Garmin Apollo CNX80, Installation Manual

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Appendix B - Serial Interface Specifications
Apollo CNX80 Installation Manual 560-0982-00 Rev D B-1
APPENDIX B - S
ERIAL
I
NTERFACE
S
PECIFICATIONS
This appendix includes the RS232 serial port interface specifications.
The RS-232 serial interface configurations supported by the CNX80 are described below. Instructions for
configuring the serial port are included in the checkout procedure in section 3.2.1.1. Serial output
connections should be limited to a maximum of three external units.
B.1 S
ERIAL
I
NPUT
S
PECIFICATIONS
Available settings for the serial inputs are listed in Figure 3-2. Not all settings are available on each serial
input port – refer to section 3.2.1.1 to determine which settings are available on a given port.
Table B- 1 - RS-232 Serial Input (RX) Selections
RX Comment Reference
N
ONE
No input connected. N/A
MAPMX Proprietary interface between CNX80 and MX20 v5.0 or later.
This interface will support auto chart selection, flight plans,
zoom scale matching, altimeter correction, and ILS and VOR
navigation information. (MUST BE USED WITH MAPMX
SELECTED ON SAME OUTPUT PORT) N/A
CNX80 Proprietary interface to second CNX80 for cross-talking data
(MUST BE USED WITH CNX80 SELECTED ON SAME
OUTPUT PORT) N/A
A
LT
E
NC
Altitude encoder data. B.1.1
FADC Fuel/Air Data Computer data. B.1.2
SL30 Tuned Nav station data.
Refer to SL30 installation manual. 560-0404-xx
SL70 SL70/SL70R mode control and altitude data.
Refer to SL70 installation manual. 560-0402-xx
I
R
DA Not currently supported. N/A
B.1.1 Altitude Encoder/Converter Input
The format of the altitude input is as follows. Definition of the input message is included in Table B- 2.
Several sample messages are illustrated in Figure B- 1.
Baud rate: .............................................1200/9600
Data bits: ..............................................8
Stop bits: ...............................................1
Parity: ...................................................none
Expected input rate: ...............................approx. 1 second
Message length: .....................................17 characters