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5/22/2018 Upravljacki racunarski sistemi
1/10
Racunarski bazirani upravljacki sistemi
4.1
.
.
4.1
.
.
,s(t))
.
.
,
.
5/22/2018 Upravljacki racunarski sistemi
2/10
Akvizacija I Kondicioniranje podataka
(Data Acquisition System)
,
.
.
,
,
.
.
.
A/D
(AnalogtoDigital
Converter)
, .
A/D
.
,
,
.
A/D
.
,
.
(Tranducers).
Kondicioniranje
.
A/D ,
.
A/D .
. ,
,
.
,
.
,
.
5/22/2018 Upravljacki racunarski sistemi
3/10
Analogno/digitalna konverzija
,
,
.
/ .
.
4.6a 4.6b.
: / ,
4.6a;
, 4.6b.
/
4.6b.,
/
,
,
A/D.
5/22/2018 Upravljacki racunarski sistemi
4/10
Analogno/digitalna konverzija
4.8 A/D
A/D 4.8
,
:
;
Sample and Hold S/H; A/D Start; A/D
.
A/D
A/D
.
.
.
5/22/2018 Upravljacki racunarski sistemi
5/10
4.2.1 RS232
,
. DTE (Data Terminal Equipment) DCE (Data Communication
Equipment) .
, DTE , DCE
, .
,
. EIA (Electronic
Industries Association)
RS-232C, . RS-232
. DB25 , 4.10.
4.2.
5/22/2018 Upravljacki racunarski sistemi
6/10
USB
USB
4.14.
USB , PCI ,
(host controller)
USB .
, . USB
:
USB ,
,
.
(root hub)
,
5V .
( ) ,
(hub) USB .
, USB
,
2-8
USB .
( ). :
,
,
,
,
,
,
/
500mA (100mA ),
500,
3ms,
() ,
.
5/22/2018 Upravljacki racunarski sistemi
7/10
Tipovi prenosa kod USB-a
:
(interrupt transfer),
USB .
, ,
.
,
( )
.
(bulk transfer)
,
.
, ,
.
, .
(isochronous transfer)
. /
. ,
( )
.
(control transfer)
, USB
, . USB
, /
.
.
:
, , ,
,
, .
5/22/2018 Upravljacki racunarski sistemi
8/10
USB po hiearhiskom nivou
( 4.17).
(Client SW)
USB ,
/ USB.
, USB
,
. USB ,
.
. ,
,
. (message
pipe)
.
. USB
IRP (I/O Request Packet),
. USB
,
.
.
, . (token)
,
(handschake)
. : ,
CRC .
5/22/2018 Upravljacki racunarski sistemi
9/10
USB
USB
.
,
.
B, USB .
.
USB , (
). ( 4.19).
USB , 5m
.
,
, , ,
.
.
,
.
,
NRZI .
5/22/2018 Upravljacki racunarski sistemi
10/10
4.4
.
.
,
/
.
4.12.
(. ), / ,
.
.
, I2C Bus RS-232/RS-485
.
,
(self diagnostics), (self
identification) (self adaptation).
(DSP).
.
, .
.
VLSI (Very Large Scale Integrated)
,
,
.
.
Recommended