Actisense™
Page 10© 2005 Active Research Limited
LED Colour /
Flash Count Mode / Error condition Required user response
Normal operation modes The sequence below indicates a successful power-up of the
NDC-3 and the commencement of data combining.
Red,
No flashing
Start-up mode,
No error
No response required. A normal operation mode that should
last for no more than 1.5 seconds. Any longer indicates an
error with the main program.
Red,
No flashing
Flash updating mode,
No error
No response required. LED will stay red for the duration of the
flash update operation (using Flash Centre). Once operation
complete, NDC hardware will be automatically reset.
Amber,
No flashing
Initialise and self-test mode,
No error
No response required. A normal operation mode that follows
after the Start-up mode and should last for approximately 1
second.
Green,
No flashing
Normal and no data mode,
No error
No response required. A normal operation mode that follows
the Initialise and self-test mode. Indicates that no error was
detected during the self-test operation.
Also indicates that no data is currently being received by the
NDC-3 hardware.
Green,
Flashing
(1-10 per second)
Normal and data Rx mode,
No error
No response required. A normal operation mode that indicates
that data is currently being received (on at least one channel)
by the NDC-3 hardware. Flash rate proportional to Rx rate.
Error conditions If the error persists the NDC-3 unit should be returned to
Actisense™ (refer to the Contact Information section).
Amber,
Flashing
(Once every 4
seconds)
Error trap mode,
EEPROM memory error
An error with the EEPROM memory has been detected during
the self-test mode.
Reset the NDC-3 hardware.
Table 1 – Diagnostic LED colours
Troubleshooting guide
This guide will concentrate on all relevant troubleshooting issues above simple cable connection faults. Therefore, the
cables between the NDC-3 hardware and any other devices should be checked as a matter of course, before continuing
with this guide.

Diagnostic LED

The NDC-3 hardware supports a tri-colour diagnostic LED that indicates the current operating mode of the hardware, or
if an error has been detected during the self-test initiation process. Table 1 details what each LED colour represents and
if any user interaction is required.