Rs-232 Programmer Guide - Extron electronics MLS 100 A User Manual

RS-232 Programmer 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 =
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).
© Copyright 2008, Extron Electronics MLS 100 A, Vx.xx
The MLS sends the copyright message when it first powers on. Vx.xx is the firmware version number.
X! X!
Chn ] (where 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. 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
Using the Command and Response Tables
The command/response tables on the next page list valid command ASCII codes, the MLS responses to the host, and a
description of the command function or the results of executing the command. Unless otherwise indicated (as for the gain
commands), upper and lower case characters may be used interchangeably in the command field.
ASCII to HEX Conversion Table
]
•
The ASCII to HEX conversion table on the left is for use with the
command and response tables.
]
), which signals the end
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