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DXP DVI Pro and DXP HDMI Series • SIS Configuration and Control 49
Connection Timeouts
The Ethernet link times out after a designated period of no communications. By default,
this timeout value is set to 5 minutes, but the value can be changed (see the Configure
current port timeout command in the Command and Response Table for IP-specific SIS
Commands, 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 and reopening the connection
when another command must be sent.
Number of Connections
A DXP switcher can have up to 200 simultaneous TCP connections, including all http 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, keep the number of
connections low and close unnecessary sockets.
Verbose Mode
The connection to a DXP switcher can be used to monitor for changes that
occur on the switcher, such as front panel operations and SIS commands from
other connections or a serial port. To receive change notices from the switcher,
you must enable verbose mode 1 or 3 (see the Set verbose mode command
in the Command and Response Table for IP-specific SIS Commands, page 69). In verbose
mode 1 or 3, changes are reported in messages that resemble SIS command responses.
Host-to-Switcher Instructions
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 occurs, the switcher responds
by sending a message to the host. The switcher-initiated messages are listed below
(underlined). In these messages, Vn.nn is the firmware version number and 60-nnnn-01 is
the DXP part number.
With an RS-232 or RS-422 connection:
(c) Copyright 2011, Extron Electronics DXP DVI-HDMI, Vn.nn, 60-nnnn-01
]
The switcher initiates the copyright message if it is powered on while connected to the
computer.
With an Ethernet connection:
(c) Copyright 2011, Extron Electronics DXP DVI-HDMI, Vn.nn, 60-nnnn-01
]
Ddd, DD Mmm YYYY HH:MM:SS
The switcher initiates the copyright message when a connection is established via Internet
protocol (IP).