Viconics VT7600F Integration Guide BACnet - Manual (Page 21)

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Configuration Objects
The following objects and group objects should be typically used for configuration purposes:
¾ General Options 1 Group GRP 46 and its complete list of objects;
¾ General Options 2 Group GRP 58 and its complete list of objects;
¾ With schedule Model Configuration Options Group GRP 69 and its complete list of objects;
¾ Stages Configuration Options Group GRP 72 and its complete list of objects;
¾ Economizer Model Configuration Option Group GRP 76 and its complete list of objects;
¾ Heatpump Model Configuration Option Group GRP 81 and its complete list of objects;
¾ Dehumidification Model Configuration Option Group GRP 87 and its complete list of objects;
¾ Humidification Model Configuration Option Group GRP 94 and its complete list of objects;
If your BAS allows you to remove objects from your database, Viconics recommends removing all configuration
objects once your setup is complete. This will prevent unnecessary polling of non used objects and will help speed
up the network.
Wiring guide
Overview
Viconics uses EIA-485 as the physical layer between their devices and supervisory controllers
For clarity we will use the term “Device” to represent any product with an active EIA-485 network connection,
including Viconics and non-Viconics controllers.
Summary Specifications:
Parameter Details
Media Twisted pair 22AWG-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: AWG 18 cable
Polarity Polarity sensitive
Multi-drop Daisy-chain (no T connections)
Terminations 1. Viconics’ devices are installed at both ends of the
MSTP network:
120 Ohms resistor should be installed at each end.
2. A Viconics device is installed at one end of the MSTP
network and a 3 rd party device is installed at the other
end:
Install an End-Of-Line resistor value that matches the 3 rd
party device instruction regarding the End-Of-Line resistors
3. 3
rd party devices are installed at both ends of the MSTP
network:
Follow the 3
rd party device instructions regarding the End-
Of-Line resistors.
Network Bias Resistors 510 ohms per wire (max. of 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, 76800 (Auto detect)
Table 1: Summary of Specifications for a Viconics’ EIA-485 Network