SYSTEM INSTALLATION MANUAL
89000016
I.
Time Mark I/O (PPS)
(1)
The time mark I/O is an RS-422 differential pair conforming to the ARINC 743 A/B specification
for the one PPS input from an external GPS or output when the KGX has an internal GPS. The
time mark I/O from a GPS provides the timing synchronization for sending ADS-B messages.
NOTE:
The time mark from a GPS provides timing synchronization for ADS-B transmit
messages. The time mark from an external GPS must be synchronized to UTC
second epoch to operate correctly with the KGX.
NOTE:
Time mark inputs from a single ended PPS source (i.e., GPS) must be properly
interfaced to the differential interface for reliable operation.
(2)
The time mark input/output pin connections are shown in Table 1019.
Table 1019. Time Mark Input
Pin
Signal
Electrical
I/O
Description
J1-39
PPS IO+
ARINC 743 A/B
I/O
Internal/external GPS PPS out/in+
J1-40
PPS IO-
ARINC 743 A/B
I/O
Internal/external GPS PPS out/in-
J.
Maintenance Port Interface
(1)
The MPI can be used to configure the system, supply installation status information, and
update system software/firmware. The MPI must be used by qualified installation personnel to
configure and update the system.
(2)
The MPI functionality is provided through serial Port 3 or serial Port 5 (preferred) on the
KGX series DB-44 connector. A female DB-9 connector can be mounted in the aircraft
for convenient MPI access to a standard RS-232 interface meeting the specifications of
TIA/EIA-232-F, Interface Between DTE and DCE Employing Serial Binary Data Interchange.
(3)
If both Port 3 and Port 5 are configured and connected to other aircraft equipment, the MPI
can still be accessed if the configured device is not actively connected. Therefore, an inline
connector can be installed between the devices and used to temporarily disconnect the
configured device and permit external MPI access.
(4)
Figure 1005 shows an example of Port 5 connecting to a standard female DB-9 (DE-9F)
RS-232 connector as an inline connection or dedicated MPI port. This allows any other
standard RS-232 device to communicate with the KGX.
Figure 1005. (Sheet 1 of 1) Inline MPI Connector and Compatible MPI Devices
EFFECTIVITY
ALL
Page 1017
22 Dec 2016
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