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Set the rotary switch address on all unit controllers.
All Trane BACnet
On the front of the unit controller are three decimal rotary dials labeled with the word ADDRESS. Rotate
the dial and position the arrow of each dial to point at the preferred number.
examples how to set a rotary switch address for preferred address of 63 and 103.
Figure 11. Rotary switch address settings
All devices regardless of manufacturer must have a rotary switch address. Third-party BACnet
manufacturers can use a different method to set the address. Consult the appropriate documentation to
determine how to set the address on third-party devices.
Ensure no duplicate rotary switch addresses exist on a BACnet
All BACnet
Sequentially address BACnet
Important:
Sequential rotary addressing is very important for BACnet
communications mechanism polls devices at each address between the lowest and the highest address
found. If a device rotary address is skipped, additional, unnecessary messages will be sent, which will
consume additional bandwidth.
Note: BACnet
When multiple Tracer
set to a unique address. The valid rotary switch address range for the SC+ is 1 to 419.This is critical to
avoid duplicate BACnet
Note: Max Manager is an MS/TP configuration property that may be used to define the highest rotary
BAS-SVX51L-EN
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unit controllers use the same method to set the rotary switch address of the device.
63
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devices on the same MS/TP network must have a unique rotary switch address.
When there are two links used on a Tracer
rotary address 1.
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MS/TP controllers can be addressed independent of where they are located on a link,
as long as all devices wired on a link are addressed sequentially without gaps. For example, a link
of devices could be addressed "1, 3, 5, 2, 4, 6" where all addresses sequentially from 1 to 6 exist
despite their physical location. Conversely, addressing devices "1, 3, 5, 7, 9, 11" would have 5
skipped addresses which would adversely impact link performance unnecessarily.
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SC+s are used on a project, each Tracer SC+ must have its rotary switch address
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Device IDs and network numbers on a site.
switch address that is currently in use on the network. For most devices this value is fixed at 127,
which is the highest rotary switch address that may be set on the network. Some third-party
devices allow this value to be modified.
A situation can exist where a device is being added to the MS/TP network at a rotary switch address
that is higher than the Max Manager value set in the device with the next highest rotary switch rotary
switch address. If this is the case, the token will not get passed to the new device until the Max
Manager property of other device is increased equal to or greater than the rotary switch address
of the new device.
103
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MS/TP devices; leave no gaps.
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SC+, each link should start with controller
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MS/TP links. The BACnet
Best Practices
Figure 11, p. 19
shows two
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MS/TP link.
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MS/TP
19
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