Operation
3.10 LOCKING AND UNLOCKING THE KEYPAD
The keypad lock feature prevents accidental changes to parameter values.
When the keypad is locked, only the alarm reset function of the Select key
still functions. All other key functions are ignored.
To lock the keypad, press and hold the Enter key for 10 seconds. The
display will show ―L0[‖ indicating the keypad is now locked. Release the
Enter key and the display will return to normal operation.
To unlock the keypad, press and hold the Enter key for 10 seconds. The
display will show ―UnL0[‖ indicating the keypad is now unlocked. Release
the Enter key and the display will return to normal operation.
3.11 RESETTING THE MODEL 211 TO DEFAULT VALUES
It is sometimes necessary to reset instrument parameters that are stored in
nonvolatile memory called EEPROM. The default values of the Model 211
are shown below in Table 3-6. Resetting to default values does not affect
the user curve or the calibration data.
To reset the Model 211 to default values, press and hold both the s or t
keys for 10 seconds. All of the LED digits will illuminate when the memory
has been reset. Release the buttons and the display will return to normal
operation.
Table 3-6. Model 211 Default Values
3.12 CHECKING CODE DATE REVISION
To check revision date of the firmware code, press and hold the Select key
until the display shows the code date. It is in the format of MMDDYY,
where MM is the month, DD is the day, and YY is the year of the code.
Release the key and the display returns to normal operation.
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