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11 HART Communication (only ADT223A)
The Additel 223A has a built-in HART resistor. This HART resistor's current rate is 44mA and its use can be enabled or
disabled.
Note 1: The calibrator can measure current with a range of -30 to 30mA. The calibrator can poll over 15 devices
(address 1 to 15) with an external HART resistor.
Note 2
The calibrator can show primary variable (PV), range ( PV current value (AO), loop current (CA), secondary variable
a third variable and a fourth variable The secondary third and fourth variables are special process variables defined in the
HART diagnostic and service operations will allow you to calibrate a supported HART instrument.
HART setup operations allow you to configure common parameters of a supported HART instrument.
11 2 Connect to a HART Device
To start communication with a HART device, press the HART button and the calibrator will prompt you to select the HAR T
resistor. Figure 11.1 shows the connection with internal built-in HART resistor. Figure 11.2 shows the connections with an
external HART resistor.
To insure the connection is correct refer to Figure 11 1 or 11 2 To start polling and communicating with a HART device
1. After you have selected internal or external resistor prompted by the calibrator, press the Enter key or the Select soft key
to start polling HART devices.
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