©Yokogawa Corporation of America
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IM 61A YHC1-E-A
1st Edition: Feb. 2008
Page 11 of 34
5 Polling Type
– Two user selectable options are available.
Auto
polling directs the YHC to always poll for HART device address 0 (zero) first. When found,
communications begin automatically. If address 0 is not found, the YHC automatically asks for
direction; select
Multi
soft key to start a multi-drop poll from address 1 – 15 or select
Retry
soft
key to try to find address 0 again (for more details see the HART Communications section)
Digital
polling directs the YHC to always poll for HART device addresses 0 – 15. This polling
method is best for 4 – 20 mA loops where one device with address 0 is present and another device
with a non-zero address is on the same loop.
