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Connection Timeouts
The Ethernet link times out 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
Configure port timeout SIS commands on page 69.
NOTE: Extron recommends leaving the default timeout at 5 minutes and periodically
issuing the Query (Q) command to keep the connection active. If there are long idle
periods, Extron recommends disconnecting the socket and reopening the connection
when another command must be sent.
Number of Connections
A FOX matrix 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,
keep the number of connections low and close unnecessary open sockets.
Using Verbose Mode
Telnet connections to a FOX matrix 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 69. 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 either serial port and
the LAN 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.
When a command is valid, the unit executes it and sends a response to the host device.
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.
FOX Matrix 3200 and 7200 Switchers • Programming Guide 55