VAL Avionics NAV 2000 Operator's Manual download pdf (Page 20)

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.

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VAL Avionics NAV 2000 Operator's Manual Page 20