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SIS Commands
This section provides information about the Extron Simple Instruction Set (SIS) commands
that are used to configure the switchers:
• Introduction to SIS
• Symbols Used in this Guide
• Error messages
• Command and Response table for SIS commands
Introduction to SIS
The MSW 4V rs and MSW 4SV rs accept SIS commands from a control device connected
to the RS-232 5-pole, rear panel captive screw connector (see RS-232 connector).
NOTE: The wiring in the RS-232 cables crosses over so that the Tx of one device
connects to the Rx of the other and vice versa.
The RS-232 protocol is 9600 baud, 8 data bit, 1 stop bit, and no parity.
The SIS commands consist of one or more characters per field (a string). No special
characters are required to begin or end a command character sequence. Unless otherwise
stated, upper and lower case characters may be used interchangeably.
When a command is valid, the switcher executes the command and sends a response to
the host device. All responses from the switcher to the host end with a carriage return and
a line feed (CR/LF =
]), which signals the end of the response character string.
Pauses of ten seconds or longer between command ASCII characters result in a timeout.
The command operation is aborted with no other indication.
When a local event (such as a front panel operation or error condition) occurs, the
switcher responds by sending a message to the host. The switcher-initiated messages are
listed below:
The switcher issues the copyright message and the input selected message when it first
powers on. Vx.xx is the firmware version number.
(c) Copyright 2007, Extron Electronics, MSW Series Switchers, Vx.xx]
Vx.xx is the firmware version number.
The switcher sends the Inn message whenever the selected input is changed using the
front panel buttons.
Inn]
The second “n” is the input number.
MSW 4V rs and MSW 4SV rs • SIS Commands 17