Barco R9040320 User Manual

SIMULATION PRODUCTS

GALAXY WARP™

R9040320

SERIAL COMMUNICATIONS BASIC USER’S MANUAL

31032004 R5976614/00

Barco nv Simulation Products
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Barco nv Simulation Products

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Barco provides this manual ’as is’ without warranty of any kind, either expressed or implied, including but not limited to the implied war­ranties or merchantability and fitness for a particular purpose. Barco may make improvements and/or changes to the product(s) and/or the
program(s) described in this publication at any time without notice.

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publication; these changes are incorporated in new editions of this publication.

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All brand and product names mentioned in this manual serve as comments or examples and are not to be understood as advertising for
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ve holders.

Table of contents

TABLE OF CONTENTS

1. Serial Communications Basics...................................................................................... 3

1.1 SerialCommunicationsProtocol...................................................................................................... 4

1.2 Data Words............................................................................................................................ 6

1.3 Communication Settings .............................................................................................................. 7

1.4 Serial Communications Hardware .................................................................................................... 8

1.5 Serial Communications Syntax ...................................................................................................... 10

2. RS232 Commands ..................................................................................................13

2.1 Dynacolor™, Read...................................................................................................................14

2.2 Dynacolor™, Write ................................................................................................................... 16

2.3 Dynacolor™, Off...................................................................................................................... 18

2.4 Dynacolor™, On...................................................................................................................... 19

2.5 Dynacolor™, Status.................................................................................................................. 20

2.6 Dynacolor™, Execute Linked........................................................................................................ 21

Index ......................................................................................................................23

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Table of contents

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1. SERIAL COMMUNICATIONS BASICS

Overview

• Serial Communications Protocol

• Data Words

• Communication Settings

• Serial Communications Hardware

• Serial Communications Syntax

1. Serial Communications Basics

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1. Serial Communications Basics

1.1 Serial Communications Protocol

Communication Protocol Summary

Like every communication method the serial communication uses a particular protocol (ANSI) which must be respected in order to
allow communication to take place, following table gives a summary of the predefined communication terms.

Start byte \xfe

Projector address

Command byte(s)

Data bytes

Checksum byte

Stop byte \xff

Start Byte

The “Start byte” informs the projector (in case of transmission) or the computer (in case of reception) that a new data transfer will
take place

1

ANSI

American National Standards Institute

Projector Address

The “projector address” defines the address of the computer the projector wants to talk to (in case of transmission) or the address
of the projector that answers (in case of

The maximum number of projectors th

reception).

at can be addressed by one computer is 256.

Command Byte(s)

There is at least one command byte to define the action to be performed. Commands that are not often used or complex commands
can take more than one byte. All command bytes that are sent by the computer to get information out of the projector are repeated
in the answer-data-transf

er of the projector.

Data Bytes (Optional)

Whether the command bytes are followed by one or more data bytes depends on the contents of the command bytes.

Data which contains more than one byte is called a word and can also be signed or unsigned.

Some commands do not require a data field(s).

Checksum Byte

The “Checksum byte” is used to detect errors during transmission or reception

Checksum byte = (projectoraddress + command bytes + Data bytes) Modulo \x100

Stop Byte

The “Stop byte” informs
and that the interpretation of the command and data bytes can start.

the projector (in case of transmission) or the computer (in case of reception) that the data transfer is complete

Acknowledge

If the communication link and if the sent commands can be interpreted by the projector an “ACK” command is sent back. In case the
commands cannot be interpreted a “NACK” command is sent back.

1. optional

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Note

Any command byte, data byte or checksum byte that equals \x80, \xfe, \xff has to be converted!

1. Transmission

- instead of \x80, send \x80 followed by \x00

- instead of \xfe, send \x80 followed by \x7e

- instead of \xff, send \x80 followed by \x7f

2. Reception

- replace \x80 followed by \x00 with \x80

- replace \x80 followed by \x7e with \xfe

- replace \x80 followed by \x7f with \xff

1. Serial Communications Basics

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