Remote focus and iris are not possible on the DVX100A, it only showed up in the DVX100B. It is not LAN-C control. I don't know of another inexpensive controller outside of Varizoom that is able to control these functions. I do know of others that cost more.
Jan Crittenden Livingston
Product Manager, HPX500, HPX300, HPX170, HVX200A
Panasonic Broadcast & TV Systems