VESDA by Xtralis
VESDA VLP Product Guide
www.xtralis.com
25
6
Wiring Connections
6.1
Termination Card
The termination card acts as the interface for VESDAnet, power supply, relays and the General Purpose Input
(GPI).
Legend
A
VESDAnet Terminals
B
Power Terminals
C
Relay Terminals
D
GPI Terminals
E
VESDAnet Socket
F
FOK LED Connectors
Figure 6-1: Termination card illustrating relays and termination points
6.1.1
VESDAnet Terminals
VESDAnet is a bidirectional data communication network between connected VESDA devices. VESDAnet
cables are terminated at the VESDAnet A and B Terminals on the termination card. Communication wires
from another VESDA device are brought into the detector at one terminal and looped out to another device on
VESDAnet from the other terminal. It is necessary to maintain the polarity throughout the network. It is
recommended that RS 485 (Belden 9841 - 120 Ohm) twisted pair cables, or similar cables be used.
The VESDA VLP detector is shipped with the VESDAnet A and B terminals looped. If the detector is not to be
networked with other devices, then do not disturb this loop. Remove this loop to connect the detector to the
VESDAnet.
Shield
A-
A+
Shield
B-
B+
Figure 6-2: Stand-alone VESDAnet connection