Crestron
C2N-NPA8
Network Poll Accelerator
Problem Solving
Problems may occur with the 2-Series automation control system itself or there may
be serial communication difficulties with other devices connected to the control
system. The next two sections address possible problem solving tools or procedures
for each situation.
Troubleshooting the C2N-NPA8
The following table provides corrective action for possible trouble situations. If
further assistance is required, please contact a Crestron customer service
representative.
C2N-NPA8 Troubleshooting
TROUBLE
POSSIBLE
CAUSE(S)
CORRECTIVE ACTION
Unexpected
response from
control system.
Network devices are not
communicating to the
control system.
From the Viewport, poll the network
(F4) to verify communication.
Intermittent
communication with
Cresnet device.
Possible wiring fault.
Use Network Analyzer to check
connection with Cresnet device.
PWR LED does not
illuminate.
Segment is not receiving
power.
Verify that 24V power is applied to
either segment A or B of the
C2N-NPA8.
Verify that the segment is connected to
a powered segment.
ERR LED
illuminates.
Hardware failure,
software failure, or
programming error.
Verify that the hardware configuration
matches software configuration. Poll
the network (F4) from the Viewport;
check error log for SIMPL, SIMPL+
program reload errors.
Used wrong serial port.
Verify that a Poll-Accelerator-
compatible port is used if using serial
communications (refer to chart on page
6 for details).
Serial cable miswired.
Verify that serial cable is wired correctly
if using serial communications.
Serial cable pins do not
make proper contact with
DB9 socket.
Remove the two standoffs on either
side of the DB9 socket.
Incorrect IP information.
Verify correct IP information on control
system and C2N-NPA8.
C2N-NPA8 does
not communicate
with control system.
Incorrect Network Cable.
Use cable with pinouts described in
“Serial Communications Between a
Control System and the C2N-NPA8” on
page 13 or Connecting the C2N-NPA8
to the Control System via Ethernet” on
page17.
Incorrect power supply.
Use power from a Crestron power
source.
System does not
function.
Various.
Refer to the “Troubleshooting Non-
Functioning Units” procedure following
this table.
Operations Guide – DOC. 6087A
Network Poll Accelerator: C2N-NPA8
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