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709/709H/710
Users Manual
22
250Ω Resistor
The 250Ω Resistor function lets you turn the 250 Ω resistor on or
off. Use the selection knob to change the resistor to the highlighted
selection and return to the Setup and Selection screen. See
Figure 25.
Figure 25. 250Ω Resistor Screen
HART Connect
The HART Connect function locates the HART device in the loop.
Before an operation with a HART device, the device must be
located on the loop. This is done by polling all of the possible
device addresses and selecting a device from those addresses
that respond to the search.
If a HART protocol revision 5 or earlier device is found on the loop,
polling stops at poll address 15. If not found, the Product continues
to poll address 63. Polling stops after 10 devices are found on the
loop.
If multiple devices are found on the loop, a tag list shows. From the
list, select the correct device. If only one device is found on the
loop, it becomes the selected device by default.
When a selected device is found, all relevant data is read from the
device and the operations described in the Function Select Menu
and Device Setup and Data sections of this manual become
available.
Polling Loop
The Polling Loop function searches the loop for HART devices.
This function starts immediately. The screen changes to show the
string of dots that is extended once per second to as the operation
progresses. See Figure 26.
Figure 26. Polling Screen
The number of devices found on the loop during polling shows.
The selection knob can be pushed to stop polling early if it is
known that all of the devices on the loop have been found. Push
to stop polling, disconnect from HART mode, and go to the
function home screen.
An error shows if no device is found.
If multiple devices are found, a list of tags shows. Use the list of
tags to select the device.
If only one device is found, the tag selection step is skipped.
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