Trane Tracer Uc page 27

Table 5. LED Activities and Troubleshooting Tips (continued)
LED Name Activities
Link and IMC
Shows solid green when the LED has
Service
Binary B01
through B09
VAV-SVX07B-EN
TX blinks green.
RX blinks yellow.
LED is not lit.
been pressed.
LED not lit.
Shows solid yellow.
LED not lit.
Indication and Troubleshooting
Tips
Blinks at the data transfer rate when the
unit transfers data to other devices on
the link.
Blinks at the data transfer rate when the
unit receives data from other devices on
the link.
• ON solid yellow; indicates there is
reverse polarity.
Indicates that the controller is not
detecting communication.
• Not lit; cycle the power to reestablish
communication.
Indicates controller is operating
normally.
Indicates a corresponding binary output
has been commanded ON.
• Relay coil; indicates that a command
has been made to energize.
• TRIAC; indicates that a command has
been made to turn ON.
Indicates that a relay output is de-
energized or no power to the board.
• Not lit; cycle power to reestablish
communication.
Controller Operation
Notes
TX LED: Regardless of connectivity or
not, this LED will constantly blink as it
continually looks for devices to
communicate to.
LED not lit:
Determine if, for example, a Tracer SC or
BACnet device is trying to talk to the
controller or if it is capable of talking to
the controller. Also determine if the
communication status shows down all of
the time. In addition, check polarity and
baud rate.

.
When the UC400 is placed into boot
mode, the system will not run any
applications such as trending,
scheduling, and TGP2 runtime. The
controller is placed into boot mode if the
service pin is held in when power is
applied. In boot mode, the controller is
non-operational and is waiting for a new
main application to be downloaded.
If the user is currently powering the
UC400 from a USB port, the Led lights
will turn ON. However, the binary
outputs will not be activated.
Commanded ON; As an example of
commanded ON, a command could be a
manual command such as an override or
a command could be from TGP2 based
on a list of conditions that are met telling
these outputs to turn ON.
LED not lit:
Did the user command it to be ON? If
yes, see the Marquee LED at the top of
this table.
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