Serial Data Electrical Characteristics - Garmin GRS 77 Installation Manual

4.3

Serial Data Electrical Characteristics

4.3.1 RS-232 Input/Output
Table 4-4. RS-232 Pin Assignments, P771 and P441
Pin
P771-11 GPS 1 RS-232 IN
P771-6 GPS 2 RS-232 IN
P771-8 SPARE RS-232 IN 1
P771-26 GPS 1 RS-232 OUT
P771-21 GPS 2 RS-232 OUT
P771-23 SPARE RS-232 OUT 1
P771-10 MAGNETOMETER RS-232 OUT
P441-8 RS-232 IN
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 Figures B-1 and B-2 in Appendix B for the RS-232 serial data
interconnections.
4.3.2 RS-485 Input/Output
Table 4-5. RS-485 Pin Assignments, P771 and P441
Pin
P771-39 MAGNETOMETER RS-485 IN B
P771-25 MAGNETOMETER RS-485 IN A
P771-40 MAGNETOMETER GROUND
P441-4 RS-485 OUT A
P441-2 RS-485 OUT B
Page 4-4
Revision L
Pin Name
Pin Name
Description
Data In
Data In
Data In
Data Out
Data Out
Data Out
Data Out
Data In
Description
Data In
Data In
Ground
Data Out
Data Out
GRS 77/GMU 44 Installation Manual
I/O
In
In
In
Out
Out
Out
Out
In
I/O
In
In
--
Out
Out
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