Cardin Elettronica RCQ486W00, Manual, Page: 27 / 56

27
If you choose the
WIEGAND
protocol 1,2,3,6,7 and 9 (pages 22…24) it is possible that the
S486
transmitter code exceeds the maximum code length that can be represented by the
available bits. With jumper " J1 " not inserted, no WIEGAND output will occur, code informa-
tion on the RS232 line will however be available.
Inserting jumper "
J1
" activates the "
code truncation
" function which eliminates the most
significant bits which cannot be represented by the chosen
WIEGAND
format.
E.g. 1 :
If you choose the 26 bit WIEGAND protocol with site code (limit 65’535 ) and the transmitter
code is 356’890 , the truncation function will cancel the first bit and the code effectively sent
in WIEGAND output will now be 56’980 (A number less than 65’535 ).
E.g. 2
:
If you choose the 37 bit BCD
WIEGAND
protocol with site code (limit
542’287
) and the
transmitter code is
18’436’500
, the truncation function will return the code
436’500
.
Attention! Activating the "truncation function" (jumper " J1 " inserted) it is possible
that two transmitters (even though they have different codes) send an identical
sequence of bits to the interface output.
For example in the case of the
WIEGAND
26 bit protocol with site code the codes
138’612 and 238’612 will activate the same bit sequence in output, 38’612 .
CODE TRUNCATION