Installation manual

Serial Interface Specifications

Apollo SL30 Installation Manual

APPENDIX E - SERIAL INTERFACE SPECIFICATIONS

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, and is used to input frequencies from a

remote source, such as the SL50/60 and 2001 GPS. The interface format conforms to NMEA

0183 message format specifications.

INPUT COMMANDS

The following input command messages are supported:

• Input airport identifier associated with remote Comm frequency list

• Input Comm frequency data from a remote source

• Input VOR frequency data from a remote source

• End of VOR frequency list from a remote source

• Start of Localizer frequency list 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 standby COMM frequency data from remote source

• Set NAV audio mode

• Set Omni-Bearing Select (OBS) value from remote source

• DME sensor input

OUTPUT MESSAGES

SL30 output messages include:

• Reset status

• CDI, GSI, and flags

• Decoded OBS setting

• Radial from active VOR

• Radial from standby VOR

• Decoded station identifier

• Communications error

• Receiver status

• NAV audio mode

• NAV microcontroller software version

• NAV DSP software version

• Comm transceiver status

• Comm software version