VESDA VESDA-E VES-A00-P, Product Manual

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VESDA-E VES-A00-P Product Guide
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4.3.5 VESDAnet
VESDAnet is a bidirectional data communication network between connected VESDA-E devices. VESDAnet
connectivity is available on the VES-A00-P detector. Refer to Section 2.6 for further information.
It is recommended that RS 485 (Belden 9841 - 120 Ohm) twisted pair cables be used for including the devices
in the network.
The network cables are terminated at the VESDAnet A and B Terminals. Cabling from one VESDA-E device
is brought into the detector at one terminal and looped out to another device on VESDAnet from the other
terminal.
Notes:
l
The polarity of the data wires must be maintained throughout the network.
l
The connection order of Port A or Port B between detectors is not important as both ports function
identically.
l
In order for the detector to be able to detect ground faults on the VESDAnet wiring, the Ground Reference
Terminal (Figure 4-33) must be connected to the local ground.
A+
A-
B-
Shield
Module 1 Module 2 Module 3
Module 5 Module 4
Shield
B+
A+
A-
B-
Shield
Shield
B+
A+
A-
B-
Shield
Shield
B+
A+
A-
B-
Shield
Shield
B+
A+
A-
B-
Shield
Shield
B+
Figure 4-35: Example closed loop VESDAnet network
The VESDA-E VES-A00-P detector is shipped with the VESDAnet A and B terminals looped. Remove the A
and B links prior to connecting the detector to the VESDAnet. If the detector is not to be networked with other
devices, then do not remove the A and B links.
Shield
A-
A+
Shield
B-
B+
Figure 4-36: Closed loop for standalone detectors with VESDAnet capability
Note: Refer to the VESDA-E Communications Guide for further information.
Ground Fault Detection
In order for VESDAnet ground fault detection to be active connect the Chassis Ground Terminal (Q -
Figure 4-33) to the building ground and insert a jumper on the Ground Fault Monitoring Jumper terminals (V -
Figure 4-33).