4-3IN1404XT Video Scaler and Switcher • Programmer’s Guide

The scaler’s default leading delimiter code is a left bracket ( [ ). The default ending
delimiter code is a right bracket ( ] ).
Example: [CH3] — where “[“ is the leading code, “CH3” is the command (select
input 3), and “]” is the ending code.
The scaler can be set to recognize one of six different delimiters: parentheses ( ),
brackets [ ], braces { }, slashes \ / less-than and greater-than symbols < >, and the !
and # signs. If desired, several Extron products that use this command set protocol
can be connected together on one RS-232 serial control line, with each device set for
a different delimiter pair. Each unit only responds to codes sent with the
appropriate deliminators and ignores all other codes.
See Delimiters screen in chapter 3, Operation to change the delimiters to which the
scaler responds.
Scaler Responses
When the scaler receives an RS-232 command and determines that it is valid, it
performs the command and sends a response to the host device. If the scaler is
unable to perform the command because the command is invalid or contains
invalid parameters, the scaler returns an error response to the host. The error
response codes are:
Invalid parameter — The scaler received a parameter outside the valid range
Not available — The scaler received a parameter that is within the valid range, but
is not allowed given the current settings
E10 — Invalid command
E11 — Invalid preset number (too large)
E12 — Invalid output number (too large)
E13 — Invalid value (out of range)
Using the Command/Response Table
The command/response table begins on the next page. Upper or lower case letters
are acceptable in the command field. The table below shows the hexadecimal
equivalent of each ASCII command. All entries in the command/response table are
shown using the [] delimiters, but any other valid delimiters could be used instead.
ASCII to HEX Conversion Table
•