AMX TPI-PRO-4, Operation/Reference Manual

Page: 170 / 218

NetLinx Programming
164 TPI-PRO/DVI (Total Presentation Interface)
URL Resources
A URL can be broken into several parts. For example: the URL http://www.amx.com/company-info-home.asp .
This URL indicates that the protocol in use is http (Hyper Text Transport Protocol) and that the information
resides on a host machine named www.amx.com . The image on that host machine is given an assignment ( by
the program ) name of company-info-home.asp (Active Server Page) .
The exact meaning of this name on the host machine is both protocol dependent and host dependent. The
information normally resides in a file, but it could be generated dynamically. This component of the URL is
called the file component, even though the information is not necessarily in a file.
A URL can optionally specify a port, which is the port number to which the TCP connection is made on the
remote host machine. If the port is not specified, the default port for the protocol is used instead. For example,
the default port for http is 80.
An alternative port could be specified as: http://www.amx.com:8080/company-info-home.asp .
Special Escape Sequences
The system has only a limited knowledge of URL formats in that it transparently passes the URL information
onto the server for translation. A user can then pass any parameters to the server side programs such as CGI
scripts or active server pages. However, the system will parse the URL looking for special escape codes.
When it finds an escape code it replaces that code with a particular piece of panel, button, or state information.
For example, " http://www.amx.com/img.asp?device=$DV " becomes
"
http://www.amx.com/img.asp?device=10001
".
Other used escape sequences include:
Any legal HTTP syntax can be used.
Escape Sequences
Sequence Panel Information
$DV Device Number
$SY System Number
$IP IP Address
$HN Host Name
$MC Mac Address
$ID Neuron ID
$PX X Resolution of current panel mode/file
$PY Y Resolution of current panel mode/file
$BX X Resolution of current button
$BY Y Resolution of current button
$BN Name of button
$ST Current state
$AC Address Code
$AP Address Port
$CC Channel Code
$CP Channel Port
$LC Level Code
$LP Level Port