page 52
Digital Projection E-Vision 6800 3D Series
Remote Communications Guide
INTRODUCTION
Rev A January 2015
Protocol commands
Commands are used to simulate menu operations and determine the settings of the projector, and use the following format:
•
All commands consist of ASCII text strings starting with an asterisk
and ending with an ASCII Carriage Return character
(code 13):
*command operator <value>
•
The
<command>
string determines which setting the command will affect.
•
Spaces are required before the operator and before the value.
•
The
<operator>
string can take one of the following formats:
Command type
<operator>
Description
Set
= <value>
Makes the setting take the
<value>
.
Get
?
Asks what the current value is.
The value is returned as an ASCII text string.
Execute
Performs an action. No operator is entered for this type of command.
Examples
*orientation = 3
sets the orientation to Ceiling Rear (for a celing mounted projector positioned behind the screen)
*aspect.ratio ?
asks what the current aspect ratio is
*zoom.in
commands the projector to zoom in
*orientation=3
is an invalid instruction because of the missing spaces before the operator and the value
Responses
If the command has been successful, the projector response begins with
ack
(“acknowledged”). For example, if the command is
*aspect.
ratio = 1
, the projector will return
ack aspect.ratio = 1
. The projector will then will change the aspect ratio accordingly.
If the command has not been acknowledged, due to a syntax error or another problem, the projector response will be
nack
, followed by a
brief description of the problem.
Notes
To set the default value of a
command, simply enter the
command name and
, without
an operator. For example
*orientation
will set the
orientation to 0 (Desktop Front).
You must wait for the complete
response to a command before
sending another command.
