Gnss Fix Output; Zero Velocity Input; Disable Gnss - Advanced Navigation Certus OEM Reference Manual

Certus Reference Manual • Interfacing

9.6.1.3 GNSS Fix Output

Type
:
GPIO Port
:
Auxiliary
:
:
Description

9.6.1.4 Zero Velocity Input

Type
:
GPIO Port
:
Auxiliary
:
Description :
9.6.1.5 Disable Magnetometers
Type
:
GPIO Port
:
Auxiliary
:
Description :

9.6.1.6 Disable GNSS

Type
:
GPIO Port
:
Auxiliary
:
Description :
v2.4
Figure 108: 1PPS Specifications
The pin is normally low and pulses high for 50 milliseconds to signal the precise second.
The 1PPS line starts pulsing approximately 100 milliseconds after power up and always
fires irrespective of whether Certus has accurate time or not. It is important to note that
when Certus acquires time corrections from it's GNSS receiver, the 1PPS signal may fire
at an interval of less than 1 second. This typically only occurs the first time the GNSS
receiver obtains a fix after startup. The time initialised status flag can be used to
determine whether the time and 1PPS line is accurate or not.
The dedicated 9.3 1PPS Signal
recommended 1PPS signals as they have less jitter than the GPIO ports. The validity of
the dedicated 1PPS signal can be monitored using the "time initialised" flag in the
System State Packet.
Digital Output
1, 2
Transmit
In this function, the pin is low when there is no GNSS fix or a 2D fix and high when there is
a 3D, SBAS, Differential or RTK GNSS fix.
Digital Input
1, 2
Receive
When using this function, a high state indicates to Certus that it is stationary. The low
state indicates that the vehicle is not stationary. Use of this function can prevent drift
during periods when a GNSS signal is not available.
Digital Input
All
Receive
This function accepts a digital input with a low state enabling the magnetometers and a
high state disabling the magnetometers.
Digital Input
1, 2
Receive
This function accepts a digital input with a low state enabling the GNSS and a high state
disabling the GNSS.
on the Connector Pin-out or the auxiliary transmit are the
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10.4.1
2024-12-17