Serial Datagram - GE Reason RT430 Technical Manual

Charter 6 – Configuration

Serial datagram

RT430/434
For each electrical, optical, open collector and serial output, it is possible to configure
the following signals:

OFF - Output turned off;

PPS - Output with 1 pulse-per-second;

100PPS - Output with 100 pulses-per-second;

PPX - Output with programmable frequency pulses;

PPM - Output with 1 pulse-per-minute;

TMARK - Output with programmable time;

DMARK - Output with programmable date and time;

IRIG-B - Output with IRIG-B004 signal;

DCF77 - Output with DCF77 signal.
It is also possible to choose normal or inverted polarity for each output individually.

The field TMARK allows configuring time to generate a pulse with daily
repetition. All outputs programmed to send TMARK pulses will be programmed
within the same time.

The field DMARK allow to set a date and time for a single pulse signal. All
outputs using DMARK will be programmed to this same date and time.

The field PPX allows configuring a pulse-frequency that can vary from 1 pulse-
every-2-seconds to 1 pulse-per-day. All outputs programmed to send PPX
pulses will be programmed within the same pulse-frequency.

The field Pulse Width allows the user to adjust the duty cycle (pulse width of
high state) for PPS, PPM, PPX, TMARK and DMARK.

Pulse width of 1µs when unlocked: When selected, this option turns the PPS,
PPM, PPX, TMARK and DMARK pulses into a 1µs pulse when not locked to
satellites, indicating that the synchronization signal is local, not global.

Disable PPS when unlock time after (s): When selected, this option disables the
PPS signal after the specified time, in seconds.

The field Cable delay compensation allows entering a value between 0 and 999
nanoseconds (ns) to compensate propagation delay according to the cable
length. Refer to Appendix D for more details of how to compensate the cable
delay.

The field Datagram allows configuring a datagram sent by the serial port (TDx
pin).

ACEB, NEMEA, GPZDA, Meinberg and customizable datagrams are possible.
When choosing a customizable datagram, it is necessary to enter characters
with information required. For more details about ACEB, NEMEA, GPZDA and
Meinberg datagrams, see Appendix C;

A serial datagram is sent each second. The field On-time mark allows choosing
if the sending will be synchronized with the beginning or the end of the
datagram;
Start of first: pulse synchronized with the beginning of the
o
datagram;
Start of last: pulse synchronized with the end of the datagram;
o

Serial: allows configuring the serial port parameters.
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