MLC 104 IP Plus Series • SIS
™
Programming and Control
70
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 MLC 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
If you are communicating with the MLC via RS-232 or a
Telnet connection, when
a local event such as a 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.
Chn
X!]
(where
X!
is the input number)
The unit sends this response when an input is switched.
Vol
X*]
(where
X*
is the volume step number)
The unit sends this response when the volume knob is rotated.
(c) Copyright 2008, Extron Electronics, MLC 104 IP PLUS, Vx.xx, 60-818-00
]
Day, DD Mon YYYY HH:MM:SS
]
V
x.xx
is the firmware version number.
Example:
(c) Copyright 2008, Extron Electronics, MLC 104 IP PLUS, V1.03, 60-818-00
Tue, 30 Apr 2017 14:34:31
The MLC sends the boot and copyright messages under the following circumstances:
•
If the MLC is off and an RS-232 connection is already set up (the PC is cabled to the
MLC and a serial terminal emulation program such as DataViewer or HyperTerminal is
open), the connected unit sends these messages via RS-232 when it is first powered
on.
•
If the MLC is on, it sends the boot and copyright messages when you first open a Telnet
connection to the MLC. The day of the week, date, and time are displayed if the unit is
connected via Telnet, but not via RS-232. If you use a Telnet connection, the copyright
message, date, and time may be followed by a password prompt.
Additional messages may be sent by the MLC in response to front panel selections and
volume adjustments and when scripts are executed during scheduled events.
Password Information
The “
]
Password:
” prompt requires a password (administrator level or user level) followed
by a carriage return. The prompt is repeated if the correct password is not entered.
If the correct password is entered, the unit responds with “
]
Login Administrator
]
”,
“*****
]
Login Administrator
]
”, or “****
]
Login User
]
”, depending on the
password entered. If passwords are the same for both administrator and user, the unit
defaults to administrator privileges.
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