UM-15093500-AA1
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4.4
BACnet Objects and Network Configuration
Transmission types
•
Physical layer: Wi-Fi 802.11 b/g/n
•
Protocol: BACnet/IP
•
UDP Port Number: BAC0 (47808)
•
MAC address: Wi-Fi chip MAC address found written on the back side of thermostat or in
Engineering Menu item (Phy3). This can assist when multiple Wi-Fi thermostats are installed.
•
Device Instance: 700001
Initial Configuration
All configuration parameters are settable through use of the buttons on thermostat by entering the
Engineer Menu
, or once installed on the BACnet network, configuration can also be altered using
BACnet commands. Network command-based configuration can also be accomplished using a Wi-Fi
enabled laptop/computer/tablet/smart phone and Contemporary Controls’ free
Wi-Fi Communication Configuration
Overview
The BAST-421C-BW2 Wi-Fi thermostat is preconfigured with a
BACnet Device Instance
of
700001
and
a
UDP Port Number
of
47808
(decimal) equivalent to
BAC0
(hexadecimal).
Addressing
A unique
Device Instance Number
throughout the entire BACnet internetwork is required to distinguish
the device from all other BACnet devices. When more than one BASstat is installed at the same time,
their
Device Instance Number
must be configured prior to connecting to the BACnet/IP network or
BACnet communication will fail due to duplicate device instances.
Device instance can be modified in
Engineering Menu
items (dEVH) – high bytes and (dEVL) – low
bytes. Device Instance = (dEVH)*1000+(dEVL). Device Instance example: if (dEVH) is set to 4194 and
(dEVL) is set to 7,
Device Instance Number = 4194007. Device Instance Number
can also be changed
by writing to BACnet object [
AV21
]
Device Instance
once the thermostat is online. The BACnet UDP
Port Number can be configured in
Engineering Menu
item (UdP).
BACnet/IP Wi-Fi (
BW2
) model will initially boot up as a Wi-Fi Access Point to allow for IP configuration.
This requires connecting to the thermostat as an access point for initial configuration using a Wi-Fi
enabled laptop/computer/tablet/smart phone. Look for the BAST-421C-BW2 with its unique SSID of
“WiFi-788C-xxxx” and no access point passphrase by default (simply click to connect to Access Point).
The digits “xxxx” in “788C-xxxx” are the last 4 digits of the thermostat’s Wi-Fi chip MAC address found
written on the back side of the Wi-Fi module.
This ensures a unique SSID for discovery and configuration and it can assist in identification of
thermostats when multiple Wi-Fi stats are installed on the same site (unique identifier outlined in blue in
the image below). This unique identifier can also be viewed in
Engineering Menu
item (
Phy3
).