©Yokogawa Corporation of America
2 Dart Road, Newnan, GA 30265
770-254-0400
IM 61A YHC1-E-A
1st Edition: Feb. 2008
Page 3 of 34
with zero address is found, the YHC immediately goes into online status and displays information
about the device. If no device is found, the YHC enters the YHC Main navigation screen. To turn the
YHC off, press and hold the ON/OFF key for approximately .5 seconds. Unit will power down
provided a critical HART operation is not in process.
Quick Menu
The Quick Menu key initiates HART communications and then displays ten (10) HART menu
choices for the connected device. These menus are used to short cut the traditional HART menus to
enable the user to arrive quickly at desired functions. Typical Quick Menu options include: Main
Menu, Config Menu, Rerange, Basic Info, Construction Materials, Display, Sensors, Signal
Conditioning, Self Test. Quick Menu is disabled while critical HART operations are in process.
(Home)
The key sequence
,
returns the user to the initial or “home” HART menu for the connected
device. The Home function is disabled while critical HART operations are in process.
Document
This key provides rapid access to HART communication Save/Send Configs options, List/Edit
Configs, and Create Configs functions for all YHC models. For Documenting operations this key also
provides documenting functions used with the Yokogawa Device Management System software.
Access to this key is disabled while critical HART communications are in process.
Display Contrast
This key allows the user to adjust the contrast of the LCD display for ambient lighting and user
preferences at any time and in any operating mode. Pressing and holding this key cycles through all
available contrast settings. After adjusting Display Contrast, wait at least five (5) seconds before
turning unit off to insure storage of new contrast setting. Ambient temperature compensation is
included in the YHC.
Backlight
This key toggles the backlight feature between Off / Low intensity / High intensity to illuminate the
display for ambient light conditions. Battery life is impacted by use of the backlight feature; High
intensity is the most aggressive. An automatic shut-off timer is available by pressing the
Cfg
soft key
from the main menu.
Alphanumeric / Symbol Entry
The alphanumeric keys have the heaviest population on the keyboard and are the method of entering
data into the YHC. Each YHC display has a default alpha or numeric / symbol entry mode based on
the most likely used mode for the display’s function. Pressing the ALPHA LOCK ( ) key
activates the other entry mode for alphanumeric keys. Pressing the SHIFT key ( ) converts the next
key stroke to the inactive entry mode and then automatically reverts back to the active mode. The
letter “A” in the display header line indicates the alpha input is active while a # sign in the display
header indicates the numeric / symbol input is active.
(Shift)
The key is used to activate the secondary functions of the YHC’s dual function keys for the next
keystroke only. When the Shift key is active, an up arrow
is displayed at the top of the display to
the left of the battery power (or AC wall plug) symbol is also used to activate the Page Up and
Page Down soft key functions while viewing lists of information (installed DOFs, stored configs,
etc…).
#
2
B
L
A
