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UserGuide for Cisco Digital Media Manager5.4.x
OL-15762-05
Chapter15 Touchscreens, Projectors, and Displays
Procedures
Step2
Make connections for audio.
a.
Plug the 3mm jack on the RCA audio cable into the AUDIO inte rface on the back panel of
your DMP.
b.
Connect the free end of this cable to the corresponding interface on your presenta tion system.
Step3
If the presentation system is not already turned on, turn it On now.
Step4
Stop. You have completed this procedure.
Related Topics
•
Video and Audio Signal Interfaces, page 15-30
Use RS-232 Signals to Control Presentation Systems
No international agency exists to tell all of the world’s video equipment manufacturers which commands
and methods (such as RS-232) a presentation system must support. Likewise, no global authority exists
to state exactly which hexadecimal string—if any —must invoke a particular command.
So when manufacturers implement RS-232 commands, they do so as they see fit. Thus, RS-232
command syntax differs among manufacturers and sometimes differs even among equipment models that
share a manufacturer in common.
Tip Check the manufacturer’s product documentation for your LCD display to learn about its RS-232 support andsyntax.
So, how is RS-232 useful to me?
Your digital signs run in the real world because your organization expects to tell someone something.
But when you, the administrator, are half a world away from a sign, or even just a few buildings away,
how can you be absolutely sure that your sign is doing anything—let alone everything— correctly?
•
Is its power turned Off when it should be turned On?
•
Is its audio muted during an exclusive musical performance?
•
Does it ignore a valid video input signal while listening on some other, but disconnected, interface?
Meanwhile, how can you recognize and fix any such misconfiguration from miles away? Situations like
these are perfect for RS-232, whose technology passes properly cons tructed “command-and-control”
instructions through a DMP and into its attached presentation system.
A case in point: Cisco Digital Signs software can tell you automatically and in real-time which of your
centrally managed Cisco LCD displays are turned On or Off. You can learn at a glance when one (or
more) of these remote units is in the wrong power state, and then issue a simple command to correct the
mistake. But even so, your ability to turn remote equipment On or Off so easily through the Internet is
just one benefit of feeding RS-232 commands through a DMP to its attached LCD display.
This section includes these top ics.
•
Prepare Cisco Displays to Support RS-232 Syntax, page 15-11
•
Bootstrap DMTech Displays to Enable Their RS-232 Support, page 15-14
•
Bootstrap NEC Displays to Enable Their RS-232 Support, page 15-16
•
Delete Equipment Settings That Use RS-232 Syntax, page 15-20