fortessa 3068-F, Hardware Manual, Page: 18 / 24

14
End of Line Resistor
The End of Line resistor should be set to Y on the jumper setting (see figure 11).
Cables
Two core twisted pair cable is to be used to wire the FORTESSA Network (a screened
cable can be used to offer better protection). FORTESSA Controllers can be further
linked together in a “daisy chain”, to a maximum of 16 on the whole network, by wiring
A to A and B to B using the Network terminal blocks of the FORTESSA Controllers.
If the optional screened cable is used then the incoming and outgoing screen can be
fitted to SCR on the Network terminal block. It is important to remember that the
screen needs to be earthed to ground at one end of the network.
A screened cable has advantages over a standard twisted pair cable. Whilst not a
complete guarantee, a correctly fitted screened cable will help protect against induction
from fluorescent lighting, power surges or lightening strikes by safely discharging the
current to earth instead of the circuit board which could lead to damage.
Desktop Reader
The USB Interface can also support a connection to a FORTESSA Desktop Reader
which is connected via the Reader terminal block. The positive and negative terminals
from the FORTESSA Desktop Reader should be wired to the positive and negative
connections on the USB Interface Reader terminal block and the X and Y data
connections from the FORTESSA Desktop Reader should be wired to the USB
Interface Reader terminal block by linking X to X and Y to Y.
Figure 7 below shows the layout of the USB Interface including the network
connections and desktop reader ancillary.
LED Indicators
The Reader LEDs
The LEDs inform on the status of the optional FORTESSA Desktop Reader. A red
LED indicates that there is a short circuit and a green LED indicates that there is data
from the desktop reader.
The USB LEDs
TX (red) and RX (green), advise on whether the PC is transmitting to the USB Interface
(TX) or receiving information from the USB Interface (RX).
The FORTESSA Network LEDs
The green Poll LED signifies that the USB Interface is receiving data from the PC and
the red Data LED signifies that there is data on the FORTESSA network.