Table des Matières
Publicité
Les langues disponibles
Les langues disponibles
Frame make up for the WIEGAND signals
The frame in the WIEGAND format is emitted by means of the DATA0 and DATA1 signals. The dura-
tion of each single bit is 50μs while the waiting period between one bit and the next is 2 ms.
Parity B4 B3 B2 B1 Character
1
0
0
0
0
0
0
0
0
1
0
0
0
1
0
1
0
0
1
1
0
0
1
0
0
1
0
1
0
1
1
0
1
1
0
0
0
1
1
1
0
1
0
0
0
1
1
0
0
1
0
1
0
1
1
0
1
1
0
1
0
1
1
1
1
Frame construction example limited to six characters; transmitting the code "452"
MEANING
BIT
Start
1 0 1 1
"4"
0 1 0 0
"5"
0 1 0 1
"2"
0 0 1 1
End
1 1 1 1
LRC
0 1 1 1
Frame composition diagrams for ISO2 signals
There are three ISO2 signals: CLS (Card Loading Signal), RCP (Read Clock Pulse) and RDP (Read
Data Pulse). The 3 signals are active low.
First of all the CLS drops and after 5 ms 10 clock pulse are sent; the data packet is then sent and
then their is a pause of 5ms before pulling up the CLS.
1
DATA 1
DATA 0
ISO2 PROTOCOL (BIT FLOW SEQUENCE)
The frame leaving the interface is formed of 16 characters. Each
0
character is made up of 5 bits according to the table on the left,
1
where the most significant bit is B4, and the least significant is
2
B1.
3
4
The parity bit is odd parity for B4, B3, B2, B1.
5
6
7
The frame is as follows: START + CHANNEL (1 character) + SEP
8
+ CODE (10 characters) + SEP + END + LRC, i.e. 16 characters
9
altogether.
START
SEP
END
PARITY
0
At the end of the frame an LRC control character is sent which
0
is calculated by working out the even parity longitudinally along
1
the corresponding bits as shown in the table on the left.
0
The first bit out is B1 and the last one out is the parity bit.
1
0
CLS
RCP
RDP
5ms
0
2mS
5ms
23
1
Publicité
Table des Matières
