User manual

J Series Serial Commands Technical Reference Information 1 of 90
020-100796-01 Rev. 1 (10-2011)
J Series Serial Commands
Technical Reference Information
INTRODUCTION
This document describes the serial protocol, consisting of ASCII text messages, used to control an J Series
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
NOTES: 1) Refer to the User Manual provided with the projector for all cable requirements and other
connection details.
2) Some commands are operational only when projector is powered up.
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 four letter subcode and any related data. When a parameter for a
specific source is being accessed, the four 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.