Meinberg TCG510 - Manual (Page 14)

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RS232-output
The received time-telegram is transmitted by the TGV510. In this way the loss of the
RS232-interface of the clock for time-code-generation is avoided. Baud rate and framing
of the telegram are the same as the received one ( time string once a second).
Status-LED
The LED indicates the status of the time-code-generator. If it is switched on, the code is
synchronous to the GPS167- or PZF509-time. A flashing LED signalizes that the
internal time pattern correction has not settled.
Firmware Updates
Whenever the on-board software must be upgraded or modified, the new firmware can
be downloaded to the internal flash memory via the serial port COM0. There is no need
to open the metal case and insert a new EPROM.
If the pin '/BSL in' at the VG-connector is held in the TTL-low state while the system
is powered up, a bootstrap-loader is actived and waits for instructions from the serial port
COM0. The new firmware can be sent to TGV510 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 in' input is in TTL-low state
unintentionally while the system is powered up, the firmware will not be changed
accidentially. After the next power-up, the system will be ready to operate again.