Serial Communication

The VSC 75 can be controlled by a host computer or other control device via an RS-232 connection with a protocol of 9600 baud, 1 stop bit, no parity, and no flow control. The control device (host) can use either Extron’s Simple Instruction Set (SIS) or the graphical control program for Windows.

5	1
	The rear panel RS-232 9-pin D connector has
9 6	the following pin assignments:
DB9 Pin Locations
Female
Pin	RS-232 function	Description
1	–	Not used
2	Tx	Transmit data
3	Rx	Receive data
4	–	Not used
5	Gnd	Signal ground
6	–	Not used
7	–	Not used
8	–	Not used
9	–	Not used

RS-232 Programmer’s Guide

SIS commands consist of one or more characters per field. No special characters are required to begin or end a command sequence. When the VSC 75 determines that a command is valid, it executes the command and sends a response to the host device. All responses from the scan converter 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.

VSC-initiated messages

When a local event such as a front panel selection or adjustment takes place, the VSC 75 responds by sending a message to the host. No response is required from the host. The VSC-initiated messages are listed here (underlined).

(C)COPYRIGHT 2000, EXTRON ELECTRONICS VSC 75,

Vx.xx

The VSC 75 displays the copyright message when it first powers on. Vx.xx is the firmware version number.

RECONFIG The VSC 75 sends the Reconfig message when the input source is changed and when changes have been made to one or more of the settings.

VSC error responses

When the VSC 75 receives a valid SIS command, it executes the command and sends a response to the host device. If the VSC 75 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:

E09 – Invalid function number (the number is too large) E10 – Invalid command

E13 – Invalid value (the number is out of range).

Time-out

A delay of 10 or more seconds between command sequence characters causes a time-out. The command operation is stopped, and there is no indication that a time-out occurred.

Using the command/response table

The command/response table on the next page lists valid command ASCII codes, the VSC 75’s responses to the host, a description of the command’s function or the results of executing the command, and an example of each command. Lower case characters are acceptable in the command field only where indicated.

The ASCII to HEX conversion table below is for use with the command/response table.

ASCII to HEX Conversion Table

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VSC 75 Serial Communication

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VSC 75 specifications

The Extron VSC 75 is a versatile and powerful video scaling solution designed for a variety of professional AV applications. This device is particularly suited for environments such as classrooms, conference rooms, and auditoriums, where high-quality video is crucial for effective communication and presentations. The VSC 75 offers an impressive combination of features and technologies that enhance its functionality and ease of use.

One of the main features of the VSC 75 is its advanced video scaling capability. The device can accept a wide range of input resolutions, including standard and high-definition video sources, and transform them to fit the desired output format. This makes it a flexible solution for integrating various AV sources into a single system. The VSC 75 supports video formats up to 1080p, ensuring crisp and clear image quality across all applications.

The Extron VSC 75 utilizes state-of-the-art processing technologies to deliver high-performance video scaling. It features a 10-bit video processing engine that ensures smooth and accurate scaling, reducing artifacts during the transition from one resolution to another. This level of processing is particularly important for professional presentations, where visual fidelity is paramount. Additionally, the device incorporates sophisticated algorithms for noise reduction and image enhancement, which improve the overall picture quality.

Another key aspect of the VSC 75 is its user-friendly interface. The device includes an intuitive front panel with a variety of buttons and indicators that facilitate easy operation. Furthermore, it supports multiple control options, including RS-232 and contact closure, allowing for seamless integration into existing AV systems. This flexibility makes it a popular choice for system integrators.

In terms of connectivity, the Extron VSC 75 offers a comprehensive range of inputs and outputs. It features HDMI, VGA, and composite video inputs, as well as a loop-through output for connecting additional displays. This range of connectivity options ensures compatibility with most AV equipment, making the VSC 75 a highly adaptable solution.

In conclusion, the Extron VSC 75 is a powerful video scaler that combines advanced scaling technologies with a user-friendly design. Its ability to accept multiple input formats, support for high-definition resolutions, and various connectivity options make it an excellent choice for enhancing video presentations in any professional environment.