Lakeshore 325 - Interface

Lake Shore Model 325 Temperature Controller User’s Manual
Operation 4-25
4.15 LOCKING AND UNLOCKING THE KEYPAD
The 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 from the front panel. Heater Off is the only keypad function that
remains active when the keypad is locked.
A 3-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 the Enter key for 10 seconds to display the screen shown as follows.
Enter Code To
Lock Keypad
Use the numeric keypad to enter the 3-digit lock code. The keypad locks and the normal display appears. Changes
attempted to any parameters result in a brief display of the *LOCKED* message.
To unlock the keypad, press and hold the Enter key for 10 seconds to display the screen shown as follows.
Enter Code To
Unlock Keypad
Use the numeric keypad to enter the 3-digit lock code. The keypad unlocks and the normal display again appears. All
Model 325 parameters are now accessible.
4.16 REMOTE/LOCAL
“Local” refers to operating the Model 325 from the front panel. “Remote” refers to operating the controller via the
IEEE-488 Interface. The keypad is disabled during remote operation. The mode of operation can be changed by pressing
the Remote/Local key. When in remote mode an “R” will be displayed in the rightmost character on the top line of the
OLED display. When in local mode, the character will be blank.
4.17 INTERFACE
The Interface key serves two functions: set the serial interface baud rate, and set the IEEE-488 interface address and
terminators.
To set the serial interface baud rate, press the Interface key.
Select With °®
Baud 9600
Use the s or t key to cycle through the choices of 9600, 19200, 38400, 57600 baud. The default baud rate is 9600.
Press the Enter key to accept the changes or the Escape key to keep the existing setting and return to the normal display.