ky thuat truyen dan.pdf
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H thng thng tin cng nghip
2/11/2006
4.6 K thut truyn dn
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4.6 K thut truyn dn
1. Phng thc truyn dn tn hiu2. RS-2323. RS-4854. MBP
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1. Phng thc truyn dn tn hiu Truyn khng i xng khng i xng hay n cc
(unbalanced mode, single-ended mode): s dng in p chnh lch gia mt dy dn v t V d: RS-232
D RVo Vi
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u nhc im ca phng thc n cc
Tit kim dy dn Kh nng khng nhiu km (nhiu ngoi, nhiu xuyn
m - crosstalk, chnh lch in p t) Phi s dng mc tn hiu cao (hu qu?) Tc truyn km (ti sao?) Khong cch truyn ngn (ti sao?)
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Phng thc chnh lch i xng (balanced differential mode): s dng in p chnh lch gia hai dy dn A v B
(hoc - v +) V d: RS-422, RS-485, MBP (IEC-611582)
D RT
A
BT
VCM
VCM: Common Mode Voltage
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u nhc im ca phng thc chnh lch i xng
Khng tit kim dy dn lm Kh nng khng nhiu tt C th s dng mc tn hiu thp Tc truyn cao Khong cch truyn ln
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2. RS-232 Tn chnh thc: EIA/TIA-232, do Electronic Industry
Association v Telecommunication Industry Association cng xy dng
Tn thng dng: RS-232 (RS: Recommended Standard) Cc phin bn: RS-232c, RS-232f, chun s dng cho cng
COM ca my tnh c nhn thng l RS-232c Tng ng vi chun chu u l CCITT V.24)
DTE DTEMODEM(DCE)
MODEM(DCE)
VIN THNG
NG RS-232
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Mc tn hiu
Phng thc truyn: n cc
+15V
+3V
-3V
0
1
D R
+25V
-25V
-15V
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Giao dinRS-232
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Mt s c im c bn Phng thc truyn dn khng i xng Ch truyn hai chiu ng thi (full duplex) Ghp ni im-im Tc truyn thp (chun: 19.2 kbps) Khong cch truyn ngn (thng thng 15-30m) ng dng ch yu:
Ghp ni PC-PC, PC-Modem Ghp ni PC-PLC Ghp ni PC hoc PLC vi cc thit b o, thit b thu
thp d liu, ....
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Giao din c hc
DSR Data Set ReadyRTS Request To SendCTS Clear To SendRI Ring Indicator
DCDRxDTxDDTRGND
DSRRTSCTS
RI
DCD Data Carrier DetectRxD Receive DataTxD Transmit DataDTR Data Terminal ReadyGND Ground
DCDRxDTxDDTRGNDDSRRTSCTSRI
(a) S gic cm DB-9 (b) S chiu tn hiu
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V d ghp ni
TxD
RxDRTS
CTSDTR
DSR
GND
TxD
RxDRTS
CTSDTR
DSR
GND
TxD
RxDRTS
CTSDTR
DSR
GND
TxD
RxDRTS
CTSDTR
DSR
GND
Transmit Data
Receive Data
Request To Send
Clear To Send
Data Terminal Ready
Data Set Ready
Ground
b) Ch bt tay a) Cu hnh ghp ni ti thiu
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3. RS-485
Tn chnh thc EIA/TIA-485, phin bn mi nht lEIA/TIA-485b
Truyn chnh lch i xng => cc u im nu L chun c s dng thng dng nht trong cc h
thng truyn thng cng nghip (Profibus FMS/DP, Interbus, AS-Interface v cc giao thc ring khc...)
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Qui nh mc tn hiu
+5V
+1.5V/+0.2V
-1.5V/-0.2V
0
1
+6V
-6V
-5V
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Cu hnh ghp ni hai dy
D
RR
D
DR
DR
RT RT
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Cu hnh ghp ni 4 dy
D RRT
R D
DR
RT
RT
RT
DR
Master
Slave
Slave
Slave
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Mt s c im c bn Phng thc truyn dn chnh lch i xng Ch truyn ch yu l hai chiu gin on Ghp ni nhiu im, s trm ti a/on mng l 32
(ti sao?) Tc truyn cao (c th ti > 10Mbps) Khong cch truyn ln (c th ti 1200m) C th dng ti 3 b lp (4 on mng), trong thc t
c th hn Tr u cui: 100 hoc 120Ohm
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Quan h gia tc truyn v khong cch truyn (s dng i dy xon AWG 24)
3
30
300
3000
100 1k 10k 100k 1M 10M
Tc truyn (bit/s)
C
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m
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1200
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Ti sao s trm l 32? Theo qui nh chun, mt
b kch thch tn hiu phi m bo dng tng cng 60mA va cung cp cho: Hai tr u cui mc song
song tng ng ti 60(120 ti mi u) vi in p ti thiu 1,5V => 25mA
32 ti n v mc song song vi dng 1mA qua mi n v ti (trng hp xu nht) => 32mA.
-7V -3V
12V5V
-0.8mA
1mA
Khi nim n v ti
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4. MBP (IEC 61158-2)
MBP (Manchester Coded, Bus-Powered): ng dng ch yu trng cng nghip ch bin Kh nng dng trong mi trng yu cu an ton chy
n M Manchester, truyn ng b Kh nng ng ti ngun Truyn chnh lch i xng, mc tn hiu chnh lch
0,75-1V Tc truyn 31,25kbps (c nh) S trm ti a 32/on, 126/ton mng, ti a 4 b lp Khong cch truyn ti a 1900m/on => 9500m/ton
mng Tr u cui 100Ohm p dng trong Foundation Fieldbus, Profibus-PA
H thng thng tin cng nghip 4.6 K thut truyn dn1. Phng thc truyn dn tn hiuu nhc im ca phng thc n ccu nhc im ca phng thc chnh lch i xng2. RS-232Mc tn hiuMt s c im c bnGiao din c hcV d ghp ni3. RS-485Qui nh mc tn hiuCu hnh ghp ni hai dyCu hnh ghp ni 4 dy Mt s c im c bnQuan h gia tc truyn v khong cch truyn (s dng i dy xon AWG 24) Ti sao s trm l 32?4. MBP (IEC 61158-2)
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