15
CrossPoint / MAV Matrix Switchers • Remote Control
Connection timeouts
The Ethernet link times out and disconnects after a designated
period of time of no communications. By default, this timeout value
is set to five minutes but the value can be changed. See the
command on page 20.
NOTE:
Extron recommends leaving the default timeout at five
minutes and periodically issuing the Query (Q) command to
keep the connection active or disconnecting the socket and
reopening the connection when necessary.
Number of connections
A 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 your switcher, the number of
connections should stay low and unnecessary open sockets
should be closed.
Verbose mode
Telnet connections to a 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 3. See the
on page 20. In verbose mode 3, the Telnet
socket reports changes in messages that resemble SIS command
responses.
Host-to-switcher instructions
The switcher accepts SIS commands through either serial 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.
NOTE:
The table that begins on the next page is a partial
list of SIS commands. For a complete listing, see the
CrossPoint 450 Plus / CrossPoint Ultra / MAV Plus Switcher
User Guide
, chapter 4, “Programmer’s Guide”.
