LaserSCANNER Product Manual
VESDA
®
26
Figure 17 - Optional 12 relays terminal card illustrating relays and termination
points
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 LaserSCANNER 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.
A
B
C
D
E
F
G
H
Legend
A
VESDAnet Terminals
B
Power Terminals
C
Relay Terminals (3,1,2,4,5,
and 7)
D
Relays (1 to 12)
E
Relay Terminals (8,9,10,11,12
and 6)
F
GPI Terminal
G
VESDAnet Socket
H
FOK LED Connectors
