RCB-F9T - Integration manual
When enabled if the ANT-DETECT pin is high the antenna is assumed to be connected under
nominal current and voltage conditions.
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
(OD indicates open circuit detection enabled)
If ANT_DETECT is pulled low to indicate no antenna:-
A
$GNTXT,01,01,02,ANTSTATUS=OPEN*35
is issued
If ANT_DETECT is left floating or is pulled high to indicate antenna connection:
A
$GNTXT,01,01,02,ANTSTATUS=OK*25
is issued
3.8 Multiple GNSS assistance (MGA)
The u-blox AssistNow services provide a proprietary implementation of an A-GNSS protocol
compatible with u-blox GNSS receivers.
The MGA services consist of AssistNow Online and Offline variants delivered by HTTP or HTTPS
protocol. AssistNow Online optionally provides immediate satellite ephemerides, health information
and time aiding data suitable for GNSS receiver systems with direct internet access.
When a client device makes an AssistNow request, the service responds with the requested data
using standard UBX protocol MGA messages. These messages are ready for direct transmission
from the client to the receiver port without requiring any modification.
3.8.1 Authorization
To use the AssistNow services, customers will need to obtain an authorization token from u-blox. Go
to https://www.u-blox.com/en/solution/services/assistnow or contact your local technical support
to get more information and to request access to the service.
3.8.2 Preserving MGA and operational data during power-off
The time-to-fix after a receiver power interruption is dependent on the amount of operational data
available at start-up. Satellite broadcast information plus an estimate of accurate time can be
fetched form the AssistNow service. In addition, the following techniques can restore previously
stored data prior to power down.
•
Save-on-shutdown:
The receiver can be instructed to dump its current state to flash memory
as part of the shutdown procedure; this data is then automatically retrieved when the receiver
is restarted. For more information, see section
for more info. For
information on the UBX-UPD-SOS messages consult the applicable interface description [
].
•
Database dump:
The receiver can be made to dump the state of its navigation database in the
form of a sequence of UBX messages reported to the host; these messages can be stored by
the host and then sent back to the receiver when it has been restarted. See the description of
the UBX-MGA-DBD messages in the applicable interface description [
] for more information.
UBX-22004121 - R01
3 Receiver functionality
Page 29 of 64
C1-Public
Early production information
