EKINOX Series
– Hardware Manual
EKINOXV3HM.1.2
4.6.3. Main interface connection on RS-422
Below is shown the main interface (Port A) connection, using a full duplex RS-422 connection. The
recommended cable is a shielded twisted pairs AWG26 cable.
Note the termination resistors (Usually 120 ohms) that can optionally be placed on receiver side to avoid
communication errors in long distance communications. These resistors can be omitted in short distance
communications in order to reduce power consumption.
A protocol selector pin is connected to GND in RS-422 mode.
4.6.4. CAN Bus typical wiring
CAN bus is designed to operate with low cost twisted pairs cables. The bus may be terminated by a single
60 ohm resistor, or multiple resistors on each bus ends (as long as the equivalent parallel impedance is 60
ohm). This resistor is not present in the Ekinox.
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Figure 4.13: Main serial interface full duplex connection in RS-422 mode
R2
R1
RS-232 / RS-422
selector connected
to GND
INS
Main Connector
PC
Shield is the mechanical ground.
Connected to Apogee Enclosure
GND
PORT A Tx+
PORT A Tx-
SHIELD
RS232 / RS422
PORT A Rx+
PORT A Rx-
PC Rx-
PC Rx+
GND
PC Tx-
PC Tx+
R1 and R2 are optional.
recommended for long
distance communication
Figure 4.14: Basic CAN bus wiring
R
INS
Main Connector
DEVICE 1
Shield is the mechanical ground.
Connected to Apogee Enclosure
CAN H
CAN L
CAN L
CAN H
DEVICE 2
CAN L
CAN H
A 60 ohm termination
resistor is required
somewhere on the CAN
bus
