ZED-F9P-Integration manual
Then if antenna is shorted (ANT_SHORT_N pulled low):
•
$GNTXT,01,01,02,ANTSTATUS=SHORT*73
• UBX-MON-RF in u-center "Message View": Antenna status = SHORT. Antenna power status =
OFF
• ANT_OFF = high (to disable - active high)
After a time out period receiver will re-test the short condition by enabling ANT_OFF = LOW
If a short is not present it will report antenna condition is OK:
$GNTXT,01,01,02,ANTSTATUS=OK*25
UBX-MON-RF in u-center "Message View": Antenna status = OK. Antenna power status = ON
3.8.4 Antenna open circuit detection - ANT_DETECT
Enable the antenna open circuit detection by setting the configuration item CFG-HW-
ANT_CFG_OPENDET to true (1).
Result:
• UBX-MON-RF in u-center "Message View": Antenna status = OK. Antenna power status = ON
• ANT_OFF = active high therefore PIO is low to enable external antenna
• ANT_SHORT_N = active low therefore PIO is high (PIO pull up enabled to be pulled low if
shorted)
• ANT_DETECT = active high therefore PIO is high (PIO pull up enabled to be pulled low if antenna
not detected)
Start-up message at power up if configuration is stored:
$GNTXT,01,01,02,ANTSUPERV=AC SD OD PDoS SR*15
$GNTXT,01,01,02,ANTSTATUS=INIT*3B
$GNTXT,01,01,02,ANTSTATUS=OK*25
ANTSUPERV=AC SD OD PDoS SR (indicates open circuit detection added - OD)
Then if ANT_DETECT is pulled low to indicate no antenna:
$GNTXT,01,01,02,ANTSTATUS=OPEN*35
Then if ANT_DETECT is left floating or it is pulled high to indicate antenna connected:
$GNTXT,01,01,02,ANTSTATUS=OK*25
3.9 Multiple GNSS assistance (MGA)
The u-blox MGA services provide a proprietary implementation of an A-GNSS protocol compatible
with u-blox GNSS receivers. When a client device makes an MGA request, the service responds
with the requested data using UBX protocol messages. These messages are ready for direct
transmission to the receiver communication port without requiring any modification by the MGA
client.
Currently, these MGA services consist of AssistNow Online and Offline, each delivered by the HTTP
or HTTPS protocols.
AssistNow Online optionally provides satellite ephemerides, health information and time aiding data
suitable for GNSS receiver systems with direct internet access.
UBX-18010802 - R08
3 Receiver functionality Page 47 of 110
Early production information
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