TopWorx HART 7 Communication Protocol


A HART 7 position transmitter option for the TopWorx D-Series switchbox enables advanced diagnostic and monitoring capabilities for valve integrators and automators. It helps improve operational efficiency and maintenance planning for plants in process industries such as oil and gas, chemical, power, and refining.


The HART 7 position transmitter’s easy-to-use LCD display and navigation buttons permit local 5-point calibration for a more accurate setup on linear applications. Advanced diagnostic capabilities include measurements such as percent valve is open/closed, open and close dwell time, valve transition time—from open to close, and last open/close stroke time. 


Device Terminal Voltage10.0 @ 24 to 39V DC
Linearity (1/4 Turn)1% of span
Shaft Rotation20 to180-deg.
Operating Temperature Limits

-40 to 176°F (-40 to 80°C)

Device Resistance and CapacitanceRx: 27.12k ohms | Cx: 6.11nF @950 Hz
High (H) Alarm NE-43 Current22.3mA
Low (L) Alarm NE-43< 3.5mA
Multi-Drop Current Draw4.0mA
Lift-Off Voltage10.0V
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