Sis Programming And Control; Host-To-Switcher Communications; Switcher-Initiated Messages - Extron electronics SW2 USB User Manual

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
Communication" in the "Installation" section for information on connecting to this port).
You 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 or
HyperTerminal.

Host-to-Switcher Communications

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 (
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
firmware version number.
NOTE:
Host-to-Switcher Communications
Using the Command and Response Table
Command and Response Table for SIS Commands
= ]), which signals the end of the response character string. A string is one or
CR/LF
Copyright 20nn, Extron Electronics SWn USB [Plus], Vn.nn
is the switcher model number as well as the number of inputs, and
SWn
This message is displayed only when power is applied to the switcher while it is
connected to the computer.
SW USB Series • SIS Programming and Control
"Wiring for RS-232
is the
Vn.nn
23