Bacnet Configuration; Addressing - Lochinvar Knight 81 Instructions Manual

5
BACNET Confi guration
Th e BACnet communication board is equipped with a set of ten dip switches that are used to set the board confi guration (address
and baud rate). Th e fi rst eight are used to set the address of each board. Th e ninth and tenth are baud rate.
Figure 5-1_Communication Board

Addressing

Th e BACnet local addressing space is comprised of 256
diff erent addresses.
• 255 is reserved for broadcast messages from a
master device.
• 128 - 254 are free to use for slave devices only.
• 0 - 127 are free to use for master or slave devices.
Since the BACnet communication board is a BACnet master,
address 127 is the highest address that can be used.
To set the BACnet local address, the dip switches can be set
in either the 0 position or the 1 position. For switches set to
the 1 position their value will be added together to determine
the address.
Each switch set to the 1 position has the following value:
Dip switch 1 = 1
Dip switch 2 = 2
Dip switch 3 = 4
Dip switch 4 = 8
Dip switch 5 = 16
Dip switch 6 = 32
Dip switch 7 = 64
Dip switch 8 = 128
Any dip switch set to 0 has a value equal to 0.
Example:
To set the address of the BACnet board to 50, dip switches
2, 5, and 6 have to be set to the 1 position. Th e address
is determined by adding the values of all the dip switches
together.
ModBus and BACnet Communication Instructions
Address = Value of Dip switch 1 + Value of Dip switch 2 +
Value of Dip switch 3 + Value of Dip switch 4 + Value of Dip
switch 5 + Value of Dip switch 6 + Value of Dip switch 7 +
Value of Dip switch 8
In this example:
Address = 0 + 2 + 0 + 0 + 16 + 32 + 0 + 0 = 50
Th e BACnet Device Instance is calculated by adding the
BACnet local address to 600000. Using the above example, the
Device Instance will be:
Device Instance = 600000 + 50 = 600050
Th e base address (600000 in this example) is model dependant
and can be changed by the integrator. It can be set to any value
between 0 and 4194048. Th e resulting device instance will be
this value + the local address, as before. Once the base address
is changed, it can be reset back to the default base address
(600000 in this example) using the following procedure:
1. Turn OFF power to the interface board.
2. Set Dip switches 1 - 8 to the 1 position.
3. Turn ON power to the interface board.
4. Aft er a few seconds, turn OFF power to the interface board.
5. Set Dip switches 1 - 7 to the desired local address. Set Dip
switch 8 to the 0 position.
6. Turn ON power to the interface board.
Device Name
Th e default device name is "MTR-01 BACnet." Th is can be
changed by the integrator as desired.
Modbus Instructions
DIP SWITCHES
LED'S
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