Da
te
Co
de
2
00
11
00
9
SE
L-
70
1-
1 M
on
ito
r
In
st
all
at
io
n
M
on
ito
r C
on
ne
cti
on
s
2.
23
Figure 2.17
Rear-Panel EIA-485 Serial Port Connections.
To minimize reflections in an EIA-485 network, use termination resistors at each end of the line. Also, to ensure that the network will “float” to A
logic Level 1 or “high” when all drivers on the EIA-485 network are tristated, bias resistors may be required.
120
1nF
SEL-701 Relay
Modbus
RTU
Master
+
–
C10 C12
C11
TX
C13
RX
Other
Devices
120
1nF
120
Characteristic
Twisted, Shielded Pair
Connect Shield to
Ground at One Point Only
Содержание SEL-701-1
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