45
RS-232 commands
Communication Configuration
Visit our website for additional RS-232 settings and information.
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:
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
AAA denotes the command
? denotes the read request
) ends the command
A read command returns the range and the current setting, for example:
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.
RS-232 Port Settings
Setting Value
Bits per second 19,200
Data bits 8
Parity None
Stop bits 1
Flow control None
Emulation VT100
Read Command Examples
Function Command Response
Brightness (BRT?) (96-160,128)
Volume (VOL?) (0-32, 0)
Lamp Hours (LMP?) (0-65534, 42)
LP840-850-860 User's Guide-02.fm Page 45 Friday, February 25, 2005 12:58 PM
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