Chapter 2. Operation
28
HygroPro
II
User's Manual
2.3.4 Configuring HART Options
As described in Chapter 1 the HygroPro
II
is compatible with the HART® 7.0 protocol and supports both point-to-point
and multi-drop digital communication by superimposing low-level digital signals on top of the 4–20 mA analog
output. This enables 2-way field communication between one or more HART masters the HygroPro
II
wherein
additional diagnostic information beyond the normal process variable can be communicated.
In order to configure HART settings, choose the HART
option on the Main Menu and press Enter to access
the HART screen.
Use the Up and Down arrow keys to select
Enable/Disable HART and press Enter. The next
screen shown on the left enables you to either
disable (default is enabled) or enable HART on the
4 – 20 mA output. Press Enter.
In a multi-drop configuration, each HART slave
(HygroPro11 unit) has a unique polling address. This
can be set by the Polling address option.
Pressing Enter will enable you to change this
address (default = 0) between 0 and 20. Press Enter
to save your selection.
Even when HART is enabled, the 4 – 20 mA continues
to work as a standard analog output that can be
configured as described in Section 2.2.4 above.
To change the Loop Signaling configuration choose
it and press Enter. This brings you to the next screen
that lets you choose between Enable (default) and
Disable. If the latter is chosen, you can set the fixed
mA value for the analog output on the next screen.
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