Lexicon RV8 V1.0 - SERIAL COMMUNICATIONS PROTOCOL DEFINITION REV... User manual

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Serial Communications Protocol Definition
Project: RV8
Software Version 1.0
Protocol Version:
Major rev 1
Minor rev 7

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Manufactured under license from Dolby Laboratories. "Dolby," "Pro Logic," and the double-D
symbol are trademarks of Dolby Laboratories. "Surround EX" is a jointly developed technology of
THX and Dolby Laboratories, Inc., and is a trademark of Dolby. Used under authorization.
THX, Ultra and Ultra2 are trademarks of THX Ltd., which may be registered in some jurisdictions.
All rights reserved.
Manufactured under license from Lucasfilm Ltd. U.S. Patent Nos. 5,043,970; 5,189,703; and/or
5,222,059. European Patent No. 0323830. Other U.S. and foreign patents pending. Lucasfilm is a
trademark of Lucasfilm Ltd. Surround EX is a trademark of Dolby Laboratories. Used under
authorization.
"DTS," "DTS-ES," "Neo:6, " and “DTS 96/24” are trademarks of Digital Theater Systems, Inc.
"Lexicon," "LOGIC7," and the L7 logo are registered trademarks of Harman International
Industries, Inc. U.S. Patent Nos. D454,553; D454,860; 5,796,844; 5,870,480 and other worldwide
patents issued and pending.
© 2004 Harman Specialty Group. All rights reserved.
This document should not be construed as a commitment on the part of Harman Specialty Group.
The information it contains is subject to change without notice. Harman Specialty Group assumes
no responsibility for errors that may appear within this document.
Lexicon
3 Oak Park
Bedford, MA 01730-1413 USA
Telephone: [phone]
Fax: [phone]
www.lexicon.com
Customer Support
Telephone: [phone]
Sales Fax: [phone]
Service Fax: [phone]
Product Shipments
16 Progress Road
Billerica, MA 01821-5730 USA
Harman Specialty Group
Lexicon Part No. 070-16402 REV 0

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1Documents 5
2 Definitions 5
2.1 Protocol Version Cross-reference 5
3 Abbreviations 5
4 General Description 5
5 Physical Layer 6
DB-9 RS232 Connector 6
5.2 Serial Port Driver 6
5.3 Errors 6
5.4 RV8 Receive Buffer 7
5.5 RV8 Hardware Verification 7
6 Data Link Layer 7
6.1 Errors 7
7 Application Layer 8
7.1 RV8 Asynchronous Notification Packets 8
7.1.1 Wakeup Notification 8
7.1.2 Sleep Notification 8
7.1.3 Front Panel Display 9
7.1.4 RV8 Parameter Notification by Id (RV8) 9
7.2 Acknowledgment Packets 11
7.2.1 Acknowledge (RV8, MC-12, MC-1) 11
7.2.2 No Acknowledge (RV8, MC-12, MC-1) 11
7.3 Host Initiated Command Packets 11
7.3.1 Reset Unit (RV8, MC-12, MC-1) 11
7.3.2 Get Custom Name 12
7.3.3 Get ARRAY Definition(RV8) 12
7.3.4 Get ARRAYITEM(RV8) 13
7.3.5 Set ARRAYITEM(RV8) 14
7.3.6 Set Custom Name 14
7.3.7 Host Wakeup 15
7.3.8 Host Sleep 15
7.3.9 Get Communication Configuration 16
7.3.10 Set Communication Configuration 16
7.3.11 Set Mute 17
7.3.12 Send Display String Command 18
7.3.13 Get Parameter Definition by Id 18
7.3.14 Set Parameter Value by Id 21
7.3.15 Set Parameter Value by Id, No Run 22
7.3.16 Get Unit Configuration 23
7.3.17 Send IR Command 26
7.3.18 Get Parameter Value by Id 26
7.3.19 Set Parameter Notification by Id 27
7.3.20 Parameter Get Value String by Id 28
7.3.21 Clear All Parameter Notifications 29
7.3.22 Get System Status 29
7.3.23 Get Record Status 31
7.3.24 Set System Volume 31
7.3.25 Set Main Balance 32
7.3.26 Set Front/Back Balance 32

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7.3.27 Set Active Effect by Id 33
7.3.28 Set Zone2 Volume 34
7.3.29 Set Zone2 Left/Right Balance 34
7.3.30 Get Input Name by Id 35
7.3.31 Set Input Name by Id Error! Bookmark not defined.
Appendix A Command Codes 366
Appendix B Error Codes 388
Appendix D RV8 IR Codes 41
Appendix F RV8 Input Ids 42
Appendix G Protocol Constants 42
Appendix J RV8 Mode Ids 43
1.1 Examples: 45
1.1.1 Send RV-8 IR Command Example 45
1.2 RV-8 V1.00 Parameter ID List 45

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1 Documents
The following documents should also be used with this document to understand how this protocol can be
used with an RV8.
070-15838 User Guide, RV-8
2 Definitions
User Parameter: A user changeable variable that stores a specific value that describes an
operating condition for the RV8 system.
HOST: The device initiating or receiving the serial communication packets to/from the
RV8.
RV8: The Lexicon product receiving or transmitting the serial communication packets
to/from the HOST.
Nonvolatile FLASH: The area of memory in an RV8 that stores users adjustable parameters.
2.1 Protocol Version Cross-reference
All references to RV8 shall be valid 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 RV8 serial port and protocol communication is for an external connected HOST to
control and obtain status from the RV8. The protocol has been designed to focus on two specific goals.
The first is HOST uploading and downloading of RV8 configuration, and system/effect setups. The second
is HOST control of basic user adjustable parameters.(i.e. input, volume, balance…)
The RV8 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 RV8. The RV8 Protocol is a 3 layered system. The RV8 serial
protocol allows for the RV8, or the HOST, to initiate a communication transaction. Most transactions are
initiated by the HOST. RV8 then responds to the HOST command with either a response or
acknowledgment packet. There are a few asynchronous notifications that RV8 initiates indicating system
CD VOL
Lexicon RV-8
HOST
Rs-232 Serial Link

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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.
5 Physical Layer
5.1 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.
5.2 Serial Port Driver
RV8 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
5.3 Errors
The RV8 will detect parity, framing and data overrun errors. If any of the physical layer errors are detected,
the complete packet is corrupted and the RV8 will reset the transaction and begin to look for a start of
packet byte.
Physical Layer (RS232)
Data Link Layer
Application Layer
RV8
COM1
Transmit Data
Receive Data
Ground
Host
Receive Data
Transmit Data
Ground
2
3
5
2
3
5
9 Pin D-Shell (female) 9 Pin D-Shell (male)
2
3
5
2
3
5
9 Pin D-Shell (male)
9 Pin D-Shell (female)

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5.4 RV8 Receive Buffer
The RV8 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 RV8 will be ignored. Therefore, making the currently transmitted packet, if partially
transmitted invalid.
5.5 RV8 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 RV8 transmits a known test signal just following a power up. The RV8 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 RV8 labeled “RS232”. The wraparound plug shorts pins 2 to 3, allowing for the
RV8 to receive the signal it is transmitting. Once installed, power cycle the RV8 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.
6 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.
6.1 Errors
If the number of DLL data bytes received is the same as the data count and an EOP has not been received,
the RV8 responds by transmitting a NAK packet with an error code DC_ERR_INVALID_PACKET. The
RV8 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.
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

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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 RV8 will respond
by transmitting a NAK packet with an error code DC_ERR_INVALID_PACKET. The RV8 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.
7 Application Layer
7.1 RV8 Asynchronous Notification Packets
RV8 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, RV8 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 RV8.
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 RV8 does not expect any response from the HOST.
7.1.2 Sleep Notification
By transmitting the Sleep Notification, RV8 indicates the unit is shutting down into a standby mode.
Because the hard power switch could be activated independently of the RV8 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 RV8.
7.1.2.1 Notification Packet Description
Application Header:
Command DC_SLEEP 0x02
Data Count 0 0x00
Application Data:
N/A

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7.1.3 Front Panel Display
RV8 will transmit the front panel display buffer following the update to the RV8 front panel display. The
RV8 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/RV8 communication and
will only transmit following the completion of any communication exchanges in progress or pending.
7.1.3.1 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
7.1.3.2 Data Description
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 RV8 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
7.1.3.3 HOST Response
The RV8 does not expect any response from the HOST.
7.1.4 RV8 Parameter Notification by Id
RV8 will transmit parameter change notifications if they are enabled using the command described in 7.3.42
(MC12_Set_Parameter_Notification_By_Id). If a parameter value is changed due to any user action or
system action the RV8 will transmit the current value of the parameter that is changing.

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7.1.4.1 Command Packet Description
Application Header:
Command MC_PARAM_NOTIFICATION_BY_ID 0x05
Data Count 24 0x18
Application Data:
Data[0] ParamId(LSB) nn
Data[1] ParamId(MSB) nn
Data[2] ParamType nn
Data[3-23] Value[0 -20]
nn nn
nn…
7.1.4.2 Data Description
Same as Paragraph 7.3.37.2
7.1.4.3 HOST Response
The RV8 does not expect any response from the HOST.
7.1.4.4 Defaults
The following Parameters Notifications are Enabled in the RV8 default state:
Parameter RV8 Parameter Name
Current Mode PARAM.MAIN.EFFECT
Main Zone Mute PARAM.MAIN.MUTE
Main Zone Volume PARAM.MAIN.VOLUME
Main Zone Balance PARAM.MAIN.BALANCE
Main Zone Input Selection PARAM.MAIN.INPUT
Zone 2 Input PARAM.ZONE.INPUT
Zone 2 Volume PARAM.ZONE.VOLUME
Zone 2 Balance PARAM.ZONE.BALANCE
Zone 2 Mute PARAM.ZONE.MUTE
Bass PARAM.MAIN.BASS
Treble PARAM.MAIN.TREBLE
Loudness PARAM.MAIN.LOUDNESS
Tilt PARAM.MAIN.TILT
Menu Background On/Off PARAM.OSD.BACKGND
See RV-8 V1.00 Parameter ID List for the Parameter ID definitions.

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7.2 Acknowledgment Packets
Acknowledge and No Acknowledge packets are used to communicate transmission, packet and data
validation status. Both the HOST and RV8 can transmit and receive these packets.
7.2.1 Acknowledge
7.2.1.1 Packet Description
Application Header:
Command DC_ACK 0xE0
Data Count 10x01
Application Data:
Data[0] Command nn
7.2.1.2 Data Description
Command:
DataType: Valid RV8 command as defined in Appendix A Command Codes.
7.2.2 No Acknowledge
7.2.2.1 Packet Description
Application Header:
Command DC_NACK 0xE1
Data Count 20x02
Application Data:
Data[0] Command nn
Data[1] ErrorCode nn
7.2.2.2 Data Description
Command:
DataType: Valid RV8 command as defined in Appendix A Command Codes.
ErrorCode:
DataType: Error code as defined in Appendix B Error Codes.
7.3 Host Initiated Command Packets
The RV8 serial communication protocol has been designed to respond to the following commands as
described below. Each command is transmitted to the RV8 with the identified parameters. If the command
is successfully received and processed by the RV8, the unit will respond with the described response packet
or action.
7.3.1 Reset Unit
Commands the RV8 to soft reset.
7.3.1.1 Command Packet Description
Application Header:
Command DC_CMD_RESET 0x10
Data Count 0 0x00
Application Data:

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N/A
7.3.1.2 RV8 Response
The RV8 will perform an internal reset. After reset the RV8 will go through a soft power-up initialization.
This includes transmitting the “Wakeup Notification Packet”. A soft reset does not reinitialize the RV8.
Nonvolatile RAM is maintained.
7.3.2 Get Custom Name
Request to RV8 for an effect definition. RV8 will respond with “Custom Name Packet”.
7.3.2.1 Command Packet Description
Application Header:
Command DC_CMD_GET_CUST_NAME 0x2B
Data Count 0 0x00
Application Data:
N/A
7.3.2.2 Data Description
N/A
7.3.2.3 Custom Name Response Packet
Application Header:
Command DC_RESP_CUST_NAME 0x89
Data Count
Number of Characters in
CustomName + 1 nn
Application Data:
Data[0]- Data[DataCount-1] CustomName ch ch ch … 0x00
7.3.2.4 Data Description
CustomName:
Data Type: Null (0x00) terminated ASCII character string.
Max Length: CUSTOM_NAME_LENGTH defined in Appendix G Protocol Constants.
7.3.3 Get ARRAY Definition(RV8)
This command will request the array definitions for the array.

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7.3.3.1 Command Packet Description
Application Header:
Command MC_CMD_GET_ARRAY_DEFS 0x49
Data Count 3 0x03
Application Data:
Data[0] ParamID(LSB) 0xnn
Data[1] ParamID(MSB) 0xnn
Data[3] Param Type 0x0A
7.3.3.2
Application Header:
Command MC_RESP_ARRAY_DEF 0x97
Data Count 4 0x04
Application Data:
Data[0] Number Elements in Array(LSB) 0xnn
Data[1] Number Elements in Array(MSB) 0xnn
Data[2] Number Bytes/ArrayItem(LSB) 0xnn
Data[3] Number Bytes/ArrayItem(MSB) 0xnn
7.3.4 Get ARRAYITEM(RV8)
This command will request the current state of the ARRAY ITEM.
7.3.4.1 Command Packet Description
Application Header:
Command MC_CMD_GET_ARRAYITEM 0x4A
Data Count 5 0x05
Application Data:
Data[0] Param ID for Array(LSB) 0xnn
Data[1] Param ID for Array(MSB) 0xnn
Data[2] Param Type 0x0B
Data[3] Index(LSB) 0xnn
Data[4] Index(MSB) 0xnn
7.3.4.2 ArrayItem Response Packet
Application Header:
Command MC_RESP_ARRAYITEM 0x98
Data Count Num Bytes/ArrayItem+5 0xnn
Application Data:
Data[0] ParamID(LSB) 0xnn
Data[1] ParamID(MSB) 0xnn
Data[2] ParamType 0x0B
Data[3] Index(LSB) 0xnn
Data[4] Index(MSB) 0xnn
Data[5]..Data[
NumBytes/Arr
ayItem+5] The Data 0xnn

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7.3.4.3 Data Validation
If the ParamID or the Index is invalid, the RV8 will ignore the command and transmit a DC_NAK
command with an error code DC_INVALID_DATA.
7.3.5 Set ARRAYITEM(RV8)
This command will set the array item to the value supplied by the data.
7.3.5.1 Command Packet Description
Application Header:
Command MC_CMD_SET_ARRAYITEM 0x4B
Data Count Num Bytes/ArrayItem + 5 0xnn
Application Data:
Data[0] ParamID of Array(LSB) 0xnn
Data[1] ParamID of Array(MSB) 0xnn
Data[2] ParamType 0x0B
Data[3] Index(LSB) 0xnn
Data[4] Index(MSB) 0xnn
Data[5]..Dat
a[Num
Bytes/ArrayI
tem+5] ArrayItem Data 0xnn
7.3.5.2 Data Description
Value:
Data Type:
The data can be a simple type or an aggregate of several types. It the arrayitem contains 16 bit or
32 numeric data, the protocol assumes little-endian byte ordering.
7.3.5.3 RV8 Response
RV8 will set the Array Item to the values sent to it from this packet and transmit a DC_ACK command.
7.3.5.4 Data Validation
If the ParamID is invalid, the RV8 will ignore the command and transmit a DC_NAK command with an
error code DC_INVALID_DATA.
If the index command is greater than or equal to the number of ArrayItems in the array, the RV8 will ignore
the command and transmit a DC_NAK command with an error code DC_ERR_BAD_ARRAY_INDEX.
If the number of bytes per arrayitem in the packet is different from what RV8 expects for the number of
bytes per arrayitem, RV8 will ignore the command and transmit a DC_NAK command with an error code
DC_ERR_ARRAYITEM_SIZE_MISMATCH.
7.3.6 Set Custom Name
Sets the Custom Name that can be displayed when the unit powers up.
7.3.6.1 Packet Description
Application Header:

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Command DC_CMD_SET_CUST_NAME 0x2C
Data Count
Number of characters in
CustomName + 2 nn
Application Data:
Data[0] CustomNameEnable nn
Data[1]-Data[DataCount-1] CustomName ch ch ch … 0x00
7.3.6.2 Data Description
CustomNameEnable: Enables/Disables the Custom Name Display.
DataType: Boolean
TRUE: CustomName Enabled
FALSE: CustomName Disabled
CustomName:
Data Type: Null (0x00) terminated ASCII character string.
Max Length: CUSTOM_NAME_LENGTH defined in Appendix G Protocol Constants.
7.3.6.3 RV8 Response
If the custom name enable is TRUE then the custom name banner is display on “power on”. If the Custom
Name Enable is FALSE the custom name is not displayed. The CustomName string is copied to
Nonvolatile RAM. The RV8 will ACK when completed with this command.
7.3.6.4 Data Validation:
No data validation is done on the transmitted data.
7.3.7 Host Wakeup
By transmitting the Wakeup Notification, the Host indicates it has just “powered on” or reset and is ready to
receive RV8 Notifications or Responses. The Host is assumed to be asleep upon power up of the RV8.
Host status is maintained during standby.
7.3.7.1 Command Packet Description
Application Header:
Command HOST_WAKEUP 0x11
Data Count 0 0x00
Application Data:
N/A
7.3.7.2 Data Description
N/A
7.3.7.3 RV8 Response
The RV8 will respond to this command with an ACK. The unit also returns the input name, audio status,
and mode.
7.3.8 Host Sleep
By transmitting the Sleep command, the Host indicates it has just “powered down” and will no longer
respond to RV8 Notifications. No Acknowledgment is expected. The Host is assumed to be asleep upon
power up of the RV8. Host status is maintained during standby.
7.3.8.1 Packet Description

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Application Header:
Command HOST_SLEEP 0x12
Data Count 0 0x00
Application Data:
N/A
7.3.8.2 Data Description
N/A
7.3.9 Get Communication Configuration
This command is a request to the RV8 for the current communications configuration for the serial port and
protocol. The RV8 responds to this command with a Communication Configuration Packet.
7.3.9.1 Command Packet Description
Application Header:
Command DC_CMD_GET_COM_CONFIG 0x2F
Data Count 0 0x00
Application Data:
N/A
7.3.9.2 Communication Configuration Response Packet
Application Header:
Command DC_RESP_COM_CONFIG 0x8C
Data Count 1 0x01
Application Data:
Data[0] Configuration Register 0 nn
7.3.9.3 Data Description
Data Word Bit Definition
0 0 Acknowledge Enable
0 1 Parameter Change Enable
Acknowledge Enable:
TRUE Indicates the RV8 will transmit Acknowledge Notification’s to the Host.
FALSE Indicates the RV8 will not transmit any positive Acknowledge Notification
messages. The RV8 will always transmit NAK error notification messages.
Parameter Change Enable:
TRUE Indicates the RV8 will transmit any parameter change Notification as specified
in the Parameter Change Notification Message.
FALSE Indicates the RV8 will not transmit parameter change Notifications.
7.3.10 Set Communication Configuration
The Set Communication Configuration Command allows the serial port user to set up the various serial
port/ protocol configuration parameters.
7.3.10.1 Command Packet Description

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Application Header:
Command DC_CMD_SET_COM_CONFIG 0x30
Data Count 1 0x01
Application Data:
Data[0] Configuration Register 0 nn
7.3.10.2 Data Description
Data Word Bit Definition
0 0 Acknowledge Enable
0 1 Parameter Change Enable
Acknowledge Enable:
TRUE Indicates the RV8 will transmit Acknowledge Notification’s to the Host.
FALSE Indicates the RV8 will not transmit any positive Acknowledge Notification
messages. The RV8 will always transmit NAK error notification messages.
Parameter Change Enable:
TRUE Indicates the RV8 will transmit any parameter change Notification as specified
in the Parameter Change Notification Message.
FALSE Indicates the RV8 will not transmit parameter change Notifications.
7.3.10.3 RV8 Response
The data values transmitted will be copied over to the registers stored in nonvolatile RAM. The RV8 will
respond with an ACK Packet.
7.3.11 Set Mute
The Set Mute Command message allows the RS232 users to set/clear the RV8 mute state directly.
7.3.11.1 Command Packet Description
Application Header:
Command DC_CMD_SET_MUTE 0x31
Data Count 1 0x01
Application Data:
Data[0] Mute State nn
7.3.11.2 Data Description
MUTE State:
Value Definition Description
0 UNMUTE The user mute state is set to unmuted. The RV8 may still
be muted for other internal reasons.
1 USER MUTE The system volume decrements by the specified user
amount as set in the OUTPUT LEVELS Menu.
2 FULL MUTE The system is fully muted.
7.3.11.3 RV8 Response
The RV8 will set the mute state according to the value transmitted. The RV8 may still be full muted if
other conditions require the audio path to be muted. This is only a direct access to the user mute state.
7.3.11.4 Data Validation

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The data value transmitted to the RV8 will be verified as a valid value. If it is valid the RV8 will set/clear
the mute and respond with an ACK Packet. If the data value is invalid the RV8 will respond with a
DC_INVALID_DATA error NAK.
7.3.12 Send Display String Command
This command allows the Host to send a 40-character string to the RV8 for display on the OSD. The front
panel display goes blank and the message is only displayed on the OSD.
7.3.12.1 Packet Description
Application Header:
Command DC_CMD_SET_DISPLAY_STR 0x33
Data Count Number of characters in the
DisplayStr + 2
nn
Application Data:
Data[0] DisplayFlags nn
Data[1]-Data[DataCount-1] DisplayStr ch ch ch … 0x00
7.3.12.2 Data Description
Display Command Flags:
Word Bit Definition
0 0 FPD only: If set TRUE, the display string will only be sent to the FPD device for display.
0 1 Undefined.
0 2 Undefined.
0 3 Undefined.
0 4 Undefined.
0 5 Undefined.
0 6 Undefined.
0 7 Undefined.
Display String:
Data Type: Null (0x00) terminated ASCII character string.
Max Length: 40 characters.
7.3.12.3 RV8 Response
The display string is sent to the OSD and Front Panel Display. The RV8 will ACK when completed with
this command.
7.3.12.4 Data Validation:
If a string length exceeds the 40 character maximum the string will be truncated before displaying and the
RV8 transmit a DC_NAK command with an error code DC_INVALID_DATA.
7.3.13 Get Parameter Definition by Id
Request to RV8 for a Parameter Definition by Parameter Id. RV8 will respond with “RV8 Parameter
Definition Packet”.

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RV-8 Serial Communications Protocol Printed on: 01/18/05
© 2004 Lexicon, Inc. All rights reserved. 19 of 74
7.3.13.1 Command Packet Description
Application Header:
Command MC_GET_PARAM_BY_ID 0x35
Data Count 2 0x02
Application Data:
Data[0] ParamId(LSB) nn
Data[1] ParamId(MSB) nn
7.3.13.2 Data Description
ParamId:
Data Type: Unsigned 16 bit Integer
Max Value: Max Parameter Count as reported by the RV8 Unit Configuration Response
Packet in 7.3.16.2
7.3.13.3 Data Validation:
If the ParamId is not a valid Id the RV8 will respond with a NAK packet and error code DC_
INVALID_PARAM_ID.
7.3.13.4 Parameter Definition Response Packet
The following Packet has been defined as follows for RV8 V1.00. Future releases may modify this
definition.
Application Header:
Command MC_SYS_PARAM_DEF_PKT 0x8F
Data Count 110 0x6E
Application Data:
Data[0] ParamId(LSB) nn
Data[1] ParamId(MSB) nn
Data[2] ParamType nn
Data[3] MAX Value(LSB) nn
Data[4] MAX Value(MSB) nn
Data[5] MIN Value(LSB) nn
Data[6] MIN Value(MSB) nn
Data[7-27] CurrentValue[0 -20] nn nn nn…
Data[28]-Data[108] Parameter Path
ch ch ch …
0x00
Data[108] Read Only nn
7.3.13.5 Data Description
ParamId:
Data Type: Unsigned 16 bit Integer
Max Value: Max Parameter Count as reported by the RV8 Unit Configuration Response
Packet in 7.3.16.2

Lexicon, Inc.
RV-8 Serial Communications Protocol Printed on: 01/18/05
© 2004 Lexicon, Inc. All rights reserved. 20 of 74
ParamType:
Param Type Name ParamTy
pe ID
Type Description Data Size
(Bytes)
PARAM_TYPE_UINT8 0 Unsigned 8 bit integer(0 to
255)
1
PARAM_TYPE_UINT16 1 Unsigned 16 bit integer(0 to
65535)
2
PARAM_TYPE_CSTR8 2 Zero terminated string of 8
ascii characters
9
PARAM_TYPE_CSTR13 3 Zero terminated string of 13
ascii characters
14
PARAM_TYPE_UINT32 4 Unsigned 32 bit integer (0 to
4,294,967,295 )
4
PARAM_TYPE_BOOLEAN 5 Boolean( 0 to 1) 1
PARAM_TYPE_INT8 6 Signed 8 bit integer
(-127 to 128)
1
PARAM_TYPE_BRANCH 7 Parameter Branch N/A
PARAM_TYPE_INT16 8 Signed 16 bit integer
(-32,767 to 32,768)
2
PARAM_TYPE_CSTR20 9 Zero terminated string of 20
ascii characters
21
PARAM_TYPE_ARRAY 10 Unsigned 16 bit number
representing the number of
elements in the array,
another 16 bit number
representing the number of
bytes in an ArrayItem
4
PARAM_TYPE_ARRAYITEM 11 Not Used Yet 0
Data:
The data value transmitted is dependent on the ParamType, as described above. The
CurrentValue is always packed starting at the CurrentValue [0] byte in the packet. For
multi-byte data, the values are packed LSB first(CurrentValue [0]) to MSB(CurrentValue
[0+(num bytes-1)]). For example: Setting a given signed 16 bit parameter to a value of -
300 the data array would be packed as follows:
Data[0] = 0xd4
Data[1] = 0xfe
Data[2 - 13] = don't care.
If a parameter's current value is a signed 16 bit parameter with a value of -3 the data array
would be packed as follows:
Data[0] = 0xfd
Data[1] = 0xff
Data[2 - 13] = don't care.
All signed values are in the 2's compliment format.
Max Value:
This is a 16 bit value representing the maximum value for a parameter. Parameter values
exceeding the maximum will be limited to the maximum. This may be a signed or
unsigned value depending on the Parameter Type.
Min Value: