Viconics VTR7300 BACnet Integration Manual - Manual (Page 31)

31
Troubleshooting Section
Error / Trouble
Condition Possible Cause Solution
Thermostat does not
come online
Two or more controllers have the same
MAC address. Modify each duplicate address to a
unique number.
The MS/TP network has too many
devices. Do not exceed the maximum number of
devices and maximum length allowed
by the EIA-485 specifications.
Too many devices were installed
without any repeaters. Repeaters need to be installed as
specified in this document.
The MS/TP cable runs are broken Locate the break and correct wiring
MS/TP connections at the module are
reversed Respect polarity of the wires on a
MS/TP network.
The thermostat does not have power Apply power to the thermostat