Appendix G: Application Notes And Examples; Box Initializations; Mc-12Hd; Host - Lexicon MC-12HD Protocol Manual

Lexicon MC-12HD Serial Communications Protocol

Appendix G: Application Notes and Examples

1 Box initializations:

1.1 MC-12HD:

When the MC-12HD is powered on it will initialize the serial port and then transmit the DC_WAKEUP
Packet, and look for an ACK from the HOST. Currently, if an ACK is not received, the MC-12HD
continues to operate. This message is mostly for the HOST to know if the MC-12HD is in an operational
state.

1.2 HOST:

When the HOST issues a HOST_WAKEUP Packet the MC-12HD responds with an ACK and then
transmits the current FPD buffer with a DC_FPD notification. If the Host issues a HOST_WAKEUP
command and does not receive the ACK it should assume it is not connected or the MC-12HD is not
capable of responding on the RS232 and therefore further serial communications will not be possible. If
the MC-12HD RS232 is capable of communicating, the MC-12HD will respond to a HOST_WAKEUP
Command in any "Powered up" state including standby.

2 Getting System Wide Status and Setup:

TBD

3 Downloading the System Setup to the MC-12HD:

TBD
4 Simple System Control & System Status:
The HOST can control the system via the IR commands thus making any direct IR code a direct
command. Because of some limitations in the IR codes the HOST also has direct control over the system
volume, balance, fader, effect selection, zone 2 volume, balance and input selection through dedicated
commands.

5 Examples:

The following examples show the byte's transmitted for the MC-12HD Get Unit Configuration, and Send
MC-12HD IR Commands . They are shown as they should be transmitted from left to right.

5.1 MC-12HD Get Unit Configuration

The HOST initiates by sending the GET_UNIT_CONFIG command packet:
SOP DLL DC CMD AppDC EOP
F1 03 38 00 F2
If the command is received without error the MC-12HD responds with the UNIT_CONFIG response
packet:
44