V A L A V I O N I C S L T D
C O M 2 0 0 0 – V H F T R A N S C E I V E R
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
Revision 3
Page 21 of 31
March 2013
9
Appendix E –
RS-232 Command Interface
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. For improved compatibility,
the COM 2000 / COM 2KR accepts all commands for the INS 429 / NAV 2000 / NAV 2KR
9.1
Input Commands
The following input command messages are supported:
•
Request data output
•
Set active COM frequency data from a remote source
•
Set standby COM frequency data from a remote source
•
Set COM Volume and Squelch Level
•
Set COM Mic Gain and Sidetone
9.2
Output Messages
The COM 2000 / COM 2KR output messages include:
•
Reset status
•
Communications Error
•
COM Receiver status
•
COM audio mode
•
COM microcontroller software version
•
COM Volume and Squelch Level
•
COM Mic Gain and Sidetone
9.3
Data Format
The data format for serial communication is:
•
Baud rate
9600
•
Data bits
8
•
Stop bits
1
•
Parity
none
9.4
Default Message Output
At system start when the COM 2000 / COM 2KR is configured to operate in normal mode, the following
messages will be configured for output and the specified rates:
•
COM Receiver status at 1 Hz (low rate)
These default rates can be changed by using the Request Data Output message.
