COMMISSIONING
148 Service Manual Part No.: 4417340 Revision 1
954 SmartServo FlexLine
HART Analog Outputs (HCI-HAO)
7.3.9.1 Introduction
The Host Communication Interface – HART Analog Output (HCI-HAO)
is a HART® slave module which communicates with the associated
HART master over the HART bus.
Figure 7-25
The HCI-HAO board
The HART protocol is a bi-directional master-slave communication
protocol, which is used to communicate between intelligent field
instruments and host systems.
The HCI-HAO board has a planar transformer for galvanic isolation from
the HART bus. See Figure 7-25.
LED LE1 is the board’s [Health] LED. LEDs LE2 and LE3 will be flashing
to indicate activity on the HART bus. LE2 indicates data is being
transmitted (Tx), LE3 indicates data is being received (Rx).
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