Lexicon MC-12HD - Application Layer; Asynchronous Notification Packets; Wakeup Notification; Sleep Notification

Lexicon MC-12HD Serial Communications Protocol
7 Application Layer
7.1 Asynchronous Notification Packets
MC-12HD has been designed to transmit the asynchronous notification packets following these system
changes:
1. Power On
2. Entering Standby
3. Front Panel Display update
4. Parameter Value Changes.
The notification packets are defined as follows:
7.1.1 Wakeup Notification
By transmitting the Wakeup Notification, MC-12HD indicates the unit has just “powered on” or reset and
is ready to receive host commands. This notification is primarily for the HOST to know the status of the
MC-12HD.
7.1.1.1 Notification Packet Description
Application Header:
Command DC_WAKEUP 0x01
Data Count 0 0x00
Application Data:
N/A
7.1.1.2 Host Response
The MC-12HD does not expect any response from the HOST.
7.1.2 Sleep Notification
By transmitting the Sleep Notification, MC-12HD indicates the unit is shutting down into a standby mode.
Because the hard power switch could be activated independently of the MC-12HD system software, hard
power down will not be notified. Acknowledgment of the Sleep Notification is not required. This
notification is primarily for the HOST to know the operating status of the MC-12HD.
7.1.2.1 Notification Packet Description
Application Header:
Command DC_SLEEP 0x02
Data Count 0 0x00
Application Data:
N/A
7.1.3 Front Panel Display
MC-12HD will transmit the front panel display buffer following the update to the MC-12HD front panel
display. The MC-12HD front panel display is 2 X 20 ASCII character display. The HOST can enable
transmission of this notification message by sending
Host Wakeup. To disable transmission the HOST
can send
Host Sleep. Transmission of the display buffer is asynchronous to other host/MC-12HD
communication and will only transmit following the completion of any communication exchanges in
progress or pending.
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