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SIS Communication
and Control
The DSC 301 HD can be configured and controlled via a host computer or other device
(such as a control system) attached to the rear panel RS-232 connector or the front panel
USB port. Control is made using the Extron Simple Instruction Set (SIS) of commands.
Commands can be entered using a Telnet application such as the Extron DataViewer,
available at www.extron.com. See the DataViewer Help file for use.
This section describes SIS communication and control. Topics that are covered include:
• Host to Scaler Communications
• Commands and Responses
The scaler uses a protocol of 9600 baud, 1 stop bit, no parity, and no flow
control and the rear panel remote port RS-232 captive screw connector has
the pin assignments as shown at right.
Host-to-Scaler 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 DSC 301 HD determines that a
command is valid, it executes the command and sends a response to the host device.
All responses from the scaler to the host end with a carriage return and a line feed
(CR/LF = ]), indicating the end of the response character string (one or more
characters).
Scaler-initiated Messages
When a local event such as a front panel selection or adjustment takes place, the
DSC 301 HD scaler responds by sending a message to the host. No response is required
from the host. Example scaler-initiated messages are listed here.
• In X! All ] (where X! is the input number during an input switch).
• Reconfig ] The DSC 301 HD sends this response when a new signal is detected.
• HplgO X@ ] The DSC 301 HD sends this response when a hot plug event on
output X@ is detected.
Copyright Information
] © Copyright 2013, Extron Electronics, DSC 301 HD, Vx.xx, 60-1253-01]
The copyright message is displayed upon connecting to the product via USB or RS-232.
Vx.xx is the firmware version number.
RS-232
Tx Rx G
REMOTE
DSC 301 HD • SIS Communication and Control 20