Navsight Solution
– Hardware Manual
NAVSIGHTHM.1.5
5.14.4. GNSS connection in RS-232 mode
For this typical connection, a shielded 26 AWG 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 GNSS
NMEA signals should be separated in two cables for better noise immunity.
5.14.5. Duplex interfacing in RS-422
Below is shown a serial port interface, configured using a full duplex RS-422 operation. The recommended
cable is a shielded twisted pairs 26 AWG cable, and a termination resistor should be placed at receiver side.
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Figure 5.22: Typical wiring diagram for Navsight with external GNSS receiver
NAVSIGHT
PORT #
GND
SYNC IN
RX
SHIELD
GPS
GPS Tx
PPS
GND
Shield is the mechanical ground.
Connected to Navsight Enclosure
Figure 5.23: Main serial interface full duplex connection in RS-422 mode
R2
NAVSIGHT
PC
GND
PORT # Tx+
PORT # Tx-
PORT # Rx+
PORT # Rx-
PC Rx-
PC Rx+
GND
PC Tx-
PC Tx+
R1 termination resistor is integrated in Navsight
R2 is recommended for long distance
communication. Should be placed at receiver side.
R1
