Table 10-3: Options for burst message contents (continued)
HART
command
Label Description
ProLink III Field communicator
2 Primary Variable
(Percent Range/Current)
Pct Range/Current The transmitter sends the PV’s actual mA level and
the PV’s percent of range in each burst message
(e.g.,11.0 mA 25%).
3 Process Variables/
Current
Process Vars/Current The transmitter sends the PV’s actual milliamp
reading and the PV, SV, TV, and QV values in
measurement units in each burst message (e.g.,
11.8 mA, 50 g/sec, 23 °C, 50 g/sec, 0.0023 g/cm
3
).
9 Read Device Variables
with Status
Device Variables with
Status
The transmitter sends up to eight user-specified
process variables in each burst message.
33 Transmitter Variables Field Device Vars The transmitter sends four user-specified process
variables in each burst message.
48 Read Additional
Transmitter Status
Read Additional Device
Status
The transmitter sends expanded device status
information in each burst message.
4. Depending on your choice, select the four or eight user-specified variables for the burst message, or
set the HART variables as desired.
Important
If you change the HART Primary Variable (PV) or Secondary Variable (SV), the process variables
assigned to the primary mA Output and the secondary mA Output (if applicable) are automatically
changed to match. The PV cannot be changed on devices with fixed mA Output assignments.
Configure HART trigger mode
ProLink III
Device Tools → Configuration → Communications → Communications (HART)
Field communicator Configure → Manual Setup → HART → Burst Mode → Burst Message x → Configure Update Rate
Trigger mode uses the burst message mechanism to indicate that a process variable has changed. When
trigger mode is implemented, the bursting interval (HART update rate) changes if Primary Variable or
Burst Variable 0 moves above or below the user-specified trigger level. You can set up a different trigger on
each burst message.
Prerequisites
Before you can configure trigger mode, the corresponding HART burst message must be enabled.
Restriction
This feature is available only with a HART 7 host.
Procedure
1. Select the burst message for which you will set up trigger mode.
2. Set Trigger Mode to the type of trigger you want to use.
Integrate the meter with the control system Configuration and Use Manual
March 2021 MMI-20020954
98 Micro Motion Gas Specific Gravity Meters (SGM)
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