Serial Communication

The MediaLink switcher can be remotely set up and controlled via a host computer or other device (such as a control system) attached to the rear panel RS-232/ Contact Closure port. Alternatively, the switcher can be controlled by an optional MediaLink Controller (MLC 206) (connected to the MLS’s MLC/IR port) or by an RS-232 device acting through the MLC. The control device (host) can use either Extron’s Simple Instruction Set (SIS) commands or the graphical control program for Windows. For details on use and setup of a system that includes a MediaLink Controller, see the MediaLink Controller User’s Manual.

The switcher 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

Contact closure

1

–

Input 1

Input 1

2

Tx

Transmit data

–

3

Rx

Receive data

–

4

–

Input 2

Input 2

5

Gnd

Signal ground

–

6

–

Input 3

Input 3

7

–

Input 4

Input 4

8

–

Input 5

Input 5

9

–

Input 6

Input 6

 

 

 

 

5 1

96

DB9 Pin Locations

Female

RS-232 Programmer’s Guide

Host-to-MLS 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 MLS determines that a command is valid, it 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. A string is one or more characters.

MLS-initiated messages

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

(c)Copyright 2001, Extron Electronics, MediaLink Switcher MLS506SA, Vx.xx The MLS sends the copyright message when it first powers on. Vx.xx is the firmware version number. The MLS 506SA is used in this example.

C hn X1 (where X1 is the input number)

The MLS sends this response when an input is switched.

Error responses

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

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

E14 – Invalid for this configuration.

4-2 MediaLink Switchers • Serial Communication

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Extron electronic MLS 506MA, MLS 506SA, MLS 306 Serial Communication, RS-232 Programmer’s Guide, Host-to-MLS communications
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MLS 306, MLS 506MA, MLS 506, MLS 506SA specifications

Extron Electronics, a leading provider of AV control and signal distribution solutions, offers a range of versatile and user-friendly products. Among these, the MLS 306, MLS 506SA, MLS 506MA, and MLS 506 stand out as robust multimedia learning solutions designed to meet the diverse needs of educational environments.

The MLS 306 is particularly designed for smaller classrooms, providing essential AV capabilities in a compact format. It features user-friendly control capabilities that allow teachers to easily manage presentations and multimedia content with minimal technical know-how. The MLS 306 includes multiple input options, supporting various devices such as computers, document cameras, and DVD players. This model emphasizes efficiency and practicality, making it an ideal choice for contemporary educational settings.

For larger classrooms or comprehensive AV setups, the MLS 506 series comes into play. The MLS 506SA (Simple AV) model is tailored for straightforward AV applications, featuring intuitive control interfaces that allow users to easily switch between sources and manage audio and video output. This model ensures seamless integration with other AV equipment, providing a user-friendly experience ideal for instructors focused on effective teaching.

In contrast, the MLS 506MA (Media AV) version expands capabilities for more complex multimedia environments, supporting additional inputs and outputs for advanced AV systems. Its advanced functionality includes the ability to control lighting and other environmental factors, enhancing the learning experience by creating an optimal classroom setting. With customizable presets, educators can quickly adapt the environment for various activities.

The standard MLS 506 model serves as a comprehensive solution, offering a blend of advanced control and connectivity features. This model stands out for its integration of Extron’s industry-leading technologies, including GlobalViewer Enterprise software, allowing for remote monitoring and management of AV systems over the network. This capability is particularly beneficial for IT administrators managing multiple classroom environments.

All models in the MLS series feature robust reliability and are built with Extron’s commitment to high-quality design. Moreover, they include user-friendly interfaces, ensuring that both educators and students can focus on learning without being hindered by complicated technology. Collectively, the Extron MLS 306, MLS 506SA, MLS 506MA, and MLS 506 represent a significant advancement in educational technology, bridging the gap between teaching and technology for enhanced learning experiences.
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