MorphoAccess® SIGMA Series - Administrator Guide
Access Control by Authentication
2017_2000025464-v03
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394
July 17
Example: 32 bits user’s identifier within a 37-bits Wiegand frame
The user’s card contains, at the first block of sector 15 a full 37 bits Wiegand frame (which
includes start and stop bits, the site code of the sender, and user’s identifier). The first block in
sector 15 is block 46.
Figure 334:
Using a Wiegand frame as User ID
The 32 bits identifier begins at bit four. It is located after the start bit (bit0) and the site code
(bit1-2-3), and is followed by the end of frame bit.
Acquisition of a 32 bits user’s identifier inside a 37 bits Wiegand frame.
sc_binary_read.data_format = 1
Binary format
sc_binary_read.data_type_direction = 0.1
Binary identifier, MSB format
sc_binary_read.data_length_num_bytes = 4.0 Size = 4 bytes
sc_binary_read.data_offset_num_bytes = 0.4 User’s identifier begins at bit 4 of the first byte
of the block specified below
sc_tlv_mifare.start_block = 46
Read from first block of sector 15 (i.e. block 46)
When the user’s identifier must be sent to a distant system using Wiegand protocol, it is possible
to configure the terminal to automatically add the start and stop bits to the Wiegand output
frame.