(1) Choose Primary if the external
device will probably be accessed
by another device acting as a
secondary master (e.g., a
Communicator). Choose
Secondary if the external device
will probably be accessed by
another device acting as a
primary master.
(2) If you are configuring both Polled
Variable 1 and Polled Variable 2,
use the same Polling Control
setting for both. If you do not, Poll
as Primary will be used for both
devices.