ProSoft Technology MVI69-HART - Manual (Page 101)

MVI69-HART ♦ CompactLogix Platform Reference
HART Multi-drop Master Communication Module User Manual
ProSoft Technology, Inc. Page 101 of 169
March 29, 2012
In point-to-point mode, the module only polls for a single instrument with a polling
address of zero. When the instrument is found by the channel, it continuously
polls for the data using command 3. Occasionally, it will poll for the configuration
information for the device. This is accomplished with HART commands 13, 14
and 15. Less frequently, the channel will perform a HART command 0 request to
see if any of the data for the instrument has changed. If communications is lost
with the device, the module will try to establish communications with the device
using command 0. If user commands are present and enabled, they will be
executed after each data poll.
When the point-to-point mode of auto-polling is enabled (Auto-Poll Code = P), the
following diagram applies to the channel operation: