V A L A V I O N I C S L T D
N A V 2 0 0 0 N A V I G A T I O N S Y S T E M
I N S T A L L A T I O N A N D O P E R A T O R ’ S M A N U A L
Pre-Release Issue
Page 20 of 29
Sept. 2013
8
Appendix D –
RS-232 Instruction Listing
This appendix includes the interface specifications for the RS-232 serial port. The RS-232 port can
be used to input active and standby frequencies as well as using an external serial resolver such as an
EFIS system. The interface format conforms to NMEA 0183 message format specifications.
8.1 Input Commands
The following input command messages are supported:
•
Input VOR frequency data from a remote source
•
Input Localizer frequency data from a remote source
•
Request data output
•
Set active VOR/LOC frequency data from a remote source
•
Set standby VOR/LOC frequency data from a remote source
•
Set Omni-Bering Select (OBS) value from remote source
8.2 Output Messages
The NAV 2000 output messages include:
•
Reset status
•
CDI, GSI, and flags
•
Decoded OBS setting
•
Radial from active VOR
•
Communications Error
•
NAV Receiver status
•
NAV audio mode
•
NAV microcontroller software version
8.3 Data Format
The data format for serial communication is:
•
Baud rate
9600
•
Data bits
8
•
Stop bits
1
•
Parity
none
8.4 Default Message Output
At system start when the NAV 2000 is configured to operate in normal mode, the following
messages will be configured for output and the specified rates:
•
CDI, VDI, and Flags at 10 Hz (high rate)
•
Decoded OBS Setting at 10 Hz (high rate)
•
Radial from Active VOR at 10 Hz (high rate)
•
NAV Receiver status at 1 Hz (low rate)
These default rates can be changed by using the Request Data Output message.
