InFocus LP 840 RS-232 commands, Communication Configuration, Command Format, RS-232 Port Settings

RS-232 commands

Communication Configuration

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To control this projector via RS-232, connect a null modem cable and set the control system serial port settings to match the following communication configuration:

	RS-232 Port Settings
Setting		Value
Bits per second		19,200
Data bits		8
Parity		None
Stop bits		1
Flow control		None
Emulation		VT100

Command Format

All commands consist of 3 alpha characters followed by a request, all enclosed in parentheses. The request can be a read request (indicated by a "?") or a write request (indicated by 1 to 4 ASCII digits).

A read request example:

(AAA?) where

( starts the command

AAAdenotes the command ? denotes the read request ) ends the command

A read command returns the range and the current setting, for example:

Read Command Examples

Function	Command	Response
Brightness	(BRT?)	(96-160,128)
Volume	(VOL?)	(0-32, 0)
Lamp Hours	(LMP?)	(0-65534, 42)

A write request example:

(AAA####) where (starts the command AAA denotes the command

####denotes the value to be written (leading zeros not necessary)

) ends the command

Some commands have ranges, while others are absolute. If a number greater than the maximum range is received, it is automatically set to the maximum number for that function. If a command is received that is not understood, a "?" is returned. With absolute settings, "0" is off, 1-9999 is on. The one excep- tion is the Power command, where 0 is off and 1 is on.

To assure the projector can process a command, wait 3 seconds before enter- ing the next command.

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