Garmin 011-01257-20 Manuale di installazione - Pagina 33
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4.3.3 RS-232 Serial Input/Output
Pin
Pin Name
6
RS-232 OUT 1
7
RS-232 IN 1
38
RS-232 OUT 2
39
RS-232 IN 2
The RS-232 outputs conform to EIA/TIA-232C with an output voltage swing of at least ±5 V when
driving a standard RS-232 load. Refer to Figure B-5 for the RS-232 serial data interconnections.
4.3.4 Marker Beacon Functions
Marker Beacon connections are listed in the following table. The antenna input is connected to pins 78
(HI or Center Conductor) and 59 (LO or Shield).
Table 4-6. Marker Beacon Pin Assignments, J3472
Pin
34
MIDDLE MARKER SENSE
AIRWAY/INNER MARKER EXT
74
LAMP OUT (-00)
75
MIDDLE MARKER EXT LAMP OUT
76
OUTER MARKER EXT LAMP OUT
78
MARKER ANTENNA HI
59
MARKER ANTENNA LO
4.3.5 Reversionary Mode
The reversionary mode pins are used in installations having more than one GDU that have a
GMA 1347D. The GMA 1347D contains a display backup button. This button is used to switch the PFD
and MFD display data.
Table 4-7. Reversionary Mode Pin Assignments, J3472
Pin
Pin Name
36
REVERSIONARY MODE 1
REVERSIONARY MODE
37
COMMON 1
56
REVERSIONARY MODE 2
REVERSIONARY MODE
57
COMMON 2
GMA 1347D Installation Manual
190-00303-21
Table 4-5. RS-232 Pin Assignments, J3472
Pin Name
PFD
Ground reference for mode 1
MFD
Ground reference for mode 2
Description
Output level greater than ±5 Volts
Input level up to ±25 volts
Output level greater than ±5 Volts
Input with level up to ±25 volts
Description
2.5-8 Vdc into 4.7 k
MKR I-HI white 2.5-8 Vdc into 56
MKR M-HI amber. 2.5-8 Vdc into
Ω
56
MKR O-HI blue. 2.5-8 Vdc into 56
Marker antenna input, 50
Ground reference for pin 78
Description
connect
connect
Ω
Ω
Ω
Ω
Page 4-7
Revision C
I/O
Out
In
Out
In
I/O
Out
Out
Out
Out
In
--
I/O
Out
--
Out
--