Lexicon RT-20 Use and maintenance manual

Harman Specialty Group 3 Oak Park, Bedford, MA, 01730-1413 USA
Customer Service: Telephone: [phone] | Service Fax: [phone] | www.lexicon.com
Part No. 070-17224 | Rev 0 | 03/05
RT-20 Universal Disc Player
RS-232 Control Guide

Lexicon
RT-20 Universal Disc Player RS-232 Control Guide
Manufactured under license from Dolby Laboratories. “Dolby” and the double-D symbol are trademarks of Dolby
Laboratories. Confidential unpublished works. ©1992-1997 Dolby Laboratories. All rights reserved.
“HDMI,” the HDMI logo and High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC.
“DTS” and “DTS 96/24” are trademarks of Digital Theater Systems, Inc.
“SACD” and the SACD logo are trademarks of Sony Electronics, Inc.
“TosLink” is a registered trademark of Toshiba Corporation.
“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.
This product incorporates copyright protection technology that is protected by method claims of certain U.S. patents and other intellectual
property rights owned by Macrovision Corporation and other rights owners. Use of this copyright protection technology must be authorized by
Macrovision Corporation, and is intended for home and other limited viewing uses only unless otherwise authorized by Macrovision
Corporation. Reverse engineering or disassembly is prohibited.
©2005 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.
3 Oak Park
Bedford, MA 01730-1413 USA
Telephone: [phone]
Fax: [phone]
www.lexicon.com
Customer Service
Telephone: [phone]
Sales Fax: [phone]
Service Fax: [phone]
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Part No. 070-17224 | Rev 0 | 03/05

2
Table of Contents
1. Introduction...............................................................................................................................................................................3
1-1. Purpose..............................................................................................................................................................................3
1-2. References.........................................................................................................................................................................3
2. System Description.................................................................................................................................................................3
2-1. Overview............................................................................................................................................................................3
2-2. BlockDiagram...................................................................................................................................................................3
2-3. RT-20 RS-232 Connector PinDefinition........................................................................................................................3
3. Detailed Description.................................................................................................................................................................4
3-1. Connectionformat.............................................................................................................................................................4
3-1-1. Physical connection..................................................................................................................................................4
3-2. Transmissiondatapacketformats...................................................................................................................................4
3-2-1. TransmissiondatapacketsfromtheHOSTto theRT-20.....................................................................................4
3-2-1-1 CommandPackets.........................................................................................................................................4
3-2-1-2. Status Request Packets..................................................................................................................................4
3-2-2. ResponsedatapacketsfromtheRT-20totheHOST.........................................................................................5
3-2-2-1. ACK/NAKResponsePackets.......................................................................................................................5
3-2-2-2. Auto Status Feedback Packets......................................................................................................................5
3-3. DataTransaction Sequencing andTimingRequirements...........................................................................................6
3-3-1. DataPacketTransactionSequencingRequirements...........................................................................................6
3-3-2. DataTransactionTimingRequirements.................................................................................................................6
3-3-3. Specific Requirements forAuto Status Feedback..................................................................................................6
3-3-4. Exampleof thetransactions.....................................................................................................................................6
3-3-5. ExamplesofHOST/RT-20handshaking................................................................................................................7
3-3-5-1. Exampleofsuccessfulhandshaking..............................................................................................................7
3-3-5-2. Examplesofhandshakingerrors....................................................................................................................7
3-4. Commands.......................................................................................................................................................................8
3-4-1. HOSTCommandlist................................................................................................................................................8
3-4-2. SpecificCommands............................................................................................................................................... 10
3-5. StatusRequestandStatusResponseDataPackets.................................................................................................11
3-5-1. HOST Status request and Status Response/feedback list AST Layer: 1 ........................................................11
3-5-2. HOST Status request and Status Response/feedback list ASTLayer: 2........................................................11
3-5-3. HOST Status request and Status Response/feedback list ASTLayer: 3....................................................... 12
3-5-4. Special Status request and Status Response list AST Layer: None................................................................ 13
3-6. StatusFeedback........................................................................................................................................................... 14
3-7. Data Packet COMMANDList..................................................................................................................................... 16

3
1. Introduction
1-1. Purpose
This document was written as a reference specification for the Lexicon RT-20 Universal Disc Player RS-232
interface.
1-2. References
Refer to the RT-20 User Guide for information about the RS-232connector and RT-20functionality.
RT-20 User Guide p/n 070-17261.
2. System Description
2-1. Overview
The RT-20 RS-232 interface has been designed as a Master-Slave communication protocol, in which the RT-20 is
the slave device. The Master-system controller is referred to as the HOST device.
2-2. Block Diagram
2-3. RT-20 RS-232 Connector Pin Definition
The RT-20 serial RS-232 connector is a male 9-pin D-sub connector. The pin definitions are listed below.
Signal name D-Sub Pin
N.C. 1
TxD (output) 2
RxD (input) 3
N.C. 4
GND
5
N.C.
6
N.C.
7
N.C.
8
N.C.
9
HOST (Master- System
Controller)
RT-20 (SLAVE Device)
RS232Ccable (straight) Connector
D-SUB (9pin, male)

4
3. Detailed Description
The RS-232 hardware interface specification between the HOST and theRT-20 is described below.
3-1. Connection format
3-1-1. Physical connection
HOST RT-20
(SerialPort settings)
Baud Rate : 9600bps
DataBits : 8bit
Parity : None
Stop bit : 1bit
Handshaking : None
3-2. Transmission data packet formats
3-2-1. Transmission data packets from the HOST to the RT-20
There are two kinds of transmission data packets that are described below.
3-2-1-1. Command Packets
The Command Packets are provided for the Host Controller to request the RT-20 to perform a specific action.
Start character : ’@’
COMMAND : see “Data Packet COMMAND List”on page 16
End character (CR) : 0Dh
End
0Dh
COMMAND
Start
‘@’
3-2-1-2. Status Request Packets
The Status Request packets are provided for the Host Controller to request the RT-20 to report specific
operating statuses.
Start character : ’@’
Request status : see “Status Request and Status Response Data Packets” on page 11
Request character : ‘?’
End character (CR) : 0Dh
End
0Dh
Requeststatus
Start
‘@’
1
9
‘?’
TxD
RxD
GND
RxD
TxD
GND

5
3-2-2. Response data packets from the RT-20 to the HOST
The RT-20 can respond to theHOST in a synchronous and asynchronous mode. The two different response
packets are described below.
3-2-2-1. ACK/NAK Response Packets
The RT-20 provides an ACK (acknowledge) response to the HOST when the RT-20 has received a correct
command packet, and the HOST command packet has requested no other status data.
Start character : ’@’, ACK : 06h, End character (CR) : 0Dh
The RT-20 will send a NAK response packet if theRT-20 has received an incorrect HOSTcommand packet.
Start character : ’@’, NAK : 15h, End character (CR) : 0Dh
3-2-2-2. Auto Status Feedback Packets
The RT-20 will send to the HOST asynchronous status feedback data packets when applicable RT-20 status
changes. The asynchronous status has been divided into levels or groups. The HOST can enable each of the
status feedback groups independently.
Start character : ’@’
Answer character : see “Status Feedback” on page 14
End character (CR) : 0Dh
End
0Dh
Statusanswer
Start
‘@’
ACK
06h
CR
0Dh
start
‘
@
’
NAK
15h
CR
0Dh
start
‘
@
’

6
3-3. Data Transaction Sequencing and Timing Requirements
3-3-1. Data Packet Transaction Sequencing Requirements
The RT-20/Host DataPacketTransactionscan be described in one of the three following sequences:
• The HOSTsends a command data packet andthe RT-20 responds with anACK or a NAK data packet.
• The HOST sends a status request data packet and the RT-20 responds with the corresponding status
data packet or NAK if therequest is invalid.
• The RT-20 sends an auto status feedback data packet if the corresponding RT-20 status has changed
(The HOSTis not required to respond tothe RT-20).
3-3-2. Data Transaction Timing Requirements
Each of the HOST/RT-20 data transactions must meet thefollowing timing requirements:
• Response packet transmission (ACK, NAK or Status) from the RT-20 will be initiated approximately within
50ms following the end of the HOST command packet and transmission will be completed within 500ms
following the end of the HOST command packet.
• The HOSTshould not transmit a commandor status request data packet until the RT-20 has responded to
the previously sent command. Anew command or status request data packet may be initiated if the RT-20
has been unresponsive for at least 1s.
• The RT-20 will complete an auto status feedback data packet within 500ms.
3-3-3. Specific Requirements forAuto Status Feedback
The following items detail specific requirementsfor theAuto Status Feedback data transactions.
The RT-20Auto Status Feedback has been grouped into three layers: 1, 2 and 3:
• Layer 1 is the highest priority status. Layer 2 is the second highest priority. Layer 3 is assigned the lowest
priority.
• Each layer is independently enabled or disabled by the HOST. The RT-20 will disable all three layers by
default.
• The RT-20 initiates the Auto Status Feedback transaction when the corresponding RT-20 status has
changed.
3-3-4. Example of the transactions
HOST RT-20
TxD RxD
RxD TxD
Example Data Packet Transactions
max.0.5sec
a transaction atransaction
Command
ACKor NAK
Status request
Status
max.0.5sec

7
3-3-5. Examples of HOST/RT-20 handshaking
3-3-5-1. Example of successful handshaking
RT-20HOST
Command
acce
p
table
Request
acce
p
table
Command
A
CK
Status
request
Status
answer
A
uto status
feedback
Changed
status
The RT-20 may reply with an ACK instead of requested status, if the RT-20 cannot send the requested status
immediately.
3-3-5-2. Examples of handshaking errors
RT-20HOST
Command
incorrect
Request
incorrect
Command
NAK
Status
request
NAK

8
3-4. Commands
The following tables detail the available HOST commands.
3-4-1. HOST Command list
Command Reply from RT-20
OFF “PWR:1”
POWER ON “PWR:2” ACK
Toggle “TRY:0”
OPEN “TRY:1”
TRAY CLOSE “TRY:2” ACK
STOP “STP:0” ACK
PLAY “PLY:0” ACK
PAUSE “PPS:0” ACK
SLOW FWD “PSF:0” ACK
SLOW REV “PSR:0” ACK
FASTFWD “PFF:0” ACK
FASTREV “PFR:0” ACK
NEXT “GOT:1” ACK
PREV “GOT:2” ACK
STEP Toggle “PST:0” ACK
SEARCH Toggle “SCH:0” ACK
REPEAT Step “RPT:0” ACK
A-B REPEAT Step “A-B:0” ACK
PROGRAM Toggle “PRG:0” ACK
RANDOM Step “RDM:0” ACK
MARKER Toggle “MRK:0” ACK
+ “PAG:1”
PAGE - “PAG:2” ACK

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Command Reply from RT-20
SETUP Toggle “OSD:0” ACK
TOPMENU Toggle “MNU:1” ACK
MENU Toggle “MNU:0” ACK
SUBTITLE “SBT:0” ACK
AUDIO “AUD:0” ACK
DISPLAY (OSD) Toggle “DIP:0” ACK
Step “DIM:0”
OFF “DIM:1”
DIMMER “DIM:2”
DIMMER (FL/LCD)
ON “DIM:3”
ACK
RETURN “CUR:0”
UP “CUR:1”
DOWN “CUR:2”
LEFT “CUR:3”
CURSOR
RIGHT “CUR:4”
ACK
0 “NUM:0”
1 “NUM:1”
2 “NUM:2”
3 “NUM:3”
4 “NUM:4”
5 “NUM:5”
6 “NUM:6”
7 “NUM:7”
8 “NUM:8”
9 “NUM:9”
NUMBER
+10 “NUM:P”
ACK
ENTER “ENT:0” ACK
CLEAR “CLR:0” ACK
Command Reply from RT-20
Toggle “SCD:0”
SACD
Stereo “SCD:1”
SACD Multi “SCD:2”
SACD MODE
SACD CD “SCD:3”
ACK
HP MODE Toggle “HPM:0” ACK