4.2 Pulse outputs
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The internal system clock is always set to the received
IRIG time, which might have a local oset to UTC. Only
if TCR511PEX is congured with this oset, Meinberg
driver software is able to set the system time of the
computer correctly. The serial interface COM0 can
send the Standard Meinberg Timestring with UTC or
local (IRIG) time.
IRIG telegrams don't include announcers for the change
of time zone (daylight saving on/o) or for the insertion
of a leap second. Hence the clock will switch into free-
wheeling mode in case of such event, and resynchronize
afterwards.
The board TCR511PCI decodes the following formats:
A133:
1000pps, amplitude modulated sine wave signal, 10 kHz carrier frequency
BCD time of year, SBS time of day
A132:
1000pps, amplitude modulated sine wave signal, 10 kHz carrier frequency
BCD time of year
A003:
1000pps, DC Level Shift pulse width coded, no carrier
BCD time of year, SBS time of day
A002:
1000pps, DC Level Shift pulse width coded, no carrier
BCD time of year
B123:
100pps, amplitude modulated sine wave signal, 1 kHz carrier frequency
BCD time of year, SBS time of day
B122:
100pps, amplitude modulated sine wave signal, 1 kHz carrier frequency
BCD time of year
B003:
100pps,DC Level Shift pulse width coded, no carrier
BCD time of year, SBS time of day
B002:
100pps, DC Level Shift pulse width coded, no carrier
BCD time of year
AFNOR NFS 87-500: 100pps, amplitude modulated sine wave signal, 1 kHz carrier frequency
BCD time of year, complete date, SBS time of day
4.2 Pulse outputs
The module TCR511PCI generates pulses at change of second (PPS) and change of minute (PPM). The PPS
signal is available with TTL (0/+5V) or RS-232 (-3..12V/ +3..12V) level, the PPM signal with TTL level only.
If required, DIP-switches can be set up to direct the pulses to a corresponding pin of the D-Sub-connector in the
bracket.
4.3 Asynchronous serial port
TCR511PCI provides an asynchronous serial interface (RS-232) called COM0. The serial port sends a Standard
Meinberg Time string either once per second, once per minute or on request with ASCII `?' only. The format of
this telegram is described in the `Technical Specications'. The transmission speed and the framing can be set
via the PCI-Express bus by using the shipped monitor software. Furthermore, the serial interface COM0 is used
for a potential rmware update.
TCR511PCI
Date: 2009-06-24
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