Trane BACnet MS/TP - Partial Communication Failure

32 BAS-SVX51L-EN
Trane SerialSpy Protocol Analyzer Software
Partial Communication Failure
In cases where there are some good messages getting through the comm link, you can use SerialSpy to
help pinpoint communication problems. Observing the token-passing allows you to identify every device
that is communicating on the link. SerialSpy can also help to find some common problems, such as
duplicate addresses, and to determine which addresses are the likely source of trouble.
Figure 21, p. 32 shows an example of a capture with a single Trane BACnet
®
device on the link. You can
see that even with only one device on the link, the device will eventually start polling and try to find other
devices on the link.
Figure 21. One device polling
After polling to the last
address on the link, device
60 begins again at device 0