Rainbow Aircraft Inc. V10 Manual Do Utilizador
MGL Avionics V10 transceiver binary communications protocol
Version
This document contains preliminary information on the binary communications protocol used
by MGL Avionics VHF airband transceivers. It is applicable to panel mount as well as remote
units that are controlled via passive panels or EFIS systems.
by MGL Avionics VHF airband transceivers. It is applicable to panel mount as well as remote
units that are controlled via passive panels or EFIS systems.
MGL Avionics does not guarantee correctness of this document. MGL Avionics reserves the
right to change any part of the specification at any time.
Please contact MGL Avionics for a current copy of this specification if you intend using it for
your project.
right to change any part of the specification at any time.
Please contact MGL Avionics for a current copy of this specification if you intend using it for
your project.
General
Communications takes place via RS232.
9600 Baud
8 Data bits
1 Stop bit
No parity
8 Data bits
1 Stop bit
No parity
The transceiver transmits regular status messages containing sufficient information to build a
typical display image. The status message is transmitted every 120mS.
Messages to the transceiver consist of commands. Most commands result in transmission of
an acknowledgment when the command has been received with a matching checksum.
Exceptions to this are the PTT command (no response) and the request channel command
which responds with channel data.
PTT command has to be sent every 100 mS to keep PTT active.
typical display image. The status message is transmitted every 120mS.
Messages to the transceiver consist of commands. Most commands result in transmission of
an acknowledgment when the command has been received with a matching checksum.
Exceptions to this are the PTT command (no response) and the request channel command
which responds with channel data.
PTT command has to be sent every 100 mS to keep PTT active.
Command messages containing frequencies that are not within the permitted airband are
ignored and not acknowledged.
ignored and not acknowledged.
Most MGL radios have two RS232 communication links. Both links accept the same protocol
and messages may be sent simultaneously via both links. This allows a redundant
communications link to be established via two EFIS systems. It is recommended that only one
EFIS system controls the transceiver while the other will take control in case the first one has
a failure.
and messages may be sent simultaneously via both links. This allows a redundant
communications link to be established via two EFIS systems. It is recommended that only one
EFIS system controls the transceiver while the other will take control in case the first one has
a failure.
Note: The RS232 links also accept parts of the Garmin SL30 and SL40 communications
protocols. Functions supported are frequency lists and direct selection of active and standby
frequencies. Please view Garmin documentation on message formats. Garmin messages
may be used at any time and may be interspaced by MGL binary protocol.
protocols. Functions supported are frequency lists and direct selection of active and standby
frequencies. Please view Garmin documentation on message formats. Garmin messages
may be used at any time and may be interspaced by MGL binary protocol.
General message format:
$02
STX
$05
DLE