7th Sense Delta, User Manual, Page: 99 / 156

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Managing Delta Servers © 2018 7thSense Design
Stack web interface
Sequence
A sequence on the server to be run at the trigger points.
PJLink Control
PJLink control is a specific standard communications protocol used by many projector brands and
models. Its protocol is different from Telnet, and since it involves a short handshake, can be difficult to
implement just using UDP to TCP. The strings that are sent look like this power instruction example:
"%1POWR 1" (note the space between POWR and 1).
There are options available through the Stack interface to tackle this. You can place a PJLink button on a
control page (see StackDesigner) or use the built-in Task Scheduler to schedule (for example) projector
power on/off at certain times.
Alternatively, since you can send HTTP from Delta you could hook into the PJLink backend in the Stack
interface directly.
These calls look like the following:
http://127.0.0.1/api/pjlink/instruction?
ip= 10.100.101.105&port=10000 &command=POWR&variable=0&password=JBMIAProjectorLink
(Replace 10.100.101.105 with the required projector IP and port with the projector port.)
· PJLink combines a command with a variable, so for power it is command=POWR and variable=0/1.
·
Password is optional, if you aren’t using authentication you can leave it off.
·
For more general information about PJLink protocol, please see the JMBIA website: About PJLink
Stack API
The Stack web interface includes a fully-documented HTTP API for discovering and interacting with
Delta Media Servers over a local network. It contains a PHP SDK library to integrate control of Delta
Media Server directly into PHP applications with hosting capabilities on the server, and provides an add-
on framework for developing fully customisable web extensions including user interfaces and
interactive web resources.
Access the API add-on through the Stack Landing page, or any web service page under Help > API
Specification > Delta RPC . The interface is fully interactive.