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Matrix StIM™ WQ/SIM WQ User Manual 77
020-100883-01 Rev. 2 (06-2013)
Serial Communication
This document describes the serial communication protocol, consisting of ASCII text messages, used
to control a Matrix StIM / SIM WQ projector remotely.
Connection and Use
Once you have connected your computer to either the RS232 IN or RS422 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
Message Formats
• Set: A command to set a projector parameter at a specific level, such as changing to a certain
input.
• Request: A request for information, such as what input 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.
i
See
Matrix StIM™ WQ/SIM WQ Specifications
on page 127 for all cable requirements
and other connection details. Some commands are operational only when projector is
powered On.