A remote station, which runs on a QNX-based controller is the only device that supports a BACnet MS/TP port.
Prerequisites: You are working in
Workbench running on a PC. You have added an MX/TP port to the
- Expand and double-click MstpPort in the Nav tree.
- Set the
Network Number from -1 to the BACnet network number for the network segment to which you are connecting and click Save.
- If this is an existing BACnet installation, make sure to use the same network number that is already in use.
- If this is a new BACnet installation, configure this number as needed.
- Double-click the
Link component in the property sheet.
- Set the
Port Name to RS-485. The station can have a total of three RS-485 ports:
- Set the
Port Name to COM3 with a regular option card.
- Set the
Port Name to COM3, COM4 or COM5 with a dual-RS-485 option card.
- Do one of the following:
- Leave the
Mstp Address at 0 (the default), and verify that no other MS/TP device has a same address.
- Set the
Mstp Address to a unique BACnet MAC address on the MSTP trunk.
The valid range is from 0 (default) to 127 decimal. Each BACnet device on the MS/TP network segment must have a unique MAC
address. If there is ever a lost token, the device with the lowest MAC address regenerates the token (in this case it will
be the station).
- Set the
Max Master to the highest known master device on the network with possible room for expansion.
- Set the
Max Info Frames to the range from 0 to 100.This property controls how many messages are sent before passing the token. In some cases, increasing this value up to 50
may improve performance.
- To save the
MstpPort changes, click Save.
- Right-click the
MstpPort (in property sheet or Nav side bar), and select .The Status property under MstpPort should report {ok}.