Lakeshore Learning Materials 642 - Manual (Page 50)

Lake Shore Model 642 Electromagnet Power Supply User’s Manual
4-10 Operation
Locking the Keypad (Continued)
To lock or unlock the instrument keypad press and hold the Enter key for 5 seconds. The following setup screen appears
as a prompt for the keypad lock mode.
Keypad Lock
Select With °®
Keypad Lock: Unlock
Use the s or t key to select the keypad lock mode, Unlock, Lock All, or Lock Limits. Press Enter to choose the new
selection and continue to the keypad lock code verification. The change to the keypad lock mode is not made until the
correct keypad lock code has been entered. Press Escape to cancel the new selection and return to the normal display.
Once the keypad lock mode has been selected, the keypad lock code must be entered to accept the change. The following
screen appears as a prompt for the keypad lock code.
Keypad Lock
Enter A Value For
Keypad Lock Code:
Use the data entry keys to enter the 3-digit lock code (default 123). An asterisk will appear on the display for each
number entered. If the code entered matches the lock code, the display will show “Change Accepted” and the
keypad lock mode will be updated. If the code entered does not match the lock code, the display will show
“Invalid Lock Code” and the keypad lock mode will not change.
4.17 COMPUTER INTERFACE
There are two computer interfaces on the Model 642, a serial RS-232C interface and an IEEE-488 interface. These
interfaces are used to connect the instrument to a computer for automated control or data taking. Refer to Chapter 5.
4.17.1 Changing Serial Baud Rate
To select the Serial Interface Baud Rate press the Computer Interface key. The first computer interface screen appears
as a prompt for Baud.
Computer Interface
Select With °®
Baud: 9600
Use the s or t key to select 9600, 19200, 38400, or 57600 Baud. Default is 9600 Baud. Press Enter to accept the new
selection and continue to the next screen. Press Escape to cancel the new selection and return to the normal display.