How do I get a MSTP capture file so that I can analyze comm activity on an MSTP bus?
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Third party BACnet devices
Analyze MSTP traffic via capture.
To capture MSTP comm activity to a capture file that can be analyzed using a network sniffer application such as WireShark you will need the following.
USB TO RS485 ADAPTER
MSTP Capture application such as MSTPCap.exe
- Connect the USB adapter cable to the usb port on a laptop PC
- Connect the RS232/RS485 adapter to the 9 pin end of the USB adapter cable.
- Attach a length of MSTP bus cable to the wire terminal on the RS485 adapter.
- Copy the MSTP Capture application to C:\
- Open a command window.
- Launch the application by entering C:\> Mstpcap com# ###### where com# is the PC's serial port (Com1, Com2, etc.) and ##### is the current baud rate the BCX MSTP bus is configured for (19200, 38400, etc.).
- The command window will indicate the name of the file the activity is being captured to.
- Once you are done close the command line window
The capture data can be viewed by running WireShark. Select File > Open and navigate to the folder the capture file was saved to and select the capture file.
With the higher end MSTP capture tools such as tools developed by PolarSoft and Cimetrix, MSTP captures at 76.8K baud are possible. Lower end capture applications like MSTPCap typically are only able to capture MSTP packets from networks running at buss speeds at or below 38.4K baud.