Data interfaces
37
Siemens Building Technologies
Fire Safety & Security Products 07.2008
Card-determined variable length Wiegand data output (interface number 8E)
If the Reader is set to interface number 8E, the length of Wiegand data it outputs
when it reads a card is determined by the number programmed into bits 41 to 48 of
that card. Bits 41 to 48 are the shaded area shown in the diagram below:
Interface 8E can output any number of bits of “card number” from 1 to 40. Bits 41
to 48 which determine the length of data output are actually the most significant
byte of the secondary code, and you need to remember this when you program a
card. It is best to use the 633-2 Programmer in either HEX/HEX or HEX/DEC
mode, so you enter the secondary code in hexadecimal. The first two hexadecimal
digits of the secondary code will be the data output length, and the last two hexa-
decimal digits of the secondary code will be bits 33 to 40 of the card number.
For example, if you want to output 24 bits of data: 24 decimal is 18 hex.
z You program the card number in the normal way, and you program the secon-
dary code to be 1800 in HEX/HEX or HEX/DEC mode on the 633-2 Program-
mer.
As another example, if you want to output 40 bits of data: 40 decimal is 28 hex.
z You program the least significant 32 bits of card number into the card number
field on the 633-2 Programmer.
z You program the secondary code to be 28xx where xx is the most significant
byte of the card number.
Interface 8E outputs the specified number of data bits, most significant bit first,
100µs pulse, 400µs space, 2s RDD.
(If you program bits 41 to 48 of the card to be zero, or any number greater than 40,
interface 8E outputs 40 bits of card number.)
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