Meinberg DCF77, Operating Instructions Manual

Page: 15 / 18

15
Firmware updates
Whenever the on-board software must be upgraded or modified, the new firmware
can be downloaded to the internal flash memory via the radio clock's serial port
COM0. There is no need to open the computer case and insert a new EPROM.
If the button behind a hole in the rear slot cover is pressed twice, a bootstrap loader
is activated and waits for instructions from the serial port COM0. A loader program
shipped together with the file containing the image of the new firmware sends the
new firmware from one of the computer's serial ports to the clock's serial port COM0.
The bootstrap loader does not depend on the contents of the flash memory, so if the
update procedure is interrupted, it can easily be repeated.
The contents of the program memory will not be modified until the loader program
has sent the command to erase the flash memory. So if the button has been pressed
accidentally, the system will be ready to operate again after the computer has been
turned off an the on again.
Replacing the lithium battery
The life time of the lithium battery on the board is at least 10 years. If the need arises
to replace the battery, the following should be noted:
ATTENTION!
Danger of explosion in case of inadequate replacement of
the lithium battery. Only identical batteries or batteries
recommended by the manufacturer must be used for re-
placement. The waste battery must be disposed as propo-
sed by the manufacturer of the battery.
CE label