4.2 Weigand Device Data
The weigand device (card reader, RF receiver, digital, etc.) must output data in the 26-bit weigand
format. The tracker board is not capable of receiving any other weigand format from these devices.
The weigand device must be connected to terminal P2, pins 6-7-8-9 as described in section 4.4 of
this manual.
Two weigand devices may be connected in parallel to the weigand input on the tracker board. Be
aware that both devices will appear to the access system and the Remote Account Manager software
as the same device.
Power for the weigand devices is provided on terminal P2, pins 8 (common) and 9 (+10 to +12 VDC).
To check this power:
1. Set your VOM to the 50-volt DC range.
2. Connect the positive lead (red) to pin 9 and the negative lead (black) to pin 8. The
meter should indicate +10 to +12 volts DC.
The tracker board weigands out data on terminal P1 pins 7-8-9. When the tracker board is sending
data to the access system on these lines, the LED near these terminals will light. The voltage to
operate these terminals comes from the access system. Normal voltage on these terminals is +4.5 to
+5 volts DC. To check this voltage:
1. Set your VOM to the 50-volt DC range.
2. Connect the negative (black) lead to pin 7 and then check pins 8 and 9 with the
positive (red) lead. The meter should indicate +4.5 to +5 volts DC.
The data from the weigand devices is inputted to the tracker board on terminal P2, pins 6 and 7. The
normal voltage for these pins is +4.5 to + 5 volts DC. This can be checked by connecting the negative
(black) lead of your meter to pin 8 and then checking for voltage with the positive (red) lead on pins 6
and 7.
When a weigand device sends data to the tracker board on terminal P2, pins 6 and 7, the LED's
associated with these terminals will flash. These flashes are very fast and may be difficult to see. If a
26-bit weigand input is received, the tracker board makes the lines on terminal P2, pins 2 and 4 busy
to prevent the gate operators from sending any transactions. It then checks for a busy signal on
terminal P2, pin 10. If this pin is not busy, the tracker board will make this pin busy itself and then
weigand out the data to the access system (If P2, pin 10 is busy, the tracker board simply waits for
this pin to go un-busy and then sends the data). After the tracker board sends the data, it will wait for
a reply from the access system (The weigand out LED will flash when the data is sent to the access
system). Once the data is received by the access system, the access system will make the decision
to grant or deny access. If the decision is to deny access, the tracker board will release the busy
signal on terminal P2 pin 10, and will not activate it's output relay. If the decision is to grant access,
the access system will activate its relay, which causes the tracker board to activate its output relay,
and then releases the busy signal on terminal P2 pin 10 allowing other tracker boards to
communicate with the access system.
The above operating sequence takes place in less than one second. In applications where the system
is operating at its maximum (16 devices), and in the unlikely event that all devices are activated at
precisely the same moment in time, there could be a delay of a few seconds for the last tracker board
to activate its output relay if the access system decides to grant access to the person using the
device connected to this tracker board.
Page 36 2351-065-G-12-07
To Next Page
Loading...