User's Manual

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.

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