Presys PCA-570-RM Technical Manual page 51

47
b) HART ONLY (Calibrator in parallel with transmitter)
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Fig. 33 - HART only
IMPORTANT: Before connecting the calibrator to the transmitter(s) as shown above, make sure that the mA
input is not configured on the PCA-570 (Enter the Calibrator menu and select any non-mA input or select
none)
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For the connection shown in Figure 33, use the HART ONLY option. In this mode, the internal resistor and
resistor of at least 250 Ω must be inserted externally in series with the power
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the mA input are disabled. The HART
supply and the transmitter. In this case, the calibrator doesn't perform the current measurement of the transmitter, but
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can read and configure its parameters via HART .