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MLS 304 Series, MLS 406Series • Serial Communication
4-2
Serial Communication
PRELIMINARY
RS-232/MLC/IR
Tx
RxIR
12V
A
B
C
Transmit (Tx)
Receive (Rx)
Sleeve(s)
+12 V, 0.4 A power output
Ground ( )
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/MLC/IR port. Alternatively, the switcher can be controlled by an optional
MediaLink Controller (MLC) (connected to the same 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 Controllers User’s Manual.
Switcher protocol:
• 9600 baud
• 1 stop bit
• no parity
• no flow control
RS-232/MLC/IR connector 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 = ]), 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).
Boot V1.00, (c) 2003, ? to Enter
(c)Copyright 2004, Extron Electronics, MLS406MA, Vx.xx ]
The MLS sends the boot and copyright messages when it first powers on. Vx.xx is
the firmware version number. The MLS 406MA is used in this example.
Chn X! ] (where X! 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
E23 – Checksum error (for file uploads)