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Number of Connections
An MTPX Plus switcher can have up to 200 simultaneous TCP connections, including all http
sockets and telnet connections. When the connection limit is reached, the switcher accepts
no new connections until some have been closed. No error message or indication is given
that the connection limit has been reached. To maximize performance of an IP Link device,
the number of connections should stay low and unnecessary open sockets should be closed.
Using Verbose Mode
Telnet connections to an MTPX Plus switcher can be used to monitor for changes that
occur on the switcher, such as front panel operations and SIS commands from other telnet
sockets or a serial port. For a telnet session to receive change notices from the switcher, the
telnet session must be in verbose mode 1 or 3. See the Verbose Mode SIS command on
page 95. In verbose mode 3, the telnet socket reports changes in messages that resemble
SIS command responses.
Host-to-Switcher Instructions
The switcher accepts SIS (Simple Instruction Set) commands through the RS-232 port. SIS
commands consist of one or more characters per command field. They do not require any
special characters to begin or end the command character sequence. Each switcher response
to an SIS command ends 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.
Switcher-initiated Messages
When a local event such as a front panel operation or an IR 501 command string occurs, the
switcher responds by sending a message to the host. The switcher-initiated messages are
listed below (underlined).
The switcher does not expect a response from the host, but, for example, the host program
might request a new status.
(C) COPYRIGHT 20yy, Extron Electronics MTPX, Vx.xx,
60-nnn-01 {day,date, time}
]
The switcher initiates the copyright message when it is first powered on or when a
connection via Internet protocol (IP) is established. Vx.xx is the firmware version number and
60-nnnn-01 is the switcher part number.
NOTE: {Day, date, time} are only reported if the connection is via the LAN port.
Password:
]
The switcher initiates the password message immediately after the copyright message when
the controlling system is connected using TCP/IP or Telnet and the switcher is password
protected. This message means that the switcher requires an administrator or user level
password before it will perform the commands entered via this link. The switcher repeats
the password message response for every entry other than a valid password until a valid
password is entered.
]
Login Administrator
]
]
Login User
]
The switcher initiates the login message when a correct administrator or user password has
been entered. If the user and administrator passwords are the same, the switcher defaults to
administrator privileges.
MTPX Plus Series • Programming Guide 76