www.miinet.com
Moore Industries-International, Inc.
- 47 -
User’s Manual
238-741-00K
May 2019
Programmable Smart HART Temperature Transmitter
THZ
3
/ TDZ
3
SECTION 4
HART Broadcast Messaging (Burst Mode)
When set to burst mode, the THZ
3
/TDZ
3
will proactively send out messages instead of waiting for
the host to request them. This enables event driven communication (high, low, deviation of signal
or change in status) and/or timed communication (every x seconds) to the host.
Note:
When using burst mode in the THZ
3
/TDZ
3
, the host must also be configured to
communicate in burst mode.
Up to 3 different burst messages may be configured independently in the THZ
3
/TDZ
3
. For each
burst message the following parameters need to be configured:
HART Command – determines which parameters are sent in the message
Update Periods – specifies the minimum and maximum time between messages
Trigger – determines what triggers a message to be sent to the host
Slot 1-8 – For HART commands 9 and 3 only, select the device variables for the message
The following HART commands can be selected for the burst message:
Command
Variables in burst message
Trigger Source
1
Primary Variable (PV)
PV
2
Loop current and Percent of Range (POR)
POR
3
Dynamic Variables and Loop Current
PV
9
Device Variables with status
Device Variable in Slot 1
33
Device Variables
Device Variable in Slot 1
48
Additional Device Status
Status bits
Update Periods: The Update and Maximum Update periods determine the minimum and
maximum time interval between each message. The update periods can be set to the following
values:
0.5, 1, 2, 4, 8, 16, 32, 60-3600 seconds
The actual frequency of messages sent will be determined by the update periods and trigger
mode.
If the trigger mode is set to Continuous, then the message will be sent every x seconds where x is
the Update period.
If the trigger mode is set to any other value (i.e. it is looking for a trigger) then the message will be
sent every x seconds (update period) if the trigger condition is met. If the trigger condition is not
met then a message will be sent every y seconds where y is the Maximum Update period. This
ensures that the device and host communicate regularly (once per hour if y is set to the maximum
value of 3600 seconds).
