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SIS Programming
and Control
This section describes the connection through which the SW USB switchers can be
configured and controlled remotely via SIS commands, and describes the commands that
are available. Topics include:
•
•
•
The SW USB can be remotely set up and controlled via a host computer or other device
(such as a control system) that is attached to the rear panel RS-232 port (see
RS-232 Communication
can issue Simple Instruction Set (SIS) commands to the switcher using your computer
RS-232 interface with a communication software program such as Extron DataViewer.
Host-to-Switcher Communication
SIS commands consist of one or more characters per field. No special characters are
required to begin or end a command sequence. When the SW USB determines that a
command that was entered is valid, it executes the command and sends a response to the
host device.
Most responses from the SW USB to the host computer end with a carriage return and a
line feed (CR/LF = ]), which signals the end of the response character string. A string is
one or more characters.
Switcher-initiated Messages
When a local event such as a front panel selection takes place, the switcher responds by
sending a message to the host, indicating what selection was entered. No response is
required from the host.
The switcher sends the following copyright message when it first powers on.
©
where SWn is the switcher model number as well as the number of inputs, and Vn.nn is the
firmware version number.
NOTE: This message is displayed only when power is applied to the switcher while it is
Host-to-Switcher Communication
Using the Command and Response Table
Command and Response Table for SIS Commands
on page 11 for information on connecting to this port). You
Copyright 20nn, Extron Electronics SWn USB [Plus], Vn.nn
connected to the computer.
SW USB Series • SIS Programming and Control
Wiring for
27
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