Annotator • SIS Programmer’s Guide
5-3
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.
N
Extron 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 Annotator 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 processor-initiated messages are listed
below.
With an RS-232/422 connection (upon power up):
(c) Copyright 2009, Extron Electronics Annotator, Vx.xx, 60-968-14
]
With an Internet connection:
(c) Copyright 2009, Extron Electronics Annotator, Vx.xx, 60-968-14
]
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.
N
Password prompt is re-displayed if an incorrect password is entered.
]
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.
