User Manual

SGD-SB2025NT-TUM, Part 2
Jan 12 Page 75 DIAGNOSTICS
9 DIAGNOSTICS AND OTHER INFORMATION
9.1 GPS
If a GPS Rx is used to provide the 1PPS timing signal, it is likely that NMEA data will also be
supplied. Information is taken from the NMEA data stream about the GPS Rx and displayed on the
satellite signal report page. The ‘GPS’ button on the NI ET and the TM ET provides access to this
page, which is designed to assist in the installation and any subsequent diagnostics of the GPS
Rx. The page is identical in look and operation for both types of ET. Whilst part of the equipment
configuration is to define whether or not NMEA data is present (see Section 5.3.2.2 – GPS
Module ), the information will always be displayed when NMEA data is connected, i.e. irrespective
of the setup configuration.
Figure 66. Satellite Signal Report.
With the exception of the ‘PPS Fix’ indication, the indicators will flash Green / Yellow to confirm
correct operation. If all indications remain Grey then no data is being received and further
investigation will be required.
The “string” information may differ with early models of GPS Rxs:
Figure 67. GPS Options menu.
Through the ‘Options’ menu it is possible to use Universal Time Coordinated (UTC) time from the
GPS Rx to ‘Set PC Clock’ of the PC running the ET application. This automatically takes into
account the world time zone setting of the PC. The other option is to ‘Close’ the GPS page.
9.2 F ACILITY K EY
The ‘Facility Key’ is a hardware element of the TM programmed and fitted in the factory that
determines the options available. Correct operation of the ‘Facility Key’ is indicated in the area of
the TM Status panel (part shown below).