Experimental Physics and
Industrial Control System

[email protected] · Fri, 26 Nov 1999 15:19:38 +0100 (MET)

  > - can I upgrade just this record, or does it need new features of
  >   this release ?

mbboDirect.c is unchanged, only the .dbd has been changed. So replacing
the dbd and running a "make" in src/rec to install it should do the job.
You won't even have to rebuild any other parts of base, but you will
have to re-generate the dbd file that your IOC loads and reboot the IOC
to make the change work.

  > - is there another way to write a value to this record so that it
  >   sets all its outputs at the same time ?

No. (Well, at least not by using Channel Access...)

  > If this did not work before - ( and it has been around a few years)
  > I can't understand what was the use of this record ?

mbboDirect is used (~520 times in our installation) to combine single
command bits into a status word:

command1 (bo) OUT  --PP-NMS-->  B0      
command2 (bo) OUT  --PP-NMS-->  B1 commandWord (mbboDirect) OUT  --->  Hardware
command3 (bo) OUT  --PP-NMS-->  B2      

You don't have to set all bits at the same time in this case.

In cases where we have to set the command word as a whole we don't use
the mbboDirect, but a calc record (to gather/shift/invert the command
word) that writes to a longout record accessing the hardware.

Ralph

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System