Trane Tracer UC400 - Page 27

VAV-SVX07F-EN 27
Controller Operation
Link and IMC
TX blinks green.
Blinks at the data transfer rate when the
unit transfers data to other devices on
the link.
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 devic
e i
s 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.

.
RX blinks yellow.
Blinks at the data transfer rate when the
uni
t r
eceives data from other devices on
the link.
• ON solid yellow; indicates there is reverse
polarity.
LED is not lit.
Indicates that the controller is not
detecting communication.
• Not lit; cycle the power to reestablish
communication.
Service
Shows solid green when the LED has
been p
ressed.
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.
LED not lit.
Indicates controller is operating
nor
mall
y.
Binary B01
through B09
Shows s
olid yellow.
Indicates a corresponding binary output
has b
ee
n commanded ON.
• Relay coil; indicates that a command has
been made to energize.
• TRIAC; indicates that a command has
b
een made
to turn ON.
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
com
manded 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
, s
ee the Marquee LED at the top of
this table.
LED not lit.
Indicates that a relay output is de-
e
ne
rgized or no power to the board.
• Not lit; cycle power to reestablish
communication.
Table 8. LED Activities and Troubleshooting Tips (continued)
LED Name Activities
Indication and Troubleshooting
Tips Notes