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CrossPoint 450 Plus and MAV Plus Switchers • Programmer’s Guide
Establishing a connection
Establish a network connection to a CrossPoint 450 Plus or MAV Plus switcher as
follows:
1
. Open a TCP socket to port 23 using the switcher’s IP address.
N
If the local system administrators have not changed the value, the
factory-specified default, 192.168.254.254, is the correct value for this field.
The switcher responds with a copyright message that includes the copyright
year, product name, firmware version, part number, and the current date and
time.
N
If the switcher is not password-protected, the device is ready to accept SIS
commands immediately after it sends the copyright message.
N
If the switcher is password-protected, a password prompt appears below the
copyright message.
2. If the switcher is password protected, enter the appropriate administrator or
user password.
If the password is accepted, the switcher responds with Login User or
Login Administrator.
If the password is not accepted, the Password prompt reappears.
Connection Timeouts
The LAN port times out after a designated period of time of no communications.
By default, this timeout value is set to 5 minutes but the value can be changed.
See the "Set current port timeout" SIS commands on page 4-23.
N
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 CrossPoint 450 Plus or MAV 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, keep the number of connections
low and close unnecessary open sockets.
Using Verbose Mode
Telnet connections to a CrossPoint 450 Plus or MAV 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 3. See the "Set Verbose Mode" SIS command on page 4-23. In verbose
mode 3, the telnet socket reports changes in messages that resemble SIS command
responses.