Garmin GNS 480 Installation Manual page 63

P1-4 RS232 RxD1
P1-5 RS232 TxD1
P1-23 Serial Ground 1
P1-21 RS232 RxD2
P1-22 RS232 TxD2
P1-3 Serial Ground 2
P1-7 RS232 RxD3
P1-6 RS232 TxD3
P1-25 Serial Ground 3
P1-11 RS422 RxD4 +
P1-26 RS422 RxD4 –
P1-8 RS422 TxD4 +
P1-10 RS422 TxD4 –
In order for a serial port to function correctly, the baud rate of the Rx and Tx channels on
a given RS232 or RS422 port must be the same. This must be considered when
assigning serial ports to interfacing equipment.
The GNS 480 can communicate with an SL30 radio using RS232 RxD1 and TxD1. This interface allows
the SL30 to provide DME station information to the GNS 480, which will provide the range to the DME
station back to the SL30 for display on its front panel.
The GNS 480 can communicate with a PDA using the infrared sensor on the front bezel. If this feature is
used it must be set up on RxD3 and TxD3, not allowing these lines to be used for communication with
other devices.
The GNS 480 can receive air data and fuel data from certain systems on RS232 RxD5, although it is
recommended that if a dedicated altitude encoder is used, it be connected to RS232 RxD8.
If two GNS 480's are installed in an aircraft, the RS232 RxD2 and TxD2 lines may be cross connected to
cross-fill flight plans and user-defined waypoints from one GNS 480 to the other (this feature is not
implemented in the initial version of the GNS 480). Altitude data and master/slave control is coordinated
between two GNS 480's.
The GNS 480 can communicate with an SL70 or SL70R transponder using the RS232 RxD6 and TxD6
lines, allowing the GNS 480 to control the operation of the transponder. This interface will also allow
altitude to be provided from the SL70/70R to the GNS 480. RS232 channel 6 is opto-isolated, allowing
the transmit lines of two GNS 480's to be connected together to either GNS 480 to control an SL70
transponder.
A dedicated altitude encoder may be used to provide altitude data to the GNS 480 using RS232 RxD8.
The GNS 480 can provide DME tuning data to the DB30 using a reserved transmit port. This reserved
output cannot be configured.
Refer to section 3.2.1.1 for a list of available serial port configurations, and information on configuring
the serial ports.
GNS 480 (CNX80) Installation Manual560-0982-01 Rev A
P5-1 RS232 RxD5
P5-21 RS232 TxD5
P5-41 Serial Ground 5
P5-2 RS232 RxD6
P5-22 RS232 TxD6
P5-42 Serial Ground 6
P5-10 RS232 RxD7
P5-30 RS232 RxD8
P5-44 Serial Ground 7/8
P7-5 RESERVED DB30 TxD
P7-3 Ground
NOTE
Installation Procedures
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