Velleman projects K6400 Assembly instructions - Manual (Page 5)

5
Construction
Assembly of the keyboard module : P6400S
The four code digits are determined by fitting wire jumpers, see figure 1.0.
Drawing 2 shows the connections for code 1234 as an example.
Attention : the wire jumpers that build the code must be as close
to the pcb as possible, because otherwise they will touch the
aluminium front panel!
The code sequence is determined by connecting the lines A,
respectively B, C and D to the connecting terminals (keys 1 through 9)
at the inside of the pcb, where line A is the first code, B the second
code and so on. The unused keys (normally 5) are connected to line N.
3. Determining the code
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
SW9
LD1
2. Led’s. Watch the polarity!
LD1
CATHODE
CODE 1234
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
SW9 SW9
SW8
SW7
SW6
SW5
SW4
SW3
SW2
SW1
P6400S
N A B D C CD B A N
P6400S
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
SW9 SW9
SW8
SW7
SW6
SW5
SW4
SW3
SW2
SW1
Fig. 2 Fig. 1
1. Push button