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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 MLC/RS-232 Power port.
Alternatively, the switcher can be controlled by an optional
MediaLink Controller (MLC) (connected to the MLS's
MLC/RS-232 Power port), or by an RS-232 device acting
through the MLC. The control device (host) can use either the
Extron Simple Instruction Set (SIS
control/configuration program for Windows
use and setup of a system that includes a MediaLink Controller,
see the MediaLink Controllers User's Manual.
MLC/RS-232
POWER
MLS 100 Series
Switcher
MLC/RS-232
A B
Power Port
MLC/RS-232 Power port pin assignments
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 =
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 2002, Extron Electronics MLS 100 Series, V0.08
The MLS sends the copyright message when it first powers on.
Vx.xx is the firmware version number. The MLS 102 VGA is
used in this example.
Chn
(where
is the input number)
X1
X1
The MLS sends this response when an input is switched.
MediaLink
™
VersaTools
©
4-2
™
) commands or the graphical
®
. For details on
The switcher protocol is
9600 baud
1 stop bit
no parity
no flow control.
The MLC/RS-232 Power
+12 VDC
3.5 mm, 5-pole captive screw
Ground ( )
connector's pin assignments
B
Receive (Rx)
A
Transmit (Tx)
are shown at left.
), which signals the
Switchers • Serial Communication
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/response tables
The command/response tables on the next page list valid
command ASCII codes, the MLS's responses to the host, and a
description of the command's 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
ASCII to Hex conversion table
Symbol definitions
= CR/LF (carriage return/line feed)
(hex 0D 0A)
•
= Space
= Escape key
Esc
= Specific input number
X1
(0 – 4 maximum)
0 = no connection
1 = input 1 & Aux/Mix
2 = input 2 & Aux/Mix
3 = input 3 & Aux/Mix
4 = input 4 (audio only) & Aux/Mix
= Audio gain (per input)
X2
0 to 24; 0 dB through +24 dB in 1 dB
steps
= Audio attenuation (per input)
X3
0 to 18; 0dB through -18 dB in 1 dB
steps)
™
©
MediaLink
VersaTools
Switchers • Serial Communication
The ASCII to
HEX conversion
•
table at left is
for use with the
command/
response tables.
= Input to be adjusted (1 – 4)
X4
1 = input 1
2 = input 2
3 = input 3
4 = input 4
= Audio gain/attenuation value
X5
(-18 through +24)
= Volume adjustment range: 0%
X6
(90 dB attenuation) to 100%
(0 dB attenuation).
Adjustment increments are
1 dB for steps from 1% to 40%
volume. Adjustments are in
0.5 dB increments from 41%
to 100% volume.
= On/off status
X7
0 = off/disable
1 = on/enable
= Switcher firmware version (listed
X8
to two decimal places e.g.: x.xx)
4-3
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