Extron Electronics Annotator User Guide - Manual (Page 44)

Establishing a Connection
Establish a network connection to the processor as follows:
1. Open a TCP socket to port 23 using the processor’s IP address.
NOTE: 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 processor responds with a copyright message including the date, the name of the
product, firmware version, part number, and the current date/time.
NOTE: • If the processor is not password-protected, the device is ready to accept SIS
commands immediately after it sends the copyright message.
• If the processor is password-protected, a password prompt appears below
the copyright message.
2. If the processor is password protected, enter the appropriate administrator or user
password.
•
If the password is accepted, the processor responds with Login User or
Login Administrator.
•
If the password is not accepted, the Password prompt reappears
Connection Time-outs
The Ethernet link times out after a designated period of time of no communications. By
default, this time-out value is set to five minutes but the value can be changed.
NOTE: Extron recommends leaving the default time-out 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.
Annotator • SIS Communication and Control 38