Matrix Orbital LK162-12 Legacy - Manual (Page 8)

LK162-12 rev 4 8
1.7 Manual Override
Manual override should only be required in one instance. If for some reason the module is set at a baud rate
which cannot be produced by the host system and all communication to the display is lost, then the user
should follow this simple procedure:
1. Turn off the display
2. Put a jumper on pins 3 and 4 of the keypad connector (R3 and C1).
3. Power up the display. The baud rate is now set to 19,200.
4. Remove the jumper and change the RS-232 port settings to the desired baud rate.
5. Turn off the display.
6. Power up the display.
Refer to the “Set RS-232 Port Speed” command (section 6.1.14) for acceptable baud rates.
Place jumper on the above pins
1.8 Memory Chip Lock Down
The LK162-12 uses a memory chip to store speed, startup screen contrast, I²C setting and other settings.
When everything has been changed to the wanted settings and the unit will be in a finished product or in
the field, locking down the memory chip so no settings can be changed might be desirable. This is only to
be done by knowledgeable people. Any damage to the display by this procedure resulting from user error
will no be covered under warrantee.