10,11,14-20 No connection
21-25 Ground (same ground as power supply ground on DB 9).
LED states
The RDAC CAN has a LED lamp next to the DB-9 connector. This LED can be used do
diagnose fault and connection issues.
The LED has a two second period in which it flashes once, twice or three times depending on
condition.
LED flashes once:
RDAC CAN has power and processor is working. No communications to either ECU or EFIS.
LED flashes twice rapidly:
RDAC CAN has power and processor is working. Receiving data from ECU (either via CAN or
RS232) . Not connected to EFIS.
LED flashes twice slowly:
RDAC CAN has power and processor is working. Receiving data from EFIS. Not receiving
data from ECU (Engine RPM transmitted as 9001 in this case to inform pilot).
LED flashes three times:
RDAC CAN has power and processor is working. Receiving data from ECU and EFIS.
LED is off:
RDAC CAN is not powered or faulty.
LED is on:
RDAC CAN is powered but processor is not working or halted. The halted condition may
occur in some cases if CAN wiring is incorrect preventing the processor from joining the CAN
network after application of power (In this case the wiring is such that the network appears
"busy" all the time. In this case try powering the RDAC after removing the CAN network - if
the LED flashes then please check the CAN network wiring).
Grounding the RDAC CAN
Engine ground is deemed to be hazardous to EFIS systems. For this reason ensure that there
is no direct ground connection between the engine block and the RDAC CAN device.
Connect the RDAC CAN do the engine only by means of the two CAN data lines. This
assumes that the engine block is grounded to the battery negative and the avionics supply
bus also has a connection to the same battery negative. There must not be any other ground
connection between the engine and the avionics as this could cause large currents to flow in
the avionics grounds and this in turn can cause serious damage.
If you are using a shielded cable to connect the RDAC CAN to the ECU, ensure that the
shield is grounded on one side only so it does not form an electrical ground connection
between the RDAC CAN and the engine block.
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