PT-Link-LON
®
Technical Guide
PT-Link Interface
14
Troubleshooting the PT-Link Controller
PT-Link Board LEDs
The PT-Link-LON
®
is equipped with LEDs that can be used for trouble-
shooting. There are eight LEDs on the PT-Link board.
See Figure 20
for
the locations of the LEDs on the PT-Link board. The LED descriptions
and functions are listed in the following paragraphs.
POWER LED
When the PT-Link-LON
®
is powered up, the “
POWER
” LED should
light up and stay on continuously. If it does not light up, check to be sure
that you have 24 VAC connected to the board, that the wiring connec-
tions are tight, and that they are wired for correct polarity. The 24 VAC
power must be connected so that all ground wires remain common. If
after making all these checks the “
POWER
” LED still does not light
up, please contact WattMaster Controls Technical Support at our Toll
Free number—866-918-1100—for assistance.
LOOP LED
When power is applied to the PT-Link-LON
®,
the “
LOOP
” LED will
also light up. The LED should fl icker rapidly, indicating that the PT-Link
is trying to communicate with the controllers on the loop. A “
fl icker
” is
defi ned as a brief moment when the LED turns off and back on. If the
“
LOOP
” LED does not operate as indicated above, fi rst power down
the unit and then reapply power. If this does not work, please contact
WattMaster Controls Technical Support at our Toll Free number—866-
918-1100—for assistance.
LED 1
When power is fi rst applied, “
LED 1
” will be off temporarily and then
will blink one time for each controller it is communicating with. For
example, if you have 4 controllers on the loop connected to the PT-Link,
“
LED 1
” will blink 4 times. If the amount of blinks does not match the
number of controllers connected to the loop, it indicates there is a com-
munications problem. The best way to fi nd out which board is not com-
municating is to go to each controller and look at its “
COMM
” LED. The
“
COMM
” LED should be solid and will fl icker occasionally indicating
communication with the PT-Link-LON
®
. If the “
COMM
” LED does not
fl icker, there is no communication with that controller.
LED 2
When power is fi rst applied, “
LED 2
” will be off temporarily and then
will blink slowly indicating that the PT-Link baseboard is communicating
with the ProtoCessor Module. If “
LED 2
” does not blink, check that the
ProtoCessor Module is installed correctly on the PT-Link baseboard and
that the “
PWR
” LED is lit up on the ProtoCessor Module.
PROTO LED
When the PT-Link is fi rst powered up, the “
PROTO
” LED should light
up and stay on continuously. If the LED doesn’t light up, check that the
ProtoCessor is installed correctly and fi rmly connected to the Base Board.
The “
PWR
” LED should also be lit on the ProtoCessor Module.
TIMER LED
The “
TIMER
” is used for troubleshooting by WattMaster Controls
Technical Support.
Figure 20: PT-Link-LON
®
LED Locations
WATCH DOG LED
The “
W-DOG
” LED is used for troubleshooting by WattMaster Controls
Technical Support.
HEARTBEAT LED
The “
H-BEAT
” LED blinks to show there is communication between
the controllers and the PT-Link. If the LED doesn’t light up, and all other
checks have been made, please contact WattMaster Controls Technical
Support at our Toll Free number—866-918-1100—for assistance.
