Electrical Installation and Communication
Hydro-Probe XT User Guide HD0538 Rev: 1.6.0 29
3 RS485 multi-drop connection
The RS485 serial interface allows up to 16 sensors to be connected together via a multi-drop
network. Each sensor should be connected using a waterproof junction box.
K
Brown
E
Black
J
Green
G
Black
F
White
D
Blue
E
Black
C
Yellow
B
Black
A
Red
To PC
or plant
control
device
A
Junction
Box
0975A twisted
pair Sensor
Cable
Do not connect
screen at control
cabinet
H
Screen
B
F
G
From
other
sensors
Figure 21: RS485 multi-drop connection
When designing the cabling for the sensor network, standard installation practices for RS485
networks is that the cable should run in a bus topology rather than as a star topology. This
means that the RS485 cable should run from the control room to the first sensor before linking on
to any other sensors in turn. This is shown in Figure 22.
Figure 22: Correct RS485 cable networks
Figure 23: Incorrect RS485 cabling
Содержание Hydro-Probe XT
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Страница 14: ...Chapter 1 Introduction 14 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Страница 42: ...Chapter 4 Configuration 42 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Страница 52: ...Chapter 6 Optimising Sensor and Process Performance 52 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Страница 58: ...Chapter 7 Sensor diagnostics 58 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Страница 60: ...Chapter 8 Technical specification 60 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Страница 66: ...Appendix B Document Cross Reference 66 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
