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
Summary of Contents for Hydro-Probe XT
Page 4: ...4 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Page 6: ...6 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Page 8: ...8 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Page 10: ...10 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Page 14: ...Chapter 1 Introduction 14 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Page 42: ...Chapter 4 Configuration 42 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Page 58: ...Chapter 7 Sensor diagnostics 58 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Page 60: ...Chapter 8 Technical specification 60 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Page 66: ...Appendix B Document Cross Reference 66 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...