4-5
CrossPoint / MAV Matrix Switchers • Programmer’s Guide
Establishing a connection
Establish a network connection to a CrossPoint 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 including the date, the name
of the product, firmware version, part number, and the current date/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 Ethernet link 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 Configure port timeout commands on page 4-25.
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 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, the number of connections should
stay low and unnecessary open sockets should be closed.
Verbose Mode
Telnet connections to a CrossPoint 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 1 or 3.
See the Set verbose mode command on page 4-24. In verbose mode 1 or 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 or 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. 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.
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