Lexicon MC-8 V1.0 - SERIAL COMMUNICATIONS PROTOCOL DEFINITION REV... Manuale utente

Lexicon, Inc.

MC-8 Serial Communications Protocol Printed on: 04/01/03

Serial Communications Protocol Definition

Project: MC-8/MC-8B

Updated: April 1, 2003

Software Version 1.0

Protocol Version:

Major rev 1

Minor rev 4

Lexicon, Inc.

3 Oak Park

Bedford, MA 01730-1413

(781) 280-0300

Lexicon, Inc.

MC-8 Serial Communications Protocol Printed on: 04/01/03

Manufactured under license from Dolby Laboratories. “Dolby”, “Pro Logic”, and the double-D symbol are

trademarks of Dolby laboratories.

Lucasfilm and THX are trademarks or registered trademarks of Lucasfilm, Ltd.

Manufactured under license from Digital Theater Systems, Inc. U.S. Pat. No. 5,451,942; 5,956,674;

5,974,380; 5,978,762 and other world-wide patents issued and pending. “DTS”, “DTS-ES Extended

“LOGIC7” and the LOGIC7 symbol are registered trademarks of Lexicon, Inc., a Harman International

Company.

This document should not be construed as a commitment on the part of Lexicon, Inc. The information it

contains is subject to change without notice. Lexicon, Inc. assumes no responsibility for errors that may

appear within this document.

Lexicon, Inc.

3 Oak Park

Bedford, MA 01730-1413 USA

Tel 781-280-0300

Fax 781-280-0490

www.lexicon.com

Customer Support

Tel 781-280-0300

Fax 781-280-0495 (Sales)

Fax 781-280-0499 (Service)

Lexicon Part No. 070-15332 Rev 0

Lexicon, Inc.

MC-8 Serial Communications Protocol Printed on: 04/01/03

1Documents 5

1.1 Change List 5

2 Definitions 5

2.1 Protocol Version Cross-reference 5

3 Abbreviations 5

4 General Description 5

4.1 Physical Layer 7

4.2 Serial Port Driver 7

4.3 Errors 7

4.4 MC-8 Receive Buffer 7

4.5 MC-8 Hardware Verification 7

5 Data Link Layer 8

5.1 Errors 8

6 Application Layer 8

6.1 MC-8 Asynchronous Notification Packets 8

6.1.1 Wakeup Notification 9

6.1.2 Sleep Notification 9

6.1.3 Front Panel Display 9

6.1.4 MC-1 Parameter Change 10

6.1.5 MC-8 Parameter Notification by Id 11

6.2 Acknowledgment Packets 12

6.2.1 Acknowledge 12

6.2.2 No Acknowledge 13

6.3 Host Initiated Command Packets 13

6.3.1 Reset Unit 13

6.3.2 Restore 13

6.3.3 MC-1 Send IR Command 14

6.3.4 Get Unit Configuration 14

6.3.5 Get System Status 17

6.3.6 Get Zone 2 Status 19

6.3.7 Get Custom Name 20

6.3.8 Get Input Name by Id 20

6.3.9 Set System Volume 21

6.3.10 Set Main Balance 22

6.3.11 Set Front/Back Balance 23

6.3.12 Set Active Effect by Id 23

6.3.13 Set Zone2 Volume 24

6.3.14 Set Zone2 Left/Right Balance 25

6.3.15 Set Custom Name 25

6.3.16 Set Input Name by Id 26

6.3.17 Host Wakeup 27

6.3.18 Host Sleep 27

6.3.19 Get Communication Configuration 27

6.3.20 Set Communication Configuration 28

6.3.21 Set Mute 29

6.3.22 Send Display String Command 29

6.3.23 MC-8 Get Parameter Definition by Id 30

6.3.24 MC-8 Set Parameter Value by Id 32

Lexicon, Inc.

MC-8 Serial Communications Protocol Printed on: 04/01/03

6.3.25 MC-8 Set Parameter Value by Id, No Run 34

6.3.26 MC-8 Get Unit Configuration 34

6.3.27 MC-8 Send IR Command 37

6.3.28 MC-8 Get Parameter Value by Id 37

6.3.29 MC-8 Set Parameter Notification by Id 38

6.3.30 MC-8 Parameter Get Value String by Id 39

6.3.31 MC-8 Clear All Parameter Notifications 40

6.3.32 MC-8 Get System Status 40

6.3.33 MC-8 Get Zone Status 42

6.3.34 MC-8 Set System Volume 43

6.3.35 MC-8 Set Main Balance 43

6.3.36 MC-8 Set Front/Back Balance 44

6.3.37 MC-8 Set Active Effect by Id 44

6.3.38 MC-8 Set Zone2 Volume 45

6.3.39 MC-8 Set Zone2 Left/Right Balance 45

6.3.40 MC-8 Get Input Name by Id 46

6.3.41 MC-8 Set Input Name by Id 47

Appendix A Command Codes 48

Appendix B Error Codes 50

Appendix C DC-2, MC-1 IR-Codes 51

Appendix D MC-8 IR Codes 52

Appendix E MC-1 Input Id’s 53

Appendix F MC-8 Input Ids 53

Appendix G Protocol Constants 53

Appendix H MC-8 to MC-1 Effect Map 54

Appendix I MC-1 to MC-8 Effect ID Map 55

Appendix J MC-8 Mode Ids 56

Appendix K Application Notes and Examples 57

6.4 Box initializations: 57

6.4.1 MC-8: 57

6.4.2 HOST: 57

6.5 Getting System Wide Status and Setup: 57

6.5 Downloading the System Setup to the 57

6.6 MC-8: 57

6.7 Simple System Control & System Status: 57

6.8 Examples: 57

6.8.1 MC-8 Get Unit Configuration 57

6.8.2 Send MC-8 IR Command Example 59

Appendix L MC8 V1.00 Parameter ID List 59

Lexicon, Inc.

MC-8 Serial Communications Protocol Printed on: 04/01/03

1 Documents

The following documents should also be used with this document to understand how this protocol can be used with

an MC-8.

070-15481 Rev 0 Manual, Owner’s, MC-8/MC-8B

MC1/DC2 Serial Port Definition, Protocol Version 0.5

070-13227 MANUAL,OWNER'S,DC2

070-13278 MANUAL,OWNER'S,MC1

1.1 Change List

2 Definitions

User Parameter: A user changeable variable that stores a specific value that describes an operating

condition for the MC-8 system.

HOST: The device initiating or receiving the serial communication packets to/from the MC-8.

MC-8: The Lexicon product receiving or transmitting the serial communication packets to/from

the HOST.

Nonvolatile RAM: The area of memory in an MC-8 that stores users adjustable parameters. The Nonvolatile

RAM is battery backed, to maintain values during MC-8 power down.

2.1 Protocol Version Cross-reference

All references to MC-8 shall be valid for both the MC-8 and SDP-5 products unless specifically documented

otherwise. All references to MC-1 shall be valid for the MC-1, DC-2 and SDP-3 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-8 serial port and protocol communication is for an external connected HOST to control and

obtain status from the MC-8. The protocol has been designed to focus on two specific goals. The first is HOST

uploading and downloading of MC-8 configuration, and system/effect setups. The second is HOST control of basic

user adjustable parameters.(i.e. input, volume, balance…)

Lexicon, Inc.

MC-8 Serial Communications Protocol Printed on: 04/01/03

The MC-8 uses simple notification, command, response and acknowledgment packets to have communication

transactions with a given HOST. This protocol is designed for point to point communication between a HOST and

MC-8. The MC-8 Protocol is a 3 layered system. The MC-8 serial protocol allows for the MC-8, or the HOST, to

initiate a communication transaction. Most transactions are initiated by the HOST. MC-8 then responds to the

HOST command with either a response or acknowledgment packet. There are a few asynchronous notifications that

MC-8 initiates indicating system changes. Each transaction initiated must wait for a corresponding response before

initiating the next transmission.

The 3 protocol layers are: Physical, Data Link, and Application Layers.

The MC-8 Serial Protocol attempts to be as backward compatible with the MC-1 as possible. The basic structure of

the protocol has not changed.

CD VOL

Lexicon MC-8

HOST

Rs-232 Serial Link

Lexicon, Inc.

MC-8 Serial Communications Protocol Printed on: 04/01/03

4.1 Physical Layer

DB-9 RS232 Connector

Note: The wiring requirements for a 9 pin to 9 pin serial connection, are a male to female straight through cable.

4.2 Serial Port Driver

MC-8 serial port has been setup to operate as follows:

Operating Mode: Full Duplex

Baud rate: 19.2K baud

Data Size: 8 bits (1 byte)

Parity: Odd

Stop Bits: 1

Hardware Handshaking: None

4.3 Errors

The MC-8 will detect parity, framing and data overrun errors. If any of the physical layer errors are detected, the

complete packet is corrupted and the MC-8 will reset the transaction and begin to look for a start of packet byte.

4.4 MC-8 Receive Buffer

The MC-8 has an internal receive buffer. The buffer is 256 Bytes and will transmit a NAK packet with an error code

of DC_ERR_BUFFER_FULL to the HOST if the buffer is full. If the buffer is full, all data transmitted to the MC-8

will be ignored. Therefore, making the currently transmitted packet, if partially transmitted invalid.

4.5 MC-8 Hardware Verification

This test verifies the RS232 ports are working by comparing the transmitted signal (at pin 2) to the received signal

(at pin 3). The MC-8 transmits a known test signal just following a power up. The MC-8 monitors the serial port

receivers while transmitting the test signal. If the signals are the same, the test passes. In order to test this circuit,

RS232 Wraparound plug(s) are needed and must be installed at the female D9 connector(s) on the rear panel of the

MC-8 labeled “RS232”. The wraparound plug shorts pins 2 to 3, allowing for the MC-8 to receive the signal it is

transmitting. Once installed, power cycle the MC-8 and verify the following message is displayed on the FPD:

SERIAL PORT A PASSED

SERIAL PORT B PASSED

This message is displayed for about 2 seconds before entering normal operating mode. If no messages are displayed,

then both wrap tests failed.

MC-8

COM1

Transmit Data

Receive Data

Ground

Host

Receive Data

Transmit Data

Ground

9 Pin D-Shell (female) 9 Pin D-Shell (male)

9 Pin D-Shell (male)

9 Pin D-Shell (female)

Lexicon, Inc.

MC-8 Serial Communications Protocol Printed on: 04/01/03

5 Data Link Layer

The data link layer is used to define a transmission packet. The layer appends a header and tail that encloses the

transmitted application packet data. The data link header will contain the start of packet byte and count of bytes to

follow. The data link tail will contain the end of packet byte.

5.1 Errors

If the number of DLL data bytes received is the same as the data count and an EOP has not been received, the MC-8

responds by transmitting a NAK packet with an error code DC_ERR_INVALID_PACKET. The MC-8 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.

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-8 will respond by transmitting

a NAK packet with an error code DC_ERR_INVALID_PACKET. The MC-8 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-8 Asynchronous Notification Packets

MC-8 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.

Data Link Header:

Byte Number Description Value

First Byte(0) Start of Packet (SOP) 0xF1

Byte(1) DLL Data Count nn

Application Header:

Byte(2) Command nn

Byte(3)

APP Data Count (number of application data bytes to

Follow) nn

Application Data:

Byte(4) Data[0] nn

Byte(5) Data[1] nn

… Data[…] nn

Last Data Byte -1 Data[Data Count -1] nn

Data Link Tail:

Last Byte End of Packet (EOP) 0xF2

Lexicon, Inc.

MC-8 Serial Communications Protocol Printed on: 04/01/03

The notification packets are defined as follows:

6.1.1 Wakeup Notification

By transmitting the Wakeup Notification, MC-8 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-8.

6.1.1.1 Notification Packet Description

Application Header:

Command DC_WAKEUP 0x01

Data Count 0 0x00

Application Data:

N/A

6.1.1.2 Host Response

The MC-8 does not expect any response from the HOST.

6.1.2 Sleep Notification

By transmitting the Sleep Notification, MC-8 indicates the unit is shutting down into a standby mode. Because the

hard power switch could be activated independently of the MC-8 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-8.

6.1.2.1 Notification Packet Description

Application Header:

Command DC_SLEEP 0x02

Data Count 0 0x00

Application Data:

N/A

6.1.3 Front Panel Display

MC-8 will transmit the front panel display buffer following the update to the MC-8 front panel display. The MC-8

front panel display is 2 X 20 ASCII character display. The HOST can enable transmission of this notification

message by sending Host Wakeup (7.3.29). To disable transmission the HOST can send Host Sleep (7.3.30).

Transmission of the display buffer is asynchronous to other host/MC-8 communication and will only transmit

following the completion of any communication exchanges in progress or pending.

6.1.3.1 Notification Packet Description

Application Header:

Command DC_FPD 0x03

Data Count 42 0x2A

Application Data:

Data[0] - Data[20] Line1 ch ch ch… 0x00

Data[21] - Data[41] Line2 ch ch ch … 0x00

6.1.3.2 Data Description

Lexicon, Inc.

MC-8 Serial Communications Protocol Printed on: 04/01/03

Line1

Data Type: Null (0x00) terminated ASCII character string.

Max Length: DISP_LINE_LENGTH defined in Appendix G Protocol Constants.

Line2

Data Type: Null (0x00) terminated ASCII character string.

Max Length: DISP_LINE_LENGTH defined in Appendix G Protocol Constants.

The MC-8 includes 8 custom characters that are defined to display increments of a display block. (i.e. Volume Bar)

The custom characters are ASCII character codes 8E - 93(hex). The codes are used as follows:

'8E' - empty cell

'8F' - left 1 bar

'90' - left 2 bars

'91' - left 3 bars

'92' - left 4 bars

'93' - full cell

6.1.3.3 HOST Response

The MC-8 does not expect any response from the HOST.

6.1.4 MC-1 Parameter Change

MC-8 will transmit predetermined parameter change notifications. If a parameter value is changed due to any user

action or system action the MC-8 will transmit the current value of the parameter that is changing.

This command has been maintained for backward compatibility with MC-1. In order to maintain backward

compatibility, the MC-8 Parameters have been mapped to the MC-1 parameters as described in the Supported

System Parameters table listed below.

MC1 Parameter Change Notification can be enabled/disabled by using the Communication Configuration Packet as

described in 6.3.19 Get Communication Configuration and 6.3.20 Set Communication Configuration

The MC8 disables these notifications in its default state.

6.1.4.1 Notification Packet Description

Application Header:

Command DC_PARAM_CHG_MSG 0x04

Data Count 2 0x02

Application Data:

Data[0] ParamId nn

Data[1] Value nn

6.1.4.2 Data Description

ParamId:

Data Type: Unsigned 8 bit integer

Max: 255.

Value:

The Current Value for this system parameter.

Data Type: Unsigned 8 bit integer

Max: Set by the Max Value per the Parameter Definition response Packet for the

Parameter Id of this packet.

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