Transcript Systems Integration

Integrated Systems
Programming
Embedded Systems
And
Systems Integration
What is System Integration
• Creating interconnection, control and
communications between systems that
would normally stand alone
• In other words “Interfacing”
• Computers or controllers at the heart of an
integrated system may be deemed an
“embedded system”
The Systems Integrator
As a systems integrator, your job is to:
1. understand the interface requirements or
possibilities and determine best
approach
2. plan the overall integration and the
functionality of the system
3. Plan the user experience – “User
Friendly”
4. Program the System
Interfaces
•
•
•
•
•
•
•
•
Infra Red
Serial Communications
Relay contact closure
Switch contact closure
Ethernet
Wireless (R.F.)
Power Line Carrier
Proprietary interfaces
Infrared
• Used to control A.V. and some appliances
(air conditioners, drape controls)
• Unidirectional
• Line of sight
• Proprietary issues
Characteristics of I.R.
• Infra Red is light that is invisible to the
naked eye because it is outside the normal
wavelength that we can see
• It is generated by an I.R. L.E.D.
• It is detected by I.R. receiver
• Serial digital signals are modulated onto
the L.E.D. and demodulated after the
detector
I.R. Signals
•
•
•
•
The signal is serial data.
I.R. works on line of sight.
I.R. cannot go through objects
I.R. can reflect as normal light
Distribution
• It is sometimes useful to have I.R.
transferred between rooms
• It is sometimes useful to have I.R.
generated in or behind a cabinet and
control a device not in “line of sight”
• It is sometimes useful to have I.R.
control equipment in a cabinet or wiring
closet not visible to the handheld
remote control or other I.R. emitter
Wireless I.R. distribution
Wireless I.R. distribution
In Cabinet Solution
Wired I.R. Distribution
Wired I.R. Distribution
Wired I.R. Distribution
Wired I.R. Distribution
Control System I.R.
• Crestron and other control systems can
use I.R. for control.
• They typically use the same type of wired
I.R. emitters seen above.
Control Processor
rs232
•
•
•
•
•
•
Classic serial interface
Positive control
Hard wired
Provides for 2 way (feedback)
Not plug-and-play due to protocol choices
DTE vs DCE issues
Relay Contact Closure
•
•
•
•
Simple on/off
X-10 through universal module
Crestron Digital Outputs
PLC (Programmable Logic Controllers) systems
handle this well – commercial applications
• Unidirectional
• Positive control
• Good for high current applications
• You must consider current/voltage limits!
Switch Closure
• Simple on/off for sensing status
• Proximity sensing, door open/close, trigger
of events
• Crestron Digital Inputs
• Could be used for Power Probes
Ethernet
• Becoming the standard
• Good for high speed communications between
devices (100MBPS and rising)
• Good for networks of all kinds
• Internet/Intranet
• Telecommunications
• Some appliances are beginning to incorporate
• Some A.V. equipment
Wireless
•
•
•
•
•
•
•
Based on Radio Frequency
Digital signals modulated onto R.F.
Wireless Ethernet
Easy to install
Slower than wired systems
Prone to interference and blocking
Security issues
Power Line Carrier
• X-10 is most obvious example
• Other PLC communications is possible
including TCPIP.
• Typically slow
• Prone to interference and signal loss
Proprietary Interfaces
• Examples:
– Cresnet
– Lutron MUX
– A.V. device interconnect specific to 1
company. Typically a company may have a
receiver that can control the DVD or CD
player but only of their own brand.