Serial Communication

The QSD 204 can be remotely controlled via a host computer or other device (such as a control system) attached to the rear panel Remote connector. The control device (host) can use either Extron’s Simple Instruction Set (SIS) commands or the graphical control program for Windows.

The decoder uses a protocol of 9600 baud, 1 stop bit, no parity, and no flow control.

The rear panel RS-232 9-pin D connector has the following pin assignments:

Pin

RS-232 function

Description

5

1

 

 

 

1

Input #1

Contact closure

 

 

2

Tx

Transmit data

 

 

3

Rx

Receive data

9

6

4

Input #2

Contact closure

DB9 Pin Locations

5

Gnd

Signal ground

Female

6

Input #3

Contact closure

 

 

7

Input #4

Contact closure

 

 

8

No connection

 

 

9

No connection

 

 

RS-232 Programmer’s Guide

Host-to-decoder 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 QSD 204 determines that a command is valid, it executes the command and sends a response to the host device. All responses from the decoder to the host 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.

Decoder-initiated messages

When a local event such as a front panel selection or adjustment takes place, the QSD 204 decoder responds by sending a message to the host. No response is required from the host. The decoder-initiated messages are listed here (underlined).

(C) Copyright 2002, Extron Electronics, QSD 204, Vx.xx

The QSD 204 sends the copyright message when it first powers on. Vx.xx is the firmware version number.

C hn X1 (where X1 is the input number)

The QSD 204 sends this response when an input is switched. C = both audio and video were switched.

Error responses

When the decoder receives a valid SIS command, it executes the command and sends a response to the host device. If the QSD 204 is unable to execute the command because the command is invalid or it contains invalid parameters, it returns an error response to the host.

The error response codes and their descriptions are as follows:

E01 – Invalid input channel number (the number is too large)

E10 – Invalid command

E11 – Invalid preset number

E13 – Invalid value (the number is out of range/too large)

E17 – Illegal command for this signal type.

3-2 QSD 204 • Serial Communication

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Extron electronic QSD 204 D manual Serial Communication, RS-232 Programmer’s Guide, Host-to-decoder communications

QSD 204, QSD 204 D specifications

Extron Electronics has established itself as a leader in professional AV technology, and the QSD 204 series is a testament to this innovation. The QSD 204 and QSD 204 D are powerful presentation switchers designed for seamless connectivity and enhanced video performance in various AV applications.

One of the main features of the QSD 204 is its capability to switch up to four input signals to a single output, providing flexibility in managing multiple sources. This is particularly beneficial in conference rooms, educational institutions, and event spaces, where different content sources need to be showcased efficiently. The switcher's compact design ensures it can fit easily into any AV setup without taking up excessive space.

The QSD 204 is equipped with Extron's renowned video processing technology, ensuring high-quality signal transmission with minimal distortion. It supports various video formats, including SD, HD, and even UHD signals, up to 4K resolution, accommodating a wide range of devices, from legacy equipment to modern sources. The automatic input signal scaling feature also allows for a hassle-free experience, as it adjusts the input resolution to match the output requirements, eliminating resolution mismatch issues.

Another hallmark of the QSD 204 series is its robust integration capabilities. The QSD 204 and QSD 204 D come with various control options, including RS-232 and Ethernet, facilitating easy integration into larger control systems. This feature is pivotal in environments where centralized control is necessary, enabling seamless operation through an intuitive user interface.

Moreover, the QSD 204 D variant provides additional features such as built-in audio de-embedding. This functionality allows users to extract audio signals from the video stream for independent processing or amplification. This is especially useful in professional settings where audio clarity is as crucial as video quality.

The QSD 204 and QSD 204 D are designed with reliability in mind, featuring redundant power supply options for critical AV environments. In addition, they come with Extron's industry-leading support and warranty, ensuring that users have access to top-notch customer service and backup.

With their combination of advanced technology, robust functionality, and exceptional reliability, the Extron QSD 204 and QSD 204 D are ideal solutions for any professional AV setup, delivering high performance and ease of use across a variety of applications. Whether it's for corporate settings, educational institutions, or live events, these presentation switchers are geared to meet the demands of modern AV integration.