Kongsberg Seapath 320, Installation Manual, Page: 33 / 152

Installation Manual
M300-62/rev.2 17
Pin no. Signal
RS-422 RS-232
1 RX_A CTS
2 RX_B RX
3 GND GND
4 TX_A RTS
5 TX_B TX
Table 5 Pin layout of Com 9 through Com 14
PPS signal
A 1 pulse-per-second (1PPS) signal synchronized with GNSS time is available from the
6 pin terminal at the rear of the Processing Unit. This RS-422 1PPS signal originates
from the GNSS receiver within the Processing Unit. The 1PPS signal is buffered and
fed to the terminal. The 1PPS signal is active high and has a pulse width of 10 ms. The
1PPS is generated exactly once every second with its rising edge synchronised to GPS
time.
Compared to the Seapath 200 models which have a BNC connector this Seapath model
uses a serial signal. Pin no. 1 (TX_A) has a positive edge at the beginning of the pulse
and pin no. 2 (TX_B) has a positive edge at the end of the pulse.
Pin no. Signal Direction
1 1PPS TX_A Output
2 1 PPS TX_B Output
3 GND isolated Output
4 GND isolated Input
5 1PPS RX_A Input
6 1PPS RX_B Input
Table 6 Pin layout of PPS port
Synchronized with this signal it is possible to output 1PPS time tag messages from
Seapath. These messages are the 1PPS NMEA ZDA (format no. 13) or the Trimble
compatible message (format no. 14).