u-blox ZED-F9P Integration Manual page 77

Result:
• MON-RF in u-center: Antenna status = OK. Antenna power status = ON
• ANT_OFF = active high to disable an external antenna therefore the pin is low to enable an
external antenna.
• ANT_SHORT_N = active low to detect a short therefore the pin is high (pio pull up enabled to be
pulled low if shorted)
Start up message at power up if configuration is stored:
$GNTXT,01,01,02,ANTSUPERV=AC SD *37
$GNTXT,01,01,02,ANTSTATUS=INIT*3B
$GNTXT,01,01,02,ANTSTATUS=OK*25
ANTSUPERV=AC SD (Antenna control and short detection activated)
Then if shorted (ANT_SHORT_N pulled low)
• MON-RF in u-center: Antenna status = SHORT. Antenna power status = ON (Antenna power
control powerdown when short has not been enabled = off by default)
• $GNTXT,01,01,02,ANTSTATUS=SHORT*73
• ANT_OFF = active high therefore still low (still enabled as auto power down is not enabled)
Power off and on required to clear short condition report. Or turn feature off an on again.
5.3.10.3 Antenna short detection auto recovery
Then to set automatic recovery from short state:
CFG-HW-ANT_CFG_RECOVER = 1
Result..
• MON-RF in u-center: Antenna status = OK. Antenna power status = ON
• ANT_OFF = active high there for the pio is low to enable an external antenna
• ANT_SHORT_N = high (pio pull up enabled to be pulled low if shorted)
Start up message at power up if config stored:
$GNTXT,01,01,02,ANTSUPERV=AC SD PDoS SR*3E
$GNTXT,01,01,02,ANTSTATUS=INIT*3B
$GNTXT,01,01,02,ANTSTATUS=OK*25
ANTSUPERV=AC SD PDoS SR (indicates short circuit recovery added - SR)
Then if antenna is shorted (ANT_SHORT_N pulled low):
• $GNTXT,01,01,02,ANTSTATUS=SHORT*73
• MON-RF in u-center: 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
MON-RF in u-center: Antenna status = OK. Antenna power status = ON
5.3.10.4 Antenna open circuit detection - ANT_DETECT
Then to set antenna open circuit detect:
UBX-18010802 - R02
Advance Information
5 Hardware description
ZED-F9P - Integration Manual
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