Campbell-scientific Sentek EnviroSCAN EasyAG SDI-12 Manual v 3.4 Manual de usuario Pagina 26

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EnviroSMART & EasyAG SDI-12 Probe Manual
Copyright © 1991 2003 Sentek Pty Ltd All rights reserved Page 21
Circuit Information
Figure 6: SDI-12 interface circuit diagram
Figure 7: TTL interface circuit diagram
74HC1
G125GW
74HC14
1
2
3
MF-R090
VSUP
SMCJ22A
GND
GND GND GND
GND
N81-A350X
MF-R010 510R
3.3nF
200K SML4737
510R
Phoenix
EMC 1,5/3-G-3,5 (EnviroSMART)
MPT0.5/3-2.54 (EasyAG)
VCC
4
3
5
1
2
8 9
SDI-12
+V IN
0V
VCC
GND
TTL-TXD1
TTL-RXD1
BAR43
MD1
1
2
3
4
5
6
6 PIN
MICROSPOX
+V CC
TXD1
RXD1
PROGRAMMING JUMPER
PROGRAMMING JUMPER
0V
1M
VCC
74HC14 74HC14
74HC14 74HC14
13 12 11 10
8 9 6 5
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