__________________________________________ Appendix A OEM Receivers Electrical Specifications
AsteRx2 Product Family Hardware Manual v2.10.1
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2.
by shortly driving pin#8 (nPOWER_TOGGLE) low as indicated in section A.2.
After having requested to enter stand-by mode, it takes up to 0.5 seconds for the receiver to actually
enter low-power state. This time is required to unmount the SD memory card and stop all software
activities.
Waking up from stand-by mode is done in one of the following ways:
1.
by sending one or more characters to the first serial port (COM1) at a baud rate lower than
4800baud;
2.
by shortly driving pin#8 (nPOWER_TOGGLE) low.
Note that if the receiver has been set in stand-by mode by the command “
exePowerMode,
ScheduledSleep
”, it will wake up automatically after a prescribed amount of time.
A.6
SD Memory Card Usage
The receiver can interface to an external SD memory card through the SPI-related pins of the 80-pin
connector. The recommended circuit to a 9-pin SD memory card socket is shown below. The four SPI
lines connect to pins#61, #62, #63 and #64 of the 80-pin connector.
When using SD memory card logging, please take note of the following:
1.
SDHC cards are not supported on firmware versions prior to 2.3.
2.
The file system (FAT) is intended to not remove the card: the read-out of the data should be
done through the serial or USB interfaces.
3.
To avoid data corruption, the card needs to be correctly unmounted before turning off the
power supply. This can be done in two ways:
a.
By entering the “
exePowerMode, StandBy
” command before turning off the
receiver.
b.
By having a sufficient reserve to power the receiver for at least 0.5 seconds after the
disconnection of the main power (e.g. with capacitors). Using pin#8
(nPWR_TOGGLE), an indication needs to be given that the power will be turned off.
