04-05-2013, 04:29 PM
Wireless system of Data Acquisition
Wireless system.pptx (Size: 951.65 KB / Downloads: 25)
What is Data Acquisition?
Data acquisition is the process of sampling signals that measure real world physical conditions and converting the resulting samples into digital numeric values that can be manipulated by a computer.
The sub-blocks of DAS are
Sensor / Actuator
Signal conditioning unit
Data acquisition system
Computer
Software
How does Wired DAS and Wireless DAS differ?
The block diagram of a wireless data acquisition system looks exactly the same as one with wires.
This is because only the wired network is removed and replaced by the wireless one.
END POINT
It is the most numerous elements of the s/m
Besides data acq. EP can be adjusted for CONTROLLING of ELECTROMECHANICAL device.
Always Works in RECEIVING MODE & NOT in SENDING
SENDS only on request from BS.
PROGRAMMING OF THE SYSTEM ELEMENTS
For simplification the s/m divided into
3 configuration the BS,RP & EP.
It should be possible for the configuration to work with GSM/GPRS modem and PSTN.
Software tests of the connected peripherals
Detects the presents of Components.
CONFIGURING EP.
Each point is assigned a unique address.
Initially the fixed address 255 is specified in configuration
Special jumper and PC software allows to select and setup the new address.
And saved in nonvolatile memory.
THE INQUIRING OF THE SYSTEM ELEMENTS
The time division of the channel is used for working with EP.
The BS provides defined time slot when EP should send response.
The time of response can be changed.
[path length & pass via several other endpoints and RP].
Sends ACK or NACK.