14
P2
9-way ‘D’ Type
Connector, Female
P1
9-way ‘D’ Type
Connector, Female
Screen
GRND
TX_D 3
5
2RX_D
5GRND
RED
BLUE
DAU RS232
Serial Port
Tel efault
COM1
DAU RS232 Port to Telefault GPS Cable (16-2017)
The DAU to which this pulse is connected will be the Time
Master DAU.
This Time Master DAU may now be used to provide time
synchronisation to other DAUs, using the RS485 pps connection
described previously.
Using NGTS
NGTS is the definition for a serial time code format and a
device providing this serial time code data format may be
connected to a serial port of an IDM DAU.
The serial connection to the DAU is as detailed below.
DAU COM
PORT
DESCRIPTION
Pin 2 RS232 serial data to DAU
Pin 5 Serial data grnd
.
If the NGTS device is a Telefault GPS from Qualitrol
Hathaway, then connection to COM1 on the Telefault GPS is
made via Qualitrol Hathaway cable 16-2017 and its details are
shown below.
Note:
If using DAU COM2, jumpers J3 and J4 on the CPU
board must be in position A and J8 must be in
position B. Additionally on the Analog board, J2 must
be in position A.
Using NGTS with PPS
The NGTS standard, in addition to the serial time code packet,
defines a pulse per minute epoch marker. This pulse is too
infrequent and cannot be used by the DAU (the DAU requires a
pulse per second). Thus, connection of only the NGTS serial
time code packet to a DAU will prevent time errors due to drift,
as a NGTS serial time code packet is issued every minute, but
accuracy to absolute time may be deviant by up to half a second
worst case.
If a pulse per second is available, this should be connected to
the DAU, in addition to the NTGS serial time. The Telefault
GPS manufactured by Qualitrol Hathaway provides a pulse per
second output and this pulse (or equivalent) may be connected
to a DAU as detailed in the table below.
DAU PPS
BNC
DESCRIPTION
Inner Pulse signal
Outer Pulse signal grnd.
Caution!
For successful clock synchronisation, the configuration
of the DAU in Replay
™
Plus must be made to match the
physical installation.
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