Fluke 710 Product Manual - Page 27

Shop for Fluke products online at: www. 709/709H/710 Users Manual 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. 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. MyFlukeStore.com 1.888.610.7664 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. 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. 22