User manual

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Troubleshooting Guide
Thisguidewillconcentrateonallrelevanttroubleshootingissuesabovesimplecableconnectionfaults.Therefore,the
cablesbetweentheNDC-4hardwareandanyotherdevicesshouldbecheckedasamatterofcourse,beforecontinuing
with this guide.
Diagnostic LED
The NDC-4 hardware supports a tricolour 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.
LED Colour /
Flash Count
Mode / Error condition Required User Response
Start up operation modes
Thesequencebelowindicatesasuccessfulpower-upofthe
NDC-4 with no data on any of the input channels.
LED is off Power down mode
TheNDC-4hasnopower,conrmthebatteryisconnected
correctly.ForUSBpoweredunits,ensurethecableis
connected and the USB drivers are installed.
Red,
Noashing
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.
Amber,
Noashing
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ashing
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-4 hardware.
Running modes
Belowaretheothercorrectoperatingmodespossiblewiththe
NDC-4.
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-4hardware.FlashrateproportionaltoRxrate.
Red,
Noashing
Flash updating mode,
No error
No response required. LED will stay red for the duration of the
ashupdateoperation(usingActipatch).Onceoperation
complete,NDC-4hardwarewillbeautomaticallyreset.
Error mode
BelowisapossibleerrormodefortheNDC-4.Iftheerror
persists see “Returns Procedure” on page 20.
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-4 hardware.
Table 1 – Diagnostic LED Colours