Warning – Yokogawa PR300 Power and Energy Meter User Manual
Page 23
2-14
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<2. Setup>
IM 77C01E01-10E
2.3.3
Wiring for RS-485 Communication for Ethernet-Serial
Gateway Function
To use the Ethernet-serial gateway function, connect other RS-485 serial communication
device to the RS-485 communication terminals .
WARNING
To avoid an electric shock, be sure to turn off the power supply source to the equipment
involved before you start wiring.
The figure below shows the example of wiring connection for the PR300 with Ethernet
communication function. If other devices are used for connection, the names of communi-
cation terminals and others may be different from those mentioned in the figure.
Read the user’s manual of each device carefully before wiring.
19
17
17
18
18
19
20
20
18
19
20
Ethernet
PR300
(with RS-485
communication function)
PR300
(with Ethernet
communication function)
PR300
(with RS-485
communication function)
PC
Terminator (built-in)
120
Ω
1/4W
Terminator (built-in)
120
Ω
1/4W
JIS Class D (3) grounding
(grounding resistance
of 100
Ω
or less)
Communication
cable
Communication
cable
A
؊
B
؉
SG
A
؊
B
؉
SG
Wthen terminating on
wiring, short-circuit
terminals 17 and 18 .
Wthen terminating on
wiring, short-circuit
terminals 17 and 18 .