Functions provided by the RDAC CAN
The RDAC CAN provides a number of additional sensor monitoring inputs on the D-25
connector.
Fuel level sender inputs
These inputs are marked “FL1” and “FL1”.
These are intended for connection to resistive fuel level senders. The RDAC CAN provides
internal pullup resistors (470 ohms to 3.6V). These pullup resistors are switched into the
circuit if the internal DIP switch array 7 and 8 are in the “ON” position.
If the switches are “OFF” it is possible to connect electronic level senders with a voltage
output provided the output voltage is in the range of 0V to about 3.3V.
The fuel level sender readings are presented to the EFIS in a fashion compatible with the
RDAC XF.
DC current monitoring input
Connect a DC current monitoring sensor to input “Curr2”. The current sensor should produce
a voltage of around 2.5V for a zero current and increase or decrease this voltage depending
on the magnitude and direction of the current. Range is 0-5V.
Perform zero and gain calibration in the EFIS Voltage/Current setup as required.
Connector pins
DB9 connector
1
Ground
2
+12V
3
RS232 RX (connect to RS232 TX from ECU)
4
No connection
5
No connection
6
CAN EFIS Low
7
CAN EFIS High
8
CAN ECU Low
9
CAN ECU High
Note: Should both the RS232 as well as the CAN ECU be wired and data is received on both,
data sent to the EFIS will be that received on the CAN side.
DB25 connector
1-7 No connection
8
Current sensor input
9
Not used (reserved for future use)
12
Fuel level sender 2 input
13
Fuel level sender 1 input
