The first order of business is to determine the set of operations the
device will have to perform.
A look at the AB300 documentation reveals that there are four
commands that must be supported.
Each command will
be associated with an EPICS process variable (PV) whose type must be
appropriate to the data transferred by the command.
The AB300 commands and
process variable record types I choose to associate with them are shown
in table 1.
Table 1:
AB300 filter wheel commands
CVI Laser Corporation AB300 filter wheel
Command
EPICS record type
Reset
longout
Go to new position
longout
Query position
longin
Query status
longin
There are lots of other ways that the AB300 could be handled. It might
be useful, for example, to treat the filter position as
multi-bit binary records instead.
