BAS-SVX51L-EN 15
Best Practices
Setting the BACnet
®
Device Addresses
This section describes the best practices for setting the rotary switch values on a BACnet
®
MS/TP link.
Rotary Switch Values and BACnet
®
Device ID
Rotary Switch Values
The rotary switch value is the physical address of a device on a network. It is often referred to as the MAC
address. The term is generic and is used to denote the physical address of many types of networks. For
example, the rotary switch address of a BACnet
®
MS/TP network has a valid range of zero (0) to 255 and
can be represented by a single byte. The MAC address of an Ethernet network is six bytes in length. Each
device must be assigned a unique rotary switch address. Failure to assign a unique value to each device
will result in communication errors.
BACnet
®
Device ID
The BACnet
®
Device ID uniquely identifies each BACnet
®
device as a logical address. The valid range
of this address is 0 to 4194302 (see BACnet
®
standard 2016 sections: 22.1.5 and 24.2.4). For example,
the logical address in an Internet Protocol (IP) network is the IP address, which is four bytes in length and
is typically written in the format of 192.168.1.125. Failure to assign unique address to each device will
result in communication errors.
How Rotary Switch Addresses and BACnet
®
Devices IDs Work Together
When rotary switch addresses and BACnet
®
Device IDs are configured as shown in Figure 9, p. 16 the
result is a unique BACnet
®
Device ID for each device.
• In a three-story building, there is a Tracer
®
SC+ installed on each floor.
– The rotary dial setting on the Tracer
®
SC+ on the first floor is set to 001.
– The rotary dial setting on the Tracer
®
SC+ on the second floor is set to 020.
– The rotary dial setting on the Tracer
®
SC+ on the third floor is set to 300.
• Each Tracer
®
SC+ has two BACnet
®
links with two UC400 controllers wired to each link (four UC400s
total on each floor). The rotary dials on the UC400 controllers are set to 001 and 002.
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