Lexicon MC-12HD Serial Communications Protocol
1 Documents
The following documents should also be used with this document to understand how this protocol can be
used with an MC-12HD:
070-17555 Guide, User, MC12HD
1.1 Change List
1/11/06 New Document based on MC-12/MC-12B V5.0.
1/12/06 Updated Parameter Id Reference Table for MC12HD V 1.00 software.
2 Definitions
User Parameter: A user changeable variable that stores a specific value that describes an
operating condition for the MC-12HD system.
HOST: The device initiating or receiving the serial communication packets to/from the
MC-12HD.
MC-12HD: The Lexicon product receiving or transmitting the serial communication packets
to/from the HOST.
Nonvolatile RAM: An area of memory in an MC-12HD that stores user-adjustable parameters. The
Nonvolatile RAM is battery backed, to maintain values during power-down.
2.1 Protocol Version Cross-reference
All references to MC-12HD shall be valid for both the MC-12HD and SDP-40HD products unless
specifically documented otherwise.
3 Abbreviations
SOP Start of Packet
EOP End of Packet
ACK Acknowledge
NAK No Acknowledge
FPD Front Panel Display
4 General Description
The intention of the MC-12HD serial port and protocol communication is for an external connected HOST
to control and obtain status from the MC-12HD. The protocol has been designed to focus on two specific
goals. The first is HOST uploading and downloading of MC-12HD configuration, and system/effect
setups. The second is HOST control of basic user adjustable parameters (i.e. input, volume, balance…).
4
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