Garmin GMA 347 Installation Manual page 45

4.3.3 RS 232 Serial Input/Output
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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. The RS-232 IN/OUT 1 connections are used to upload configuration
data into the unit. The unit is configured out of the aircraft, before final installation. Refer to Section 5
for configuration instructions.
Figure 4-3. GMA 347 Configuration Upload Connections
GMA 347 Installation Manual
190-00325-01
Table 4-5. RS-232 Pin Assignments, J3472
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 I/O
Out
In
Out
In
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