Introduction; Connection And Use; Understanding Message Format - Christie Entero RPMWU User Manual

Appendix C: Serial Command Overview
C.1 Introduction
This document describes the serial protocol, consisting of ASCII text messages, used to control an Entero
projector remotely.
C.1.1 Connection and Use
Once you have connected your computer to either the RS-232 IN or RS-422 IN port (depending on which
standard is supported by your computer) or to the ETHERNET port on a projector, you can remotely access
projector controls and image setups, issue commands or queries, and receive replies. Use these bi-directional
messages to:
• Control multiple projectors
• Obtain a projector's status report
• Diagnose performance problems
Refer to
NOTES: 1)
commands are operational only when projector is powered up.
C.2 Understanding Message Format
Messages can be one of three types:
• Set - A command to set a projector parameter at a specific level, such as changing to a certain channel.
• Request - A request for information, such as what channel is currently in use.
• Reply - The projector returns the data in response to a request or as confirmation of a command.
All "Remote Control" information passes IN and OUT of the projector as a simple text message, consisting of
a three letter command code, an optional 4-letter subcode, and any related data. When a parameter for a
specific source is being accessed, the 4-letter subcode will be added on to the Command code. A number of
optional features (message acknowledges, checksums, and network addressing) can be included.
Generally, most commands include 0 or 1 data fields or parameters. Where applicable, a message may expand
to include additional parameters of related details.
The smallest step size for any parameter is always 1. For some controls (i.e. Size) the value displayed on the
screen has a decimal point. (e.g. 0.200 to 4.000) In this case, the values used for the serial communications is
an integer value (e.g. 200 to 4000), not the decimal value seen on the screen.
Regardless of message type or origin, all messages use the same basic format and code. Opening and closing
round brackets (parentheses) surround each message, refer to Table C.1.
Entero RPMWU/RPMSP/RPMHD-LED01 User Manual
020-100367-05 Rev. 1 (06-2012)
Section 7 Specifications
for all cable requirements and other connection details. Some
2)
C-1