Pioneer PRV LX1 User Manual 4

PRV-LX1

RS-422A Command

Protocol Manual

March 2005

Version 3.02

TP #T502201 All Rights Reserved

Table of Contents

1.0 FOREWORD..................................................................................2

2.0 COMMUNICATION SIGNAL..............................................................3

3.0 CABLING .....................................................................................3

4.0 COMMAND BLOCK FORMAT...........................................................4

5.0 COMMAND TABLE.........................................................................6

6.0 COMMAND FORMATS ....................................................................7

PRV-LX1 RS-422A Protocol

7.0 PROCEDURE FOR ISSUING COMMAND...........................................14

8.0 PRODUCT-SPECIFIC NOTES.........................................................16

8.1 Recording De lay..............................................................................................................16

8.2 Playback Delay................................................................................................................17

8.3 PRV-LX1 as Recording Device .......................................................................................17

8.4 PRV-LX1 as the Source Device......................................................................................17

9.0 APPENDIX ..................................................................................18

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form or by any means now known or hereafter invented including, but not limited to, any electronic, mechanical, photocopying and
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Information in this document is subject to change without notice.

Copyright (c) 2005 Pioneer Electronics (USA) Inc.

Document No. PRVLX1_RS422A_CPM
Printed in the United States of America.

Mention of third-party products is for informational purposes only and contributes neither an endorsement nor a recommendation. Pioneer
assumes no responsibility with regard to the performance or use of these products.

No investigation has been made of common-law trademark rights in any word. Words that are known to have current registrations are
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product's fitness for any particular purpose.

Every precaution has been taken in the preparation of this manual. Although we tried to thoroughly check that all instructions and
information in this manual are accurate and correct, Pioneer can not be and is not responsible, in whole or in part, for any damage or loss
to your data and/or equipment that results from your use of this document or from any information contained herein including, but not
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Page 1 of 18

1.0 Foreword

The PRV-LX1 can be controlled externally using RS-422A commands. Control is applied through the
REMOTE IN and REMOTE OUT D-Sub 9 connector on the rear panel. Set the RS-422A REMOTE
controls through the main menu. Press the Function button on the PRV-LX1’s front panel to access the
menu. Control Settings are accessed through the Setup menu.

PRV-LX1 RS-422A Protocol

The REMOTE IN connector is used when controlling this unit with an external d evice. The REMOTE
OUT connector is used for external control with this unit.

Note: This document is valid for PRV-LX1 System Version 3.01/1.04 or later/

Page 2 of 18

2.0 Communication Signal

The PRV-LX1 conforms to EIA RS-422A and includes a full duplex communication channel. The transfe r
speed is 38.4kb per second.

Data Format:
Start Bit: 1 bit
Data: 8 bits
Parity (ODD): 1 bit
Stop Bit: 1 bit

3.0 Cabling

Pin Master Slave

1 Ground Ground
2 RX- TX­3 TX+ RX+
4 Xmit Common Rcv Common
5 Spare Spare
6 Rcv Common Xmit Common
7 RX+ TX+
8 TX- RX­9 Ground Ground

PRV-LX1 RS-422A Protocol

Page 3 of 18

4.0 Command Block Format

The controlling device and the PRV-LX1 communicate through the interchange of comma nd blocks. The
bytes in each command block are assigned as follows:

CMD-1

(MSD)

• CMD-1/DATA COUNT CMD-1 is the upper 4 bits, DATA COUNT is the lower 4 bits

• CMD-2

• DATA-1 up to DATA-N, where n is the value in data count

• CHECKSUM

CMD-1
Indicates the function and direction of the command:

0 System Control (Controller -> PRV-LX1)
1 Return for 0, 2, or 4 of cmd-1 (PRV-LX1-> Controller)
2 Transport Control (Controller -> PRV-LX1)
4 Preset/Select Control (Controller -> PRV-LX1)
6 Sense Request (Controller -> PRV-LX1)
7 Sense Returned (PRV-LX1-> Controller)
E PRV-LX1 Original Command (Controller -> PRV-LX1)
F PRV-LX1 Original Return (PRV-LX1->Controller)

Data

Count
(LSD)

1 Byte 1 Byte 1 Byte 1 Byte 1 Byte

CMD-2 Data-1

PRV-LX1 RS-422A Protocol

Data-15

(MAX)

Checksum

DATA COUNT
Indicates the number of bytes (maximum 15) inserted between CM D-2 and CHECKSUM

CMD-2
Designates the command

(refer to the Command Table for definitions)

DATA-1 to DATA-N
Data that corresponds to those indicated by the command

(refer to the Command Table for data formats)

CHECKSUM
Lower eight bits of the sum of the bytes in the command block

Communications Protocol
The controlling device initiates the communication. PRV-LX1 returns a response within 9 milliseconds.
The response may be:

• NAK + Error Data : undefined command or communications error

• COMMAND + Data : received a command that requests data

• ACK : received a command that requests no data

Page 4 of 18

PRV-LX1 RS-422A Protocol

The controller must ensure that no more than a 10 msec lapse occurs between bytes in a command
block.

The controller must immediately stop sending data when it receives a NAK + Error Data message. The
unit must wait at least 10 msec before resending the command.

The controller should wait at least 10msec to receive a response from the PRV-LX1. The unit should not
send another command during this time.

When the controller does not receive a response from the PRV-LX1 within the 10 msec timeout, it
assumes that communication has ceased and sends the command again.

• Error descriptions are listed in this manual under the section entitle Command Formats
If the PRV-LX1 detects a communication error, it sends a NAK and an error code to the controller.

Page 5 of 18