Filter
Top Products
5-6 Acutime 2000 Synchronization Kit User Guide
System Operation
5
5.2.3 PPS Output Options
The PPS (Pulse Per Second) output is the primary timing output
generated by the Acutime 2000. In all configurations of the product,
the PPS output is provided through a RS-422 differential driver.
Although using a RS-422 differential receiver to receive the PPS
provides the best noise immunity, you can use just one side of the
differential signal for single-ended applications.
You can program the characteristics of the PPS output using TSIP
packets. Packet 0x8E-4A allows you to enable or disable (turn it on or
off), control the polarity, select the time base (GPS or UTC) and set
the offset (control the cable delay compensation) of the PPS output.
Packet 0x8E-4E allows you to set an accuracy criterion for the
generation of the PPS signal based on the number of usable satellites.
The accuracy of the PPS output depends to some degree on the
number of satellites used in the solution that determine the placement
of the PPS output. In some systems, it is preferable to have the PPS
generated only when it meets the highest levels of accuracy and to
leave it off if these accuracy levels are not met. Packet 0x8E-4F
allows you to select the width of the PPS output from 10 us to 500 ms.
!
Note – For a complete description of the packets described here, see
Appendix A, Trimble Standard Interface Protocol.