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BACnet Segmented Messages

Issue

A third party BACnet device does not support segmented messages but the bCX4040 does. Can the two devices communicate?

Environment

Continuum

BACnet MS/TP MSTP

bCX

Cause

A third party boiler BACnet MS/TP interface card is having difficulty communicating with a bCX4040. The manufacturer of the interface card has commented that the Continuum bCX uses segmented packets and the Bacnet interface card cannot communicate with a segmented packet delivery system.  Are these devices incompatible?

Resolution

The problem should not be related to message segmentation. This is because the bCX will try to send a segmented message and the third party device should send a response to the bCX indicating that segmentation is not supported. The BCX will then send only non-segmented messages to the device. So, the bCX supports message segmentation but can do both segmented and non-segmented messages on the same MS/TP bus. 

Get an MS/TP capture with both devices on the wire while doing a Find BACnet Devices request from CyberStation and send to Product Support for review.

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