Extron electronic MLC 52 Using Simple Instruction Set SIS Commands, Host-to-MLC communications

Using Simple Instruction Set (SIS™) Commands

Simple Instruction set (SIS) commands can be entered on your PC to find out more information about the MLC 52.

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

MLC-initiated messages

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

(C) Copyright 2005, Extron Electronics MLC 52, Vx.xx

The MLC sends the copyright message when it first powers on.

Error responses

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

E10 – Invalid command

E14 – Invalid for this configuration

Using the command/response tables

The command/response tables below and on the following pages list valid command ASCII codes, the MLC’s responses to the host, and a description of the command’s function or the results of executing the command. Upper and lower case characters may be used interchangeably in the command field.

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

ASCII to HEX Conversion Table

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ASCII to Hex conversion table

MLC 52 Series MediaLink Controllers • Serial Communication 5-51