User's Manual

Error responses
When the IPL T CR48 receives a valid command, it executes the command and sends a
response to the host device. If the unit is unable to execute the command because the
command contains invalid parameters, it returns an error response to the host.
E10 — Invalid command
E12 — Invalid port number
E13 — Invalid parameter
E14 — Not valid for this configuration
E17 — System timed out
E22 — Busy
E24 — Privilege violation
E25 — Device not present
E26 — Maximum number of connections exceeded
E27 — Invalid event number
E28 — Bad filename/file not found
E31 — Attempt to break port pass-through when not set (A user or software attempted to
disable the port redirect feature when it wasn’t already set or active.)
References to errors (at command descriptions on the following
pages)
24
= Commands that give E24 (privilege violation) if not administrator level
27
= Commands that may give E27 (invalid event number)
28
= Commands that may give E28 (file not found)
URL Encoding
URL encoding is the method of using ASCII hexadecimal characters to display specific
characters in a URL. URL encoding is used for several reasons. On some operating systems,
certain characters are unsafe or not available, and others are reserved by the HTML or URL
specification. URL encoding is used to ensure compatibility and functionality with most
Internet browsers. As a general rule, use the URL hexadecimal encoding method shown in
the following tables when these characters appear in your URLs.
The following types of characters do not require encoding in a URL.
Alphanumerics
Special characters
Reserved characters
0-9 a-z A-Z
$ _ _ . + ! * ( ) ,
; / ? : @ = &
When used for their reserved purposes, these
characters do not require encoding within a URL.
IPL T CR48 • Communication and Control 26