Nivetec Echo Smart Series, Руководство по эксплуатации и установке

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8.1.2. Wired RS-485 Field Network (Figure 8.2)
Up to sixteen Smart Sensors can be operated with one EchoSmart Controller via
two-wire RS-485 from a Controller to each Power Supply Unit. No user
programming or other integration is required.
To create the wired network, a shielded two-wire twisted pair (recommended
Belden 9463) should be used between each ESP and to the ESC. Connections for
the RS-485 communication line are made at the 3-pin terminal strip (J8) on each
ESP and at the 8-pin sensor connector (J9) on the ESC as shown in Figure 8.2
below.
Figure 8.2: Single Wired Field Network
ESC
ESP*
*
A 120

resistor needs to be inserted between the + and
–
terminals of the last power supply in the series.
ESC = Echo Smart Controller
ESP = Echo Smart Power Supply
RS-485 (J8)
RS485
to DCS
or SCADA
1 2 16
–
ESP
1
8
S
enso
r
Co
n
n
ec
tion
s
(
J9
)
RS-485 (J8)
RS-485 (J7)
1
3
3
2
4 S
–
+
+
–
S
3
1 1
3
120

*
S
–
+