EKINOX 2 Surface Series
– Hardware Manual
EKINOX2HM.1.1
4.6.5. GNSS connection in RS-232 mode
For this typical connection, a shielded AWG 26 cable should be used. Depending on PPS signal strength, we
do not recommend this cable to measure more than a few meters. For long distance, PPS signal and GPS
NMEA signals should be separated in two cables for better noise immunity.
4.6.6. Third party aiding equipment connected in RS-422
For this connection, we recommend shielded twisted pairs AWG26 cable. As for main communication
interface, a termination resistor may be required depending on the communication distance.
4.6.7. Triggering external devices with the sync Out
Consider a camera that must take a picture when an event is provided on Event Out pin. Event Out and Sync
Out are “open drain” outputs, which means a pull up resistor must be used on receiver side, as shown on the
diagram.
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Figure 4.15: Typical wiring diagram for Ekinox with external GNSS receiver
INS
Extended Connector
GND
PORT B Sync
PORT B Rx
SHIELD
GPS
GPS Tx
PPS
GND
Shield is the mechanical ground.
Connected to Apogee Enclosure
Figure 4.16: Third party aiding equipment with RS-422 interface
R1
INS
Extended Connector
External device
Shield is the mechanical ground.
Connected to Apogee Enclosure
GND
SHIELD
PORT C Rx+
PORT C Rx-
GND
PC Tx-
PC Tx+
R1 is optional. recommended for
long distance communication
Figure 4.17: Sync Out connection with pull up resistor
Apogee
Main Connector
GND
Event Out
SHIELD
Camera
Event In
GND
Shield is the mechanical ground.
Connected to Apogee Enclosure
R
VCC < 20V
Pull up resistor must be
connected to Event Out
To define High level