190-01639-00 GSU 75 ADAHRS Installation Manual
Rev. 6 Page 4-9
4.7 GSU 75 ARINC 429 System ID Connections
The GSU 75 has an associated Source/Destination Identifier (SDI or System ID) that is coded into its
ARINC 429 output messages/labels. The System ID may be used to uniquely distinguish the source of the
GSU 75 ARINC 429 labels in a system with more than one GSU 75. The GSU 75 System ID can be set to
All Call, #1, or #2 for such purposes.
By hard strapping the program pins to ground or open, the GSU 75 is assigned a System ID. The System
ID is included in each transmitted ARINC 429 word. The System ID indicates there is only a single ADC
installed (All Call) or, if multiple units are installed, which ADC the data originates from (#1 or #2). When
a single GSU 75 is installed in the system, then the pins are left open (All Call).
4.8 GSU 75 System ID Inputs
The system ID is determined by configuring the Sys ID pins per Table 4-16.
Table 4-15. GSU 75 ARINC 429 System ID Connections
Pin Name Pin I/O
ADC SYSTEM ID PROGRAM 1* 75 In
ADC SYSTEM ID PROGRAM 2* 57 In
Table 4-16 GSU 75 System ID Inputs
SYSTEM ID 1 (pin 75) SYSTEM ID 2 (pin 57) UNIT NUMBER
Open Open All Call
Ground Open #1
Open Ground #2
Ground Ground N/A, Do Not Ground Both Pins
The document reference is online, please check the correspondence between the online documentation and the printed version.
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