
Model 4821/4820 Control/Communicator Installation Manual
6-10 150966
6.2.2.10 9-Delete Options
Note: This option is available only in Safe Mode.
Safe mode is a mode of system operation that enables you to bypass a problem at the panel
and reset the options to their default values. It is useful when a condition exists at the panel
that is preventing you from operating your system or communicating with the downloading
software. Activating safe mode does not affect the program options in memory. It simply puts
the panel in a state during which you can reset the program options with the downloading soft-
ware.
The Delete Options feature in touchpad programming is only used when attempts to download
the system have failed to restore operation. In this case, first delete the current options through
touchpad programming. From the main menu, press
.
The system asks for confirmation,
and then proceeds to erase all options from the system. After erasing the options, you must
restore program options to the system by using the downloading software.
Activating Safe Mode
SBUS devices can be left connected to the system. At least one touchpad is required.
1. Remove power from the system.
2. Connect a jumper wire from SBUS terminal A1 to SBUS terminal A2.
3. Connect a jumper wire from SBUS terminal B1 to SBUS terminal B2.
4. Apply power to the system.
The touchpad will display Safe Mode Active, Code is 1234, and then SBUS 1
shorted to SBUS 2. These messages remain active until the system is reset without the
SBUS jumpers.
While in Safe Mode, the system can be triggered to start a download by pressing
on any touchpad.
Note: Safe Mode will make the baud rate of the PI/Comm device 9600.
Quitting Safe Mode
1. Remove power from the system.
2. Remove the jumpers from the SBUS terminals.
3. Reapply power to the system.
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