IM 61A YHC1-E-A
3rd Edition: May 2008
Page 2 of 34
Photo below depicts the YHC with initial
HART display and Soft keys:
On/Off
Pressing the ON/OFF key powers up or turns off the YHC. As the unit powers up, an internal
diagnostic check is performed. Any abnormalities are posted on the display. The unit will briefly
display the YHC model number and then check for a HART device with address of zero. If a device
KEY PAD OVERVIEW
The YHC keypad has three basic key types: single
function keys, dual-function keys, and soft keys
with changing definitions.
Single function keys control a dedicated YHC
function.
Dual function keys, through the use of the Alpha
Lock ( ) or Shift ( ) keys, toggle between
two separate functions as needed to facilitate data
entry.
Soft key functions change depending on the
operating mode. Soft key definitions are
displayed at the bottom of the LCD, just above
their respective gray soft keys.
The left hand thumb keys can be used to scroll
up, scroll down, and to select menu items.
HEADER LINE SYMBOLS
heart symbol indicates active HART
communication
u
up arrow indicates SHIFT key ( ) is on
# number sign indicates numeric / symbol entry
is the active entry mode for all dual functions
keys
A the letter “A” indicates alpha entry is the active
entry mode for all dual function keys
battery symbol indicates YHC under battery
power; filled portion indicates remaining
battery
electrical plug symbol indicates the AC adapter
is connected and powering the YHC
BUSY text box replaces either power symbol
when the microprocessor is busy executing a
previously requested task. Do not press keys
when this status symbol is displayed.
BUSY
A
