MAX-7 / NEO-7 - Hardware Integration Manual
UBX-13003704
-
R09
Production Information
Design
Page
26 of 52
No
Super-
vision
Active
Antenna
OK
Open
Circuit
detected
Short
Circuit
detected
Powerup
Events AADET0_N
User controlled events
Disable Supervision
Enable Supervision
Short Circuit
detected
Disable
Supervision
Antenna
connected
Short Circuit
detected
open circuit
detected, given
OCD enabled
Periodic
reconnection
attempts
Figure 21: State diagram of active antenna supervisor
The module firmware supports an active antenna supervisor circuit, which is connected to the
AADET_N
pin. For
an example of an open circuit detection circuit, see Figure 24. High on pin
AADET_N
means that an external
antenna is not connected.
3.4.3.1
Status reporting
At startup, and on every change of the antenna supervisor configuration, the u-blox 7 GPS/GALILEO module will
output an NMEA
($GPTXT
) or UBX (
INF-NOTICE
) message with the internal status of the antenna supervisor
(disabled, short detection only, enabled).
None, one or several of the strings below are part of this message to inform about the status of the active
antenna supervisor circuitry (e.g. “
ANTSUPERV= AC SD OD PdoS
”).
Abbreviation
Description
AC
Antenna Control (e.g. the antenna will be switched on/ off controlled by the GPS receiver)
SD
Short Circuit Detection Enabled
SR
Short Circuit Recovery Enabled
OD
Open Circuit Detection Enabled
PdoS
Power Down on short
Table 6: Active Antenna Supervisor Message on startup (UBX binary protocol)
To activate the antenna supervisor use the UBX-CFG-ANT message. For further information, refer to the
u-blox 7 Receiver Description Including Protocol Specification
Similar to the antenna supervisor configuration, the status of the antenna supervisor will be reported in an
NMEA (
$GPTXT
) or UBX (
INF-NOTICE
) message at start-up and on every change.
