Garmin GNC 420 Maintenance Manual page 155

B.3.3 J9
Pin Name
12V
5V_NAV
GND
-12V
VLOC_SERIAL_IN
KEY
G/S_SERIAL_IN
G/S_SERIAL_OUT
NAV_VOL_CONTROL
VLOC_SERIAL_OUT
B.3.4 J11
Pin Name
12V_COM
-12V_COM
5V_COM
COM_SERIAL_IN
COM_SERIAL_OUT
COM_VOL_CONTROL
Not used.
Not used.
GND
GND
400 SERIES MAINTENANCE MANUAL
P/N 190-00140-05
Table B-5. J9 Descriptions
Pin # I/O
1 O 12 volt Supply to NAV board and G/S board from Main CPU board.
2 O +5 volt Supply to NAV board and G/S board from Main CPU board.
3 O Ground.
4 O -12 volt Supply to NAV board and G/S board from Main CPU board.
5 O Serial output used to communicate with the processor on the NAV
board.
6 -
7 O Serial output used to communicate with the processor on the G/S
board.
8 I Serial input used to communicate with the processor on G/S board.
9 O This is a dc output that is connected to the center tap of a pot. See
J14-41 (POT_BOT_WPR).
10 I Serial input used to communicate with the processor on NAV board.
Table B-6. J11 Descriptions
Pin # I/O
1 O 12 volt Supply to COM board from Main CPU board.
2 O -12 volt Supply to COM board from Main CPU board.
3 O +5 volt Supply to COM board from Main CPU board.
4 O Serial output used to communicate with the COM board.
5 I Serial input used to communicate with the COM board.
6 O This is a dc output that is connected to the center tap of the
volume pot. See J14-70 (POT_TOP_WPR).
7
8
9 O Ground.
10 O Ground.
Description
Description
Page B-5
Rev. C