Lake Shore Model 218 Temperature Monitor User’s Manual
4-16
Operation
4.12 LOCKING THE KEYPAD
The Model 218 keypad lock feature prevents accidental changes to parameter values. When the keypad is
locked, some parameter values may be viewed, but most cannot be changed over the front panel. Alarm
Reset is the only keypad function that remains active when the keypad is locked.
A three digit keypad lock code locks and unlocks the keypad. The factory default code is
123
. The code can
be changed only through the computer interface. If instrument parameters are reset to default values, the lock
code resets also. The instrument cannot reset from the front panel with the keypad locked.
To lock the keypad press and hold
Enter
for 10 seconds to
display the screen to the right.
Use the number keys to enter the 3-digit lock code. The
keypad locks and the normal display appears. Changes
attempted to any of the Model 218 parameters result in a brief
display of the *LOCKED* message.
To unlock the keypad press and hold
Enter
for 10 seconds to
display the screen to the right.
Use the number keys to enter the 3-digit lock code. The
keypad unlocks and the normal display appears. All Model
218 parameters are now accessible.
4.13 RESETTING MODEL 218 TO DEFAULTS
To reset the Model 218 to defaults, press and hold
Escape
until the screen to the right appears.
Use the Data Selection keys to select Yes or No to reset the
NOVRAM, then press
Enter
. Select Yes to reset all Model
218 parameters to the defaults listed in Table 4-4 below. The
second screen in the setting sequence displays.
Use the Data Selection keys to select Yes or No to clear all
user curves stored in the Model 218. Standard curves are
unaffected. Press
Enter
. The instrument performs the
operations specified then displays the Normal display.
Table 4-4. Model 218 Parameter Defaults
Parameter Default
Parameter Default
Input Type
2.5V Diode
Max/Min Units
K
Input Curve
DT-470
Linear Units
K
Analog Out
Off
Local/Remote
Local
Relays Off
Address
12
Printer Off
Terminators CR/LF
Log Mode
Off
Baud
9600
Filter Off
Keypad Not
Locked
Alarms Off
Lock
Code
123
Audible Alarm
Off
Display
Locations 1-8 = Inputs 1-8
Source = K.
