10
BSL Key
Whenever the on-board software must be upgraded or modified, the new firmware
can be downloaded to the internal flash memory using the serial port COM0. There is
no need to open the metal case and insert a new EPROM.
If the BSL key behind the front panel is pressed during operation, a bootstrap-
loader is actived and waits for instructions from the serial port COM0. The new
firmware can be sent to GPS161AHS from any standard PC with serial interface. A
loader program will be shipped together with the file containing the image of the new
firmware.
The contents of the program memory will not be modified until the loader program
has sent the command to erase the flash memory. So, if the BSL key is pressed
unintentionally, the firmware will not be changed accidentially. After the next
power-up, the system will be ready to operate again.
BNC connector GPS Ant
The antenna/converter unit is connected to the receiver circuit of the GPS161AHS
through this connector.
Assignment of the DSUB connector
The serial port COM0 is accessible via a nine-pole female DSUB connector in the
frontpanel. This RS-232 interface can be connected to a computer by using a standard
modem cable. TxD describes the sending, RxD the receiving line of GPS161AHS.
Содержание GPS161AHS
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