Experimental Physics and
Industrial Control System

In working with the value types of a MBBI, I noticed that the native type of the mbbi values is DBF_DOUBLE even though the documentation states ULONG. When a connection handler completes a connection with those attributes it returns the DOUBLE type.  Also, when a caget with the –D option is executed the following is displayed.

 

>  caget –d DBR_LONG <PV NAME>.ZRVL

 

<PV NAME>.ZRVL

     Native Data Type:     DBF_DOUBLE

     Request Type:         DBR_LONG

     Element Count:        1

     Value:                0

 

However a caput with a double value does get truncated during the put.  Which makes sense as these values should be integers. So why is the native type a double?  Currently I am basing display of data by the EPICS type.  So this data is shows as a decimal value because it comes back as a DOUBLE.

We can code for this configuration but I was just curious as why the native type for MBBI values was set to DOUBLE.

 

Thanks