11.5 Query checksum
PU1
SW2
SW1
KEY 2
LD1
LD2
LD3
LD4
LD5
LD6
LD7
LD8
LD9
KEY 8KEY 9KEY 10KEY 11KEY 12
KEY 1
KEY14
KEY15
KEY16
KEY13
Fig. 45 Indication of checksum
In order to find out, whether the user functions have been changed since the last
service engineer visit, set the system to programming mode (see chapter 11.1).
1. Press keys "Digits 2 and 3" simultaneously.
LED11 "Disabled" and LED20 "Horn/Actuator" flash (slow) (this indicates the
current checksum).
2. Note which of LEDs 12 to 19 light up within 10 seconds and write these down.
3. Compare the now active LEDs with the previous state.
Any change of user functions will also result in a change in the lit LEDs.
4. Exit program mode (see "Exiting program mode" at the beginning of the
chapter).
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