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2 general, 3 function type, 4 protocol messages – Ask Proxima C20 User Manual

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Projector Control

C20 / C60

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Version 1.

2 GENERAL

This document describes the Communication Protocol between a Proxima® Projector and a Computer
(Host). By using this connection the Host will be able control the projector.

This document are HEX command based only and a regular Terminal program like hyperterminal
etc. can therefore not directly be used unless the COM port are activated by the user. This document
is aimed at control systems in general which is HEX based.

3 FUNCTION TYPE

The Function is grouped in four different function types:

Function type

Comments

Execute

An execute function executes an action on the
projector, i.e. only one state.

State

An State function performs a set operation from a
predefined list of states. Not all values in the range
have to be legal.

State String

As state but returns ASCII strings

Adjust

An adjust function is characterized by Maximum >
Minimum. And all the integer values between Minimum
and Maximum are legal.

Table 4

4 PROTOCOL MESSAGES

4.1 Message Formats

The message is always divided in a header and a body part:

Message Head (7Byte)

Message Body (6Byte)

4.1.1 Message Head

The message head has the following structure:

Byte 0

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Magic Number

Body size

CRC

0xBE

0xEF

0x80

0x06

0x00

CRC_lo

CRC_hi

Table 5