Meinberg TCR511 - Manual (Page 12)

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Pulse and frequency outputs
The board provides pulses on second and minute changeover ( P_SEC, P_MIN ).
Additionally fixed frequencies at 100kHz, 1MHz and 10MHz are derived from the
master oscillator. Each of these signals is available at TTL Level on the rear panel 64pin
connector.
TIME_SYN-Output
This TTL output can be used to monitor the synchronization state of the board. The
TIME_SYN signal is in high state whenever the clock is synchronized with the applied
IRIG-Code. It shows low state when the applied code cannot be read, the consistency
check fails or a system failure like brown-out or watchdog reset occurs.
Serial Ports
The board provides two indepentently configurable serial ports at RS232 level. Both
serial ports output the Standard Meinberg telegram. Telegrams can either be output
automatically on second changeover or on request ( ASCII char '?' received ). Serial port
COM0 can additionally be used to communicate with the enclosed monitor software. A
firmware update using mbgflash.exe is done via this channel as well.
Status LEDs
The boards state is signalized by two front panel leds. The red FAIL led indicates the free
wheeling mode. It is activated when the board has switched into freewheling mode, and
turned off when the clock is synchronized. The green LOCK led shows the state of the
internal time. LOCK is turned on when the timebase regulation has settled.