VESDA by Xtralis VESDA VLI Product Guide
www.xtralis.com 21
Compliance
It is recommended that the power supply be compliant with local codes and standards required by
the regional authority. For code-specific information, see Codes and Standards Information for Air
Sampling Smoke Detection on page iii.
3.2.2 VESDAnet
VESDAnet is a bidirectional data communication network between connected VESDA devices.
VESDAnet connectivity is available on the VESDAnet enabled VLI detector (VLI-885). Refer to
section 2.7.1 for further information.
It is recommended that RS 485 (Belden 9841 - 120 Ohm) twisted pair cables, or similar cables be
used for including the devices in the network.
The network cables are terminated at the VESDAnet A and B Terminals on the VESDAnet card.
Cabling from one VESDA device is brought into the detector at one terminal and looped out to
another device on VESDAnet from the other terminal.
Notes:
l Connection between devices should be from A to B. Avoid using A to A or B to B.
l The polarity of the data wires must be maintained throughout the network.
Figure 3-8: Example closed loop VESDAnet network
The VLI-885 detector is shipped with the VESDAnet A and B terminals looped. Remove this loop
prior to connecting the detector to the VESDAnet. If the detector is not to be networked with other
devices, then do not remove this loop.
Figure 3-9: Closed loop for standalone detectors with VESDAnet capability
Note: Refer to the VESDA Communications Guide for further information.
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