Experimental Physics and
Industrial Control System

Jeffrey Mcdonald <[email protected]> · Thu, 22 Jan 1998 11:10:03 -0600 (CST)

Hi,

	I'm working on a download for svx IIe chips here at Fermilab.  The
chips communicate with the outside world through a port card that sits in
a 10 U/vme64 crate.   When I download the chips, I write to a register 
on the port card 15 parameters.  Once all of these parameters have been
downloaded, I write a command to the port to indicate that I've download
all of the parameters and it can then download that information to each of
the svx chips.   

	I seek some advise on how to code this problem with epics.  I can
have a number of generic vmeRecords, one for each of the parameters and a
record to tell the port card to "download chips".   The order is important
and I would prefer not to do code the download this way, as it would be
easy for users to change the order of the download.  

	I would prefer to have a single record for the download.  However,
I'm not sure how this fits into epics.  I would like the users to perform  
caputs for each of the parameters.  After all of the parameters have been
filled (each would have a field in the record), the user performs 
another caput to indicate that all of the parameters 
have been filled and the record can process by writing to the
proper vme addresses.   This is where I'm not sure how this fits into
epics.  I only want the record to process (write to port card) once, even
while I am performing caputs -- which as I understand causes the record to
process.

	I doubt that this is the first time a problem such as this has
been encountered and I would appreciate any advise as to how to best
approach this problem.  

			Thanks in Advance,

				Jeff
		
_____________________________________________________
Jeffrey McDonald, Florida State   [email protected]
FNAL MS 352			  phone   630-840-8301
Batavia, IL 60510                 fax     630-840-8886

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System