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Polling Menu
Use the Polling options to configure your HART Communicator to
automatically search for all or specific connected devices. The HART
protocol allows you to communicate with multiple HART devices on a single
twisted pair of wires over leased telephone lines.
When several devices are connected in the same loop (multidropped), each
device must be assigned a unique address. To find the individual device
addresses, use the Digital Poll option to find each connected device in the
loop and list them by tag number.
Communication between the Communicator and multidropped transmitters is
digital, with the analog output fixed. In a multidrop installation, each
transmitter is identified by a unique polling address of 0 or 1–15 and
responds to the commands defined in the HART protocol.
Use the up and down arrow keys to highlight the desired polling option:
Press (F4) to enter the highlighted option and return to the Configure
Communicator menu. Or, press (F3) to return to the Configure
Communicator menu without changing the Polling.
From the Configure Communicator menu (Figure 1-25), press to
access the Polling menu (Figure 1-26).
FIGURE 1-26. Polling Menu.
The Polling options are:
Never Poll connects to a device at address 0, and if not found, will not poll
for devices at address 1–15.
Ask Before Polling connects to a device at address 0, and if not found, asks
if you want to poll for devices at address 1–15.
Always Poll connects to a device at address 0, and if not found, will
automatically poll for devices at address 1–15.
Digital Poll automatically polls for devices at address 1–15, regardless.
Poll Using Tag asks the user for a tag to use to connect to a device.
Refer to your device-specific manual for more information on changing a
device polling address.
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