integrated systems programming embedded systems and systems integration
TRANSCRIPT
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Integrated Systems Programming
Embedded Systems
And
Systems Integration
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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”
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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
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Interfaces
• Infra Red• Serial Communications• Relay contact closure• Switch contact closure• Ethernet• Wireless (R.F.)• Power Line Carrier• Proprietary interfaces
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Infrared
• Used to control A.V. and some appliances(air conditioners, drape controls)
• Unidirectional
• Line of sight
• Proprietary issues
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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
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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
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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
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Wireless I.R. distribution
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Wireless I.R. distribution
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In Cabinet Solution
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Wired I.R. Distribution
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Wired I.R. Distribution
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Wired I.R. Distribution
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Wired I.R. Distribution
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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.
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Control Processor
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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
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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!
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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
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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
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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
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Power Line Carrier
• X-10 is most obvious example
• Other PLC communications is possible including TCPIP.
• Typically slow
• Prone to interference and signal loss
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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.