4
3
BMS Network settings: MAC address, device instance and Baud rate
BACnet MS/TP: Setting the MAC Address for BMS Network
- Only 1 MAC Address is set for gateway regardless of how many devices are connected to gateway.
- Set the BACnet MS/TP MAC Address of the gateway to a value between 1 to 127 (Master MAC Address); this is so that the BMS front end can
find gateway via BACnet Auto-Discovery.
NOTE: Never set a BACnet MS/TP MAC Address of the gateway to a value from 128 to 255. Addresses from 128 to 255 are Slave Addresses and
can not be discovered by BMS front ends that support Auto-Discovery of BACnet MS/TP devices.
- Set “A” bank DIP switches A0 – A7 to assign a MAC Address to the gateway for BACnet MS/TP.
- Refer to Appendix 1 for the complete range of MAC Addresses and DIP switch settings.
NOTE: When setting DIP switches, ensure that power to the board is OFF.
BACnet: Calculating the default device instance
The device instance value is automatically generated using the following formula:
BACnet device instance = (Device Node ID) + (Default Node Offset)
NOTE: The default node offset is 50,000.
For example, if device A has a node ID of 1 and device B has a node ID of 2, then:
BACnet device instance A = (1) + (50000) = 50001
BACnet device instance B = (2) + (50000) = 50002
To reach a specific BACnet device instance result, refer to the chapter 6.
BACnet MS/TP: Setting the Baud rate for BMS network
DIP switches B0 – B3 can be used to set the field Baud rate of the gateway to match the Baud rate required by the BMS for BACnet MS/TP.
NOTE: When setting DIP switches, ensure that power to the board is OFF
Baud Rate DIP Switch Selection
Baud
B0
B1
B2
B3
9600
On
On
On
Off
19200
Off
Off
Off
On
38400*
On
On
Off
On
57600
Off
Off
On
On
76800
On
Off
On
On
* Factory default setting = 38400
S3 DIP Switch Auto-Discovery Mode
S3
Auto-Discovery ON - Build New Configuration
On
Auto-Discovery OFF - Save current Configuration
Off
Enabling Auto-Discovery
NOTE: if Modbus TCP/IP was selected for the field/BMS protocol, skip this section.
Auto-Discovery is not used for MODBUS TCP/IP.
The S3 DIP switch is used to both enable Auto-Discovery of known devices attached to the gateway and save the recently discovered configuration.
If the gateway is being installed for the first time, set the S3 to the ON position to enable Auto-Discovery. The ON position is when the DIP switches
are set clotest to the inside of the box.