Viconics VT8600 Series BACnet Integration Guide Instrukcja Użytkownika Pobierz pdf (Strona 25)

VT8600 Series BACnet

Integration Manual

028-0437-00 www.viconics.com | sales@viconics.com March 2015

Figure 4 shows one node for the main SC panel and 4 for the controllers, for a total of 5 nodes. If there are

more than 64 devices, install repeaters to extend the network.

Maximum Cable Length

The maximum length of a chain is related to its transmission speed. The longer the chain, the slower the

speed. Using proper cable, the maximum length of an EIA-485 daisy chain is 4000-ft (1200 m). This only works

reliably for data rates up to 100,000 bps. Viconics maximum data rate is 76,800 bps.

If you require a maximum

network length of more than 4000 feet, repeaters are required to extend the network.

EIA-485 Repeaters

If you have more than 64 devices, or require a maximum network length of more than 4000 feet, repeaters are

required to extend the network.

End Of Line (EOL) Resistors

Figure-5 Correct Repeater Use in an EIA-485 Network

Figure 4 : Example Network - 5 Nodes

EOL

Resistor

EOL

Resistor

EOL

Resistor

EOL

Resistor

EOL

Resistor

EOL

Resistor

EOL

Resistor

EOL

Resistor

Supervisory

Controller

Repeater

Node 1 Node 2 Node 3 Node 4 Node 5

*NOTE: End Of Line resistors do not count as nodes.

EOL

Resistor

Supervisory

Controller

EOL

Resistor

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 40 41

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