©Yokogawa Corporation of America
2 Dart Road, Newnan, GA 30265
770-254-0400
IM 61A YHC1-E-A
1st Edition: Feb. 2008
Page 10 of 34
NOTE: When replacing the AA batteries, the date and time will remain active. Date & time information is
continuously powered by an internal, 10-year life back-up battery. This battery is not serviceable by the
user.
Backlight
(off timer)
To conserve battery life, the YHC allows the user to set the backlight to shut off after a certain period of
keypad inactivity. To change the backlight off timer on the unit, scroll
Down
to
Backlight
and press
Chng
repeatedly until the desired value is displayed.
The shutoff timer can be disabled or set to shut off after time periods of from 1 minute up to 30 minutes.
NOTE: The Backlight Off Timer is disabled when the optional AC Adapter (P/N Z9B000007) is powering the
YHC.
Off Timer
(master)
To conserve battery life, the YHC allows the user to set the unit to shut off after a certain period of keypad
inactivity. To change the off timer on the unit, scroll
Down
to
Off Timer
and press
Chng
repeatedly until
the desired value is displayed.
The shutoff timer can be disabled or set to shut off after time periods of from 1 minute up to 2 hours.
NOTE: The Off Timer is disabled when the optional AC Adapter (P/N Z9B000007) is powering the YHC.
5 Other
Model information and special settings are available from this menu item. Press number key “5” or arrow
to this menu line and press
Chng
to select. This reveals menu options for the following:
1 Model Info
– select to view model number, serial number, firmware revision, last update date,
number of DOFs loaded with corresponding free memory space, and number of HART
configurations saved with corresponding free memory space.
2 Battery
– shows present battery setting and optimizes the battery life indicator for the battery type
entered. Press number key “2” to scroll through Alkaline (factory default) and NiMH battery
options or arrow down to this menu item and press
Chng
soft key repeatedly until the desired
value is displayed.
3 HART
– shows present HART
®
communication setting. The YHC is a HART
®
secondary master.
“Compatible” setting means the handheld will inform the user if another secondary master is on
line. Such situations will require the removal of the other secondary master before HART
communication can occur. “Fast” setting results in faster communications but will cause
interference if a HART
®
primary master is on line (example: a HART
®
Multiplexer or I/O). In
normal operation the YHC automatically selects the best setting.
4 Enter PC Comm. Mode
- When the YHC is connected to a PC for updates via DPC Manager (see
DPC Manager Utility section in this manual), a DB-9 serial cable is used. Occasionally a DB-9
Serial cable is encountered that does not have a DTR line. The DTR line is important to the
update process because it is used to initiate and confirm communication between the two
machines. If a DB-9 cable without a DTR line is used, the YHC must be manually placed in the
Enter PC Comm. Mode
. Go to the YHC Main display and select
Cfg
. Select menu option
5
Other
. Select the
Enter PC Comm. Mode
. Proceed with update and cycle YHC power when the
update is complete. It is recommended to use fresh batteries or an AC adaptor during update
procedures. This mode will automatically time-out after approx. 1 minute of inactivity and return
to the main display.
