Garmin GDL 90 Installation Manual page 37

2.8.5.6 429 Traffic Standby/Operational Input
P2-3 429 Traffic Stby/Op Input
This input discrete controls the Standby/Operational mode of the 429 traffic interface.
2.8.6 Serial Interfaces
2.8.6.1 RS-232 / RS-422
The GDL 90 provides two bi-directional RS-232 serial interfaces, up to two receive-only RS-232 serial
interfaces, and one bi-directional RS-422 serial interface for making optional connections. The serial
ports can be used for connecting to:
Display
External UAT control panel or Transponder
Altitude Encoder
Maintenance PC
P1-3 RS232 RxD1 (Maintenance PC only)
P1-4 RS232 TxD1 (Maintenance PC only)
P1-11 Serial Ground 1
P1-12 RS232 RxD2
P1-13 RS232 TxD2
P1-5 Serial Ground 2
P2-10 RS422 RxD3 +
P2-28 RS422 RxD3 –
P2-11 RS422 TxD3 +
P2-29 RS422 TxD3 –
In order for a serial port to function correctly, the baud rate of the Rx and Tx channels on
a given port must be the same. This must be considered when assigning serial ports to
interfacing equipment.
The two receive-only serial ports (RxD6 and RxD7) are shared with ARINC 429 Input 1.
If ARINC 429 Input 1 is used, then RxD6 and RxD7 are not available.
GDL 90 Installation Manual
P2-15
P2-7
P2-33
P2-24
NOTE
NOTE
560-1049-02 Rev. B
Installation Procedures
429 IN 1A / RS232 RxD7
Serial Ground 7
429 IN 1B / RS232 RxD6
Serial Ground 6
2-19