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Trane SerialSpy Protocol Analyzer Software
Duplicate Addresses
A common problem is two devices on the network set to the same rotary switch address. At first glance,
the SerialSpy capture appears populated blue diagnostics (see
Figure 18, p.
29). However, one particular
message repeats, "Retry of Token from 40 to 41". This easier to see if you select "Show Diagnostics Only"
in the list box (see
Figure 19, p.
29). Inspection of the token passing messages around this error reveals
that the device addresses are in sequential order. However, the device at address 39 is not present.
In this example the token is passing along normally until it reaches device 40. Because there are two
devices addressed 40, they both respond by passing the token. This triggers a "Retry" diagnostic from
SerialSpy. There are now two tokens bouncing down the link. This condition will not necessarily result in
®
®
a comm down state at the Tracer
SC+, but communication will be very slow on the link and the Tracer
SC+ performance will suffer.
Figure 24. Duplicate address at 40
BAS-SVX51L-EN
35
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