Lexicon RT-20 Owners manual

RT-20 Universal Disc Player

RS-232 Control Guide

Harman Specialty Group 3 Oak Park, Bedford, MA, 01730-1413 USA

Cus

tomer Service: Telephone: 781-280-0300 | Service Fax: 781-280-0499 | www.lexicon.com

Part No. 070-17224 | Rev 0 | 03/05

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 Confidential unpublished works.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.

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.

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Part No. 070-17224 | Rev 0 | 03/05

T able of Content s

Introduc tion................................................................................................. ................................ .......................................... ....3

1-1.

Purpose........................................................................................................... ..................................... ..............................3

1-2.

Referen ces...................................................... .......................................... ................................ .........................................3

2. Sys tem Des cripti on........................................................................................ ..................................... ....................................3

2-1. Overvie w.............................................................. ........................................... ..................................... ..............................3

2-2. Block Di agram.......................................................................................... ..................................... ....................................3

2-3. RT -20 RS-232 Conne ctor Pin Definition......................................................................................... ...............................3

3. Detai led Des cript ion......................... ............................................... ........................................... .......................................... ....4

3-1. Connection format.................................................................................... ........................................... ..............................4

3-1-1. Physical connection.................................................................... ............................................... ...............................4

3-2. Tran smissi on dat a pa cket fo rmats.......................................................... ........................................... ..............................4

3-2-1. Tran smissi on dat a pa ckets from th e HOST to the RT -20...................................................................... ...............4

3-2-1-1 Com mand Pa cket s................................................................ ........................................... ..............................4

3-2-1-2. S tatus Request Packets............................................... ............................................... ................................. ...4

3-2-2. Respo nse dat a pa cket s from the R T -20 to the HO ST................................................................ .........................5

3-2-2-1. AC K/NAK R espon se Pack ets......................................................... .......................................... ....................5

3-2-2-2. Auto S tatus Feedback Packets....................................................................................... ...............................5

3-3. Data Transaction Sequencing and Timing Requiremen ts....................................................................... ....................6

3-3-1. Data Packe t T ransac tion Se quencin g Requ irement s............................................................................ ...............6

3-3-2. Data T ransa ction T iming R equire ments........................................................................................................ .........6

3-3-3. Specific Requiremen ts for Auto S tatus Feedback..................................................................................................6

3-3-4. Example of the transa ctions............................................................ ........................................... ..............................6

3-3-5. Example s of HOS T/RT - 20 hand shakin g............................................................ ........................................... .........7

3-3-5-1. Example of succ essful handsh aking ..................................................... .......................................... ...............7

3-3-5-2. Example s of han dshakin g erro rs........................................................... ................................................ .........7

3-4. Comman ds................................................................................................... ...................................... ..............................8

3-4-1. HOST Comma nd list.................................................................................................. ..............................................8

3-4-2. Spe cific C ommand s......................................................... ................................................ ......................................10

3-5. S tatus R equest a nd S tatu s Respon se Data Packet s.................................................................................... .............11

3-5-1. HOST S tatus request and S tatus Response/feedback list AST Layer: 1...................................................... ..11

3-5-2. HOST S tatus request and S tatus Response/feedback list AST Layer: 2...................................... ..................11

3-5-3. HOST S tatus request and S tatus Response/feedback list AST Layer: 3...................................... .................12

3-5-4. Special S tatus request and S t atus Response list AST Layer: None.................................................... ............13

3-6. S tatus F eedback................................................................................................... ............................................ ............14

3-7. Data Packet COMM AND Li st.................................................... ...................................................... ...........................16

1. Introduction

1-1. Purpose

This document was written as a reference specific ation 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 R S-232 connector and RT -20 functionality. RT-20 U ser 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 R T -20 is the slave device. The Master-system controller is referred to as the HOST device.

2-2. Block Diagram

HOST (Master- System

RS232C cable (straight)

Controller)

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 N.C. N.C. N.C. N.C.

RT-20 (SLAVE Device)

Connector D-SUB (9pin, male)

3. Detailed Description

The RS-232 hardware interface specification between the HOST and the RT -20 is described below .

3-1. Connection format

3-1-1. Physical connection

HOST RT-20

TxD

RxD

GND

(Serial Port settings) Baud Rate : 9600bps Data Bit s : 8bit Parity : None S top bit : 1bit Handshaking : None

3-2. Transmission data packet formats

3-2-1. T ransmission data p ackets f rom the HOST to the RT -20

There are two kinds of transmission data packet s that are described below .

3-2-1-1. Command Packets

The Command Packets are provided for the Host Con troller to request the RT -20 to perfor m a specific action. Star t character : ’@’ COMMAND : see “Data Packet COMMAND List”on page 16

End character (CR) : 0Dh

Start

‘@

’

3-2-1-2. Status Request Packets

The Status Request packets are provided for the Host Cont roller to request the RT-20 to report specific

operating statuses. Star t character : ’@’ Request status : see “Status Request and S tatus Response Dat a Packets” on page 1 1

Request character : ‘?’ End character (CR) : 0Dh

Start

‘@

’

COMMAND

R equest status

RxD

TxD

GND

End

0D h

End

‘?’

0D h

3-2-2. Response dat a packet s from the RT -20 to the HOST

The RT -20 can respond to the HOST 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

st art

‘

’

ACK

06h

0Dh

The RT- 20 will send a NAK response packet if the RT -20 has received an incorrect HOST command p acket.

Star t character : ’@’, NAK : 15h, End character (CR) : 0Dh

st art

‘

’

NAK

15h

0Dh

3-2-2-2. Auto Status Feedback Packet s

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 . Star t character : ’@’ Answer character : see “St atus Feedback” on page 14

End character (CR) : 0Dh

Start

‘@

’

Status answer

End

0Dh

3-3. Data T ransaction Sequencing and Timing Requirements

3-3-1. Data Packet Tr ansaction Sequencing Requirements

The RT -20/Host Data Packet Transactions can be described in one of the three following sequences:

• The HOST sends a command data packet and the RT -20 respond s with an AC K 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 the request is in valid.

• The RT-20 sends an auto status feedback data packet if the corresponding RT-20 stat us has changed (The HOST is not required to respond to the R T -20).

3-3-2. Dat a Transact ion Timing Requirements

Each of the HOST/RT -20 dat a transactions must meet the following 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 co mmand packet and transmission will be completed within 500ms following the end of the HOST command packet.

• The HOST should not transmit a command or status request data pa cket until the RT -20 has responded to the previously sent command. A new command or status request data packet may be initiated if the RT -20 has been unresponsive for at least 1s.

• The RT -20 will c omplete an auto st atus feedback data packet w ithin 500ms.

3-3-3. Specific Requirement s for Auto S tatus Feedback

The following items detail specific requirements for the Auto S tatus Feedback data tran sactions.

The RT -20 Auto S tatus Feedback has been grouped into three layers: 1, 2 and 3:

• Layer 1 is the highest priority status. Layer 2 is the second hig hest 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 corr esponding RT-20 status has

changed.

3-3-4. Example of the transactions

HOST RT-20

Command

TxD RxD

max. 0.5sec

ACK or NAK

RxD TxD

a transaction a transaction

Example Data Packet Transactions

Status request

max. 0.5s ec

Status

+ 15 hidden pages