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Xtralis VESDA
®
VESDAnet Interface Card Product Guide
Wiring to VESDAnet
VESDAnet is a fault tolerant data communication network between VESDA
devices. VESDAnet cables are terminated at the VESDAnet A and B
Terminals on the VESDAnet Interface Card. Communications from another
VESDA device is brought into the VESDAnet Interface Card at one terminal
and looped out to another device on VESDAnet from the other terminal. It is
recommended that (Belden 9841 - 120 Ohm) twisted pair cables, or similar
cables be used.
Figure 4 - VESDAnet wiring with Shielded Twisted Pair-
maintain polarity
Figure 5 - VESDAnet closed loop wiring diagram with
Shielded Twisted Pair
Note: VESDAnet cabling can be wired A+ to A+, B+ to B+, or A+ to B+.
Also, A- to A-, B- to B-, or A- to B-. Shielded wire must be
terminated to the shielded connector.
Note: In the VESDAnet diagrams, the input wiring with circle to the
VESDAnet device communication ports, indicates shielded
twisted pair cable. This also highlights that the shield is
connected, at each cable end, to the “Sh” contact of the
VESDAnet communication port.
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