Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Wed, 20 Jun 2018 12:48:40 -0500

Hi Eric,

Cleaning out my INBOX after last week's meeting, sorry for the delay
responding...

On 05/30/2018 03:40 PM, Eric Norum wrote:
> The ‘-0x’ option doesn’t seem to affect mbbi RVAL readout.  The first
> record below is a longin, the others are mbbi:
...
> I tried adding ‘-n’ to the options but that made no difference.  The
> mbbi .RVAL values are printed in base 10, not base 16.  
> Not a big deal, but does seem a little weird.  Could it be that this is
> happening because the conversion to a string is happening at the IOC
> rather than the client (camonitor) end?

The -0x option only applies to PVs that are native integer types.
Unfortunately RVAL is a DBF_ULONG, and since CA doesn't support unsigned
types it gets presented to the CA server as the next larger type, which
is a DBF_DOUBLE, and as a result the -0x doesn't apply to it:

> tux% cainfo anj:mbbi3.RVAL
> anj:mbbi3.RVAL
>     State:            connected
>     Host:             tux.aps.anl.gov:5064
>     Access:           read, write
>     Native data type: DBF_DOUBLE
>     Request type:     DBR_DOUBLE
>     Element count:    1

This is the same issue we've seen many times before...

- Andrew

-- 
Arguing for surveillance because you have nothing to hide is no
different than making the claim, "I don't care about freedom of
speech because I have nothing to say." -- Edward Snowdon

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System