IM 61A YHC1-E-A
3rd Edition: May 2008
Page 16 of 34
When connecting the YHC to a loop with a resistive load greater than 250
Ω
s, the HART jacks may be
connected across the loop + and – or to the HART device communication terminals. Refer to the following
diagram for connecting across the loop + and -.
HART
®
Communications
Initial Screens / Online Mode
Upon power up the YHC automatically detects if a field device is connected and attempts to establish HART
communications; this is the factory default “
Auto
” poll function. When a device with address zero is found,
the YHC provides feedback to the user and starts the initial HART display for the connected device. See an
example of Online Mode below.
Connecting to the YHC communication terminals
Online
#
EJX : PT-1012D
1 Device setup
2 Pres: 0.01 inH2O
3 AO: 4.001 mA
4 LRV: 0.00 inH2O
5 URV: 250.00 inH2O
Up Down Select Back
Initial HART Screen / Online Mode
Communicator
#
1
Online Setup
2
Offline Menu
Device 0: *On-Line*
Yokogawa
EJX
Fld Dev Rev 01
Dof Name 37510103
Up Down Select Cfg
YHC Main Navigation Screen
Auto Poll Launch: Device “0” found
