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Table 1. Maximum Air-Fi networks and devices allowed
Max
Equipment
6
WCS
6
WCS
8
Networks
8
Coordinator WCI
30
UC/Symbio™ controllers
31
WCIs
48
WCS
61
Devices
120
UC/Symbio™ controllers
240
UC/Symbio™ controllers
(a)
A WCI on a single UC/Symbio™ controller may have up to 6 WCS sensors associated. Count each WCS sensor as part of the device total.
(b)
Example1: 30 UCs each with 1 WCS sensor associated (30 UCs +30 sensors + 1 coordinator = 61 devices). Example 2: 20 UCs each with 2 WCS sensors associated (20
UCs + 40 WCS + 1 coordinator = 61 devices). Example 3: 8 UCs each with 6 WCS sensors associated (8 UCs + 48 WCS + 1 coordinator = 57 devices.
(c)
This would require a minimum of four (4) networks with 30 unit controllers on each network.
(d)
Example 1: 120 UC controllers on App SC + 120 UC controllers on Base SC. Example 2: 120 UC controllers on App SC + 60 UC controllers on Base SC1 + 60 UC
Controllers on Base SC2. Example 3: 60 UC controllers on App SC + 60 UC controllers on Base SC1 + 60 UC controllers on Base SC2 + 60 UC controllers on Base SC3.
Example 4: 0 UC controllers on App SC + 120 UC controllers on Base SC1 + 120 UC controllers on Base SC2.
Automatic Network Formation and Sensor Association
A WCI that is connected to a Tracer SC+ is auto-assigned as the network coordinator. The coordinator
WCI allows all WCIs and WCSs having matching addresses to automatically join the network. (For more
details about the process of network establishment, see
If no Tracer SC+ is present, a centrally located WCI connected to a programmable or unit controller or a
BCI/BCI2 must be designated as the coordinator. You can designate a WCI to be a coordinator either
manually on the WCI or by using Tracer TU. See
Installation or Without Tracer SC+ Installation ," p.
Wireless sensors with BACnet MS/TP and BACnet/IP (hardwired or Wi-Fi).
After the network is formed, WCSs automatically associate with their designated controllers.
Notes:
Network Security
Air-Fi® Wireless is secured using Advanced Encryption Standard AES-128 (FIPS Pub 197) and HMAC
(FIPS Pub 198). The Trane WCI operating as a Trust Center will create a randomly generated 128-bit
BAS-SVX40K-EN
Usage Level
Per unit controller
Per Air-Fi wireless network when associated
directly to the Tracer SC+.
Per Tracer SC
Per Tracer SC
Per network
Per network
Per Tracer SC+
Per network
(a) (b)
Per Tracer SC
(c)
Per App SC plus Base SC(s)
•
When a WCS is first powered up, it joins the network using any WCI within range including
the coordinator, and repeaters. The WCI becomes the parent for that WCS. As long as
there is adequate signal level the WCS will stay with this parent WCI indefinitely. The parent
WCI passes any WCS messages over the network to the associated unit controller.
•
The network must be open for a WCS to join the network, but does not need to be open for
the WCS to be manually assigned to a controller.
Notes
A total of six (6) Air-Fi sensors can be associated to a unit
controller in any combination (WCS-SB, WCS-SD, WCS-
SO, WCS-SB/R, and WCS-SCO
A total of six (6) Air-Fi wireless sensors can be directly
associated to the SC+ in any combination (WCS-SB,
WCS-SD, WCS-SO, WCS-SB/R, and WCS-SCO
Sensors associated directly to the SC+ counts against the
Devices maximum of 61.
App and/or Base
1 Tracer SC coordinator WCI per network
1 Tracer SC coordinator WCI + up to 30 UC router WCIs +
WCI Repeater(s)
Each SC+ Air-Fi Wireless network can have up to 6
sensors directly associated. An SC+ would have to have
8 wireless networks in order to have 48 sensors
associated (6 sensors per network x 8 networks = 48).
Sensors associated directly to the SC+ count against the
Devices maximum of 61.
1 Tracer SC coordinator WCI + up to 30 UC router WCIs +
WCSs + WCI Repeater(s)
Applies to both App and Base SC(s)
See note
(d)
below for examples
"Establishing an Air-Fi® Network," p.
"Establishing the Network Prior to Tracer SC+
63. This scenario includes the application of Air-Fi
Overview
)
2
).
2
60.
11
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