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Using SIS Commands
Simple Instruction Set (SIS) commands can be entered on your computer, using a utility
such as Extron DataViewer or HyperTerminal, to find out more information about the
MLC 52, to toggle display power or front panel lock state, or to reset the unit.
Host-to-Controller Communications
SIS commands consist of strings 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.
Most responses from the MLC 52 to the host end with a carriage return and a line feed
(CR/LF =
]
), which signals the end of the response character string.
Controller-initiated messages
When a local event such as a front panel button press takes place, the MLC 52 responds
by sending a message to the host, indicating what selection was entered. No response is
required from the host.
The MLC sends the following copyright message only when it first powers on.
(c) Copyright 20nn, Extron Electronics, MLC 52, Vn.nn, 60-100n-nn
where Vn.nn is the firmware version number and 60-100n-nn is the MLC 52 model
number.
Error Responses
If the MLC 52 is unable to execute a command it receives because the command is
invalid or contains invalid parameters, the controller returns an error response to the host.
This response consists of the letter “E” followed by a number and a carriage return with a
line feed. The following error response codes can be returned:
E10 – Invalid command or parameter
E14 – Not valid for this configuration
Using the Command and Response Table
The command and response table on the following pages lists valid ASCII command
codes, the responses of the MLC to the host, and a description of the command function
or the results of executing the command. The ASCII to Hex Conversion Table below is for
use with the command and response table.
ASCII to Hex Conversion Table
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MLC 52 MediaLink Controllers • Serial Communication 57