Doc. No: Unex-QSG-21-002
13/21
A printed version of this document is an uncontrolled copy
© 2023 Unex Technology Corporation – Company Confidential
It is possible for a good active antenna to be reported OPEN because it consumes less
current than 12 mA (e.g., the bundled EX-33 antenna consumes only 8 mA), or a good
passive antenna to be considered SHORT because it is DC shorted (e.g., a slot antenna).
However, as long as there are more than 4 satellites with enough signal strength (C/N
0
value above 30 dB-Hz), the GNSS is in good state.
The antenna status flag is reported in a proprietary NMEA message:
$PSTMANTENNASTATUS,<status>*<checksum><cr><lf>
where
<status>
can be:
•
0 - The antenna current is in the normal range (NORMAL)
•
1 - The antenna current is below the normal range (OPEN)
•
2 - The antenna current is above the normal range (SHORT)
Table 6: GNSS antenna status
Antenna
Status
Current
Consumption (mA)
3.3V bias
NMEA Sentence
OPEN
< 12
ON
$PSTMANTENNASTATUS,1*4C
NORMAL
between 12- 58
ON
$PSTMANTENNASTATUS,0*4D
SHORT
> 58
Turned OFF once triggered
$PSTMANTENNASTATUS,2*4F
9.
Accessories
9.1.
GORE
®
Vent
A GORE
®
Vent is pre-installed to continuously equalize the pressure inside the RSU
enclosure with the atmosphere, while the PTFE membrane prevents the water and dust
ingress at the same time. This vent manages common outdoor weather conditions such as
precipitation or condensation, and as a result, it increases the service life of the RSU.
Figure 8. The GORE
®
Vent
GORE
®
Vent
