Extron electronic DXP DVI PRO manual Host-to-Switcher Instructions, Switcher-initiated Messages

Connection Timeouts

The Ethernet link times out after a designated period of no communications. By default, this timeout value is set to 5 minutes, but the value can be changed (see the Configure current port timeout command in the Command and Response Table for IP-specific SIS Commands, page 71).

NOTE: 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 and reopening the connection when another command must be sent.

Number of Connections

A DXP switcher can have up to 200 simultaneous TCP connections, including all http 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, keep the number of connections low and close unnecessary sockets.

Verbose Mode

The connection to a DXP switcher can be used to monitor for changes that occur on the switcher, such as front panel operations and SIS commands from other connections or a serial port. To receive change notices from the switcher, you must enable verbose mode 1 or 3 (see the Set verbose mode command in the Command and Response Table for IP-specific SIS Commands, page 71). In verbose mode 1 or 3, changes are reported in messages that resemble SIS command responses.

Host-to-Switcher 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 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.

Switcher-initiated Messages

When a local event such as a front panel operation occurs, the switcher responds by sending a message to the host. The switcher-initiated messages are listed below (underlined). In these messages, Vn.nn is the firmware version number and 60-nnnn-01 is the DXP part number.

With an RS-232 or RS-422 connection:

(c) Copyright 2011, Extron Electronics DXP DVI-HDMI, Vn.nn, 60-nnnn-01]

The switcher initiates the copyright message if it is powered on while connected to the computer.

With an Ethernet connection:

(c)Copyright 2011, Extron Electronics DXP DVI-HDMI, Vn.nn, 60-nnnn-01]

Ddd, DD Mmm YYYY HH:MM:SS

The switcher initiates the copyright message when a connection is established via Internet protocol (IP).

DXP DVI, DXP DVI Pro, and DXP HDMI Series • SIS Configuration and Control 51