is too large for its representation, the higher bytes will be dropped, as usual.)
I hope I implemented it correct ;-)

Dirk

On Thu, 2021-11-11 at 05:11 -0500, Josh Fiddler wrote:
> Dirk: thanks. 
> 
> On Thu, Nov 11, 2021 at 3:28 AM Zimoch Dirk (PSI) <dirk.zimoch at psi.ch> wrote:
> 
> Yes. Just the byte sequence. I just used the representation for convenience. 
> 
> > .. or isn't this the string "A1 61 00 00 00 05 DC 02 58 00 11 00 0D" but really only the byte squence?
> > 
> > In that case:
> > I do not have a bitsum yet. But if I had, it would look like:
> 
> Okay. A bitsum method isn’t implemented. Hmmm. But this is helpful nonetheless. 
> > 
> > terminator = 0x0d;
> > set_A_AND_I {
> >     out 0xa1 0x61 0x00 0x00 0x00 "%2r%(\$1:CURRENT)2r%<bitsum>";
> >     in  0xa1 0x0a 0x00 0x00 0x00 "%=2r%(\$1:CURRENT)=2r%<bitsum>";
> > }
> > 
> 
> I think you got it. 
> > I use redirection for the second value (current) while taking the first (voltage) from the active record. The reply
> > is
> > checked for correctness with %= against the current settings. (I hope I understood this right.)
> 
> Any thoughts on the extraction of specific bytes from the response? An ‘aai’ record perhaps?
> 
> > > > The response would contain the same first 2 bytes, with the 3rd now 0A to show is a response. In the parameter
> > > > response, the 4th and 5th bytes represent the system state when each is converted to a binary representation,
> > and
> > > > each
> > > > bit indicates some status. 
> > > > 
> > > > The ask:
> > > > 
> > > > How can I extract this information and use it?  Should I use record redirection to put the values and
> > formatters? 
> > > > 
> > > > Could someone point me in the right direction? 
> > > > 
> > > > Thanks for reading. 
> > > > 
> > > > I also have another question here that I could use some help with 
> > > > Search: "StreamDevice checksum Methods"
> 
> Thanks again. 
> 
> Josh
> -- 
> 
> 	Josh FiddlerFusion Technician: Controls and Data
> +1-450-245-1065www.f.energy Linkedin