Application Layer; Mc-4 Asynchronous Notification Packets; Wakeup Notification; Sleep Notification - Lexicon MC-4 V1.00 - SERIAL PROTOCOL DEFINITIONS REV 1-6 Manual

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In addition, each byte of a packet must be received sequentially and within the INTER_PACKET_TIME. If
any of the bytes within a packet transmission exceeds the INTER_PACKET_TIME, the MC-4 will respond
by transmitting a NAK packet with an error code DC_ERR_INVALID_PACKET. The MC-4 then continues
to look for a SOP byte and will not process the erroneous application packet. The HOST can use this as
an indicator to retransmit the corrupted packet.

6 Application Layer

6.1 MC-4 Asynchronous Notification Packets

MC-4 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:

6.1.1 Wakeup Notification

By transmitting the Wakeup Notification, MC-4 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-4.
6.1.1.1 Notification Packet Description
6.1.1.2 Host Response
The MC-4 does not expect any response from the HOST.

6.1.2 Sleep Notification

By transmitting the Sleep Notification, MC-4 indicates the unit is shutting down into a standby mode.
Because the hard power switch could be activated independently of the MC-4 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-4.
6.1.2.1 Notification Packet Description
Application Header:
Command DC_WAKEUP
Data Count 0
Application Data:
N/A
Application Header:
Command DC_SLEEP
Data Count 0
Application Data:
N/A
MC-4 Serial Communications Protocol
0x01
0x00
0x02
0x00
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