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.
NExtron recommends leaving the default timeout at five 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
The USP 507 can have up to 200 simultaneous TCP connections, including all HTTP sockets and Telnet connections. When the connection limit is reached, the processor 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, the number of connections should stay low and unnecessary open sockets should be closed.
Using verbose mode
Telnet connections to the processor can be used to monitor for changes that occur on the processor, 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 processor, the Telnet session must be in verbose mode 1 or 3. In verbose mode 1 or 3, the Telnet socket reports changes in messages that resemble SIS command responses.
Host-to-Processor 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 processor 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.
Processor-Initiated Messages
When a local event such as a front panel operation occurs, the processor responds by sending a message to the host. The
With an
(c)Copyright 2009, Extron Electronics USP 507, V1.00,
With an Ethernet connection:
(c)Copyright 2009, Extron Electronics USP 507, V1.00,
Ddd, DD MMM YYYY HH:MM:SS (day, date, time. e.g. Tue, 14 Apr 2009 14:43:17)
The processor initiates the copyright message when powered on or when connection via Internet protocol (IP) is established. Vx.xx is the firmware version number.
]Password:
The processor initiates the password message immediately after the copyright message when the controlling system is connected using TCP/IP or Telnet and the processor is password protected. The processor requires an administrator or user level password before performing the commands entered.
NPassword prompt is
]Login Administrator] and ]Login User]
The processor initiates the login message when a correct administrator or user password has been entered. If the user and administrator passwords are the same, the processor defaults to administrator privileges.
USP 507 • SIS Programmer’s Guide |
