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Communication Protocol

This section describes how to use the communication protocol to control projectors remotely.

When the projects are connected to either RS232 or LAN you can control the projectors through this ASCII based protocol.

Note: Some commands will generate OSD feedback. This can be turned off from the projector’s menu system or by setting

“OSDC” to value 0 (OSD off) or value 1 (OSD show only warnings).

Timing

General timing constraints:

• Wait30secondsafterpoweronbeforesendingnextcommand.

• Waitforresponsebeforesendingnextcommand.

• Minimum2secondsdelaybeforeresendingifnoresponsereceived.

• Minimum500msdelaybetweencommands.

• Minimum5secondsdelayaftersending20commands

Overview

The protocol has the following deﬁnition:

HEADER SEPARATOR ADDRESS SEPARATOR MESSAGEBODY TERMINATOR

1 byte 1 byte 1 -3 bytes 1 byte N bytes 1 byte

Field Description Comment

Header ASCII character ‘:’ Required

Separator ASCII character ‘space’ Optional

Address 1 – 3 bytes address Optional

Terminator CRcarriagereturn(0x0D) Required

Message body

The message body structure is as follows:

MNEMONIC SEPARATOR] MODIFIER SEPARATOR VALUES

1 byte 1 byte 1 -3 bytes 1 byte N bytes

Field Description Comment

Mnemonic 4 bytes key identiﬁer, not case sensitive Required

Modifer Single char symbol Optional

Values Nbytesvalue(max6bytes) Optional

Target Nbytesvalue(max4bytes) Optional

Separator ASCII character ‘space’ Optional

Mnemonic

TheMnemonicis4byteskeyidentier,knowastheASCIIcommand.

Example:POWR,SABS,IDVI

Modiﬁers

R Relativechange.Valuegivenwillberelativetotheexistingvalue.

Example::BRIGR10willincreasebrightnesswith10steps

A Request acknowledges. This modiﬁer is only used to read back

the result of the command.

Default all commands send acknowledges so this will not be

necessary.

Default all commands send acknowledges so this will not be

necessary.

? Get current value

?M Getmaximumvalue

?N Get minimum value

?D Get default value

?S Get default step value

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