ZED-F9T-Integration Manual
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
3.3.9.4 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: 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
3.3.10 EXTINT
EXTINT is an external interrupt pin with fixed input voltage thresholds with respect to VCC. It can
be used for functions such as accurate external frequency aiding and ON/OFF control. Leave open
if unused, this function is disabled by default.
3.3.11 Communication ports
u-blox receivers are enabled with a highly flexible communication interface. It supports a variety
of protocols, and is truly multi-port and multi-protocol capable. See Interface Description for the
supported protocols. Each protocol can be enabled on several ports at the same time (multi-port
capability) with individual settings (e.g. baud rate, message rates, etc.) for each port. Furthermore,
more than one protocols can be enabled on a single port at the same time (multi-protocol capability).
Port # Electrical interface
0 DDC
(I²C
compatible)
1 UART1
2 UART2
3 USB
4 SPI
Table 15: Port number assignment
The following table shows the port numbers reported in the UBX-MON-COMMS message.
UBX-19005590 - R01
3 Receiver functionality Page 28 of 80
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