Infocus LP790 Reference Guide
Page 3
1 PURPOSE
This document describes the Projector Management Protocol between the Projector and a Computer (Host). The Protocol is
based on a ASCII commands. By using this protocol a Host will be able control the projector on a physical link.
based on a ASCII commands. By using this protocol a Host will be able control the projector on a physical link.
2 SCOPE
The physical link is not defined in this document. Therefore the protocol can either be implemented on top of RS-232, USB,
Ethernet or other forthcoming communication methods.
Ethernet or other forthcoming communication methods.
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.
only one state.
State
A State function performs a set operation from a predefined
list of states. Not all values in the range
have to be legal.
list of states. Not all values in the range
have to be legal.
Adjust
An adjust function is characterized by Maximum >
Minimum. And all the integer values between Minimum and
Maximum are legal.
Minimum. And all the integer values between Minimum and
Maximum are legal.
Query
A query function is a read only function.
Table 1
3.1 Legal Arguments
Each Function type has a set of legal arguments:
Function type
Argument
Comments
State
<decimal number>
Sets the function to the required state.
Adjust
+
Increases the value of the function one step.
Adjust
-
Decreases the value of the function one step.
Adjust
<decimal number>
Sets the value of the function to the specific number.
All
?
Requests current, max and min value of the function.
Execute
E
Executes an action.
All
S?
Returns ‘0’ if function is not supported
Return ‘1’ if function is supported
Return ‘1’ if function is supported
All
C
Returns Current Value
All
X
Return max value
All
M
Returns min value
All
D
Set the function to the default value
Table 2