Remote Control Of The Touch Panel Controller; Understanding Ascii Message Formats; Message Components And Structure - Christie CP2000-SB User Manual

Section 1: Introduction
3.6

Remote Control of the Touch Panel Controller

Most TPC projector functions can be controlled remotely, typically at a controller, via simple bi-directional
ASCII messaging on an Ethernet communication link.
WHAT SETUP IS NEEDED? To control these TPC functions remotely via your own controller, you must
open an Ethernet socket between your controller and the valid TPC address. Refer to
Shutdown for complete instructions. Note that only one physical connection is permitted at any given time, and
access to remote functions may be limited by the installer. Do not use an RS-232 (serial) link.

3.6.1 Understanding ASCII Message Formats

All remote control information passes in and out of the TPC as simple messages consisting of command code
and any data related to it. Such messages can be a command to set a projector parameter at a specific level,
such as changing to a certain channel. Or the controller can request information, such as what channel is
currently in use-the projector then returns the data in a reply message. Regardless of message type or origin, all
messages use the same basic format and code as shown in Figure 3-40. Where applicable, a message can
expand to include additional parameters of related data.
Figure 3-40 The 3 Message Formats (shaded message is from proj.)

3.6.2 Message Components and Structure

START AND END OF MESSAGE: Every message begins with the "("character and ends with the ")"
character. Note that if the start character is received before an end character of the previous message, the partial
(previous) message is discarded.
FUNCTION CODE: The function you wish to work with, such as channel switching or picture mute, is
represented by a three-character ASCII code (A-Z, upper or lower case). This function code appears
immediately after the leading "(" that starts the message.
REQUEST/REPLY SYMBOL: If the controller is requesting information from the projector, a question
mark (?) appears directly after the function code. If the projector is replying, an exclamation mark (!)appears
directly after the function code. For set messages, neither of these characters appear-the code is followed by the
data itself (see next paragraph).
3-52
Section 3.6.6 Setup and
CP2000-SB User Manual
020-100162-06 Rev. 1 (03-2014)