Viconics VT8600 Series BACnet Integration Guide - Manual (Page 23)

VT8600 Series BACnet
®
Integration Manual 23
Viconics Technologies Inc. | 9245 Langelier Blvd. | St.-Leonard | Quebec | Canada | H1P 3K9 | Tel: (514) 321-5660 | Fax: (514) 321-4150
028-0437-00 www.viconics.com | [email protected] March 2015
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CONFIGURATION OBJECTS
If your BAS allows you to remove objects, Viconics recommends removing all configuration objects
once your setup is complete. This prevents unnecessary network
polling and traffic.
WIRING GUIDE
Overview
Viconics uses EIA-485 as the physical layer between their devices and supervisory controllers. A
"Device” represents any product with an active EIA-485 network connection, including Viconics and
non Viconics controllers.
A summary of network specifications are listed below.
Summary Specifications
Parameter Details
Media
Twisted pair 18 AWG, 22 AWG, or 24 AWG
(shielded recommended)
Characteristic Impedance 100-130 ohms
Distributed capacitance Less than 100 pF per meter (30 pF per foot)
Maximum length per segment 1200 meters (4000 feet) Note: 18 AWG cable
Polarity Polarity sensitive
Multi-drop Daisy-chain (no T connections)
Terminations
1. Devices are installed at both ends of the MS/TP
network: 120 Ohms resistor should be installed at each
end.
2. A device is installed at one end of the MS/TP network
and a third-party device is installed at the other end.
Install an End-Of-Line resistor value that matches the
third-party device instruction regarding the End-Of-Line
resistors.
3. Third-party devices are installed at both ends of
the MS/TP network. Follow the third-party device
instructions regarding the End-Of-Line resistors.
Network bias resistors 510 ohms per wire (maximum two sets per segment)
Maximum number of nodes per segment 64 ( Viconics devices only)
Maximum number of nodes per network 128
Baud rate 9600, 19200, 38400, 57600, 76800, 115200 (Auto detect)
Table : Summary of Specifications for a Viconics EIA-485 Network