Symbols Used in the Command and Response Table
The IPI 201/204 Series intercom can be controlled via a Telnet (port 23) or RS-232 connection
using ASCII commands. Alternatively, it can be controlled via a web browser (port 80) connection
using URL-encoded commands.
The ASCII and URL commands listed in the
Command and Response Table
, starting on
page 41, perform the same functions, but they are encoded differently to accommodate the
requirements of each port (Telnet or browser).
The ASCII to hexadecimal (HEX) conversion table shown below is for use with the Command and
Response table.
ASCII to HEX Conversion Table
Space
.
The Command and Response table lists valid ASCII (for Telnet or RS-232) command codes,
the corresponding URL encoded (for web browsers) command codes, the responses to the
host from the IPI, and a description of the command function or the results of executing the
command.
•
Upper and lower case characters may be used interchangeably in the command field unless
otherwise specified.
•
Commands may be sent back-to-back without spaces (for example,
11S0X4Q
).
•
Numbers can be entered with leading zeroes, as 1, 2, or 3 digits.
•
There are a few differences in how to enter the commands depending on whether you are
using Telnet or a web browser.
When using these commands through a web browser, the URL reference is used to shorten the
examples. “URL” refers to the full URL of the intercom and web page reference including all path
information (for example,
http://192.168.100.10/myform.htm
).
To send any of the commands using a web browser you must prefix them with the full URL
followed by
?cmd=
, followed by the command.
For control via a web browser, all non-alphanumeric characters must be represented as the
hexadecimal equivalent,
%
xx
, where
xx
represents the two-character hex byte. For example, a
comma (,) would be represented as
%2C
.
Characters such as %, +, and the space character, must be encoded as hex bytes, or they will
be misinterpreted by the IPI.
IPI 100 and IPI 200 Series • SIS Programming and Control
38
