15.RS-485 COMMUNICATION INTERFACE(OPTION)
97
- One-to-One Connection
- One-to-more Connection
Use a twisted pair cable for connection. (The noise margin will increase.) However, a
twin cable is sufficient for short-distance connection. Couple a terminal resistor of 100 -
200
Ω
to the receiving end.
(The terminus resistance by the side of F371 can be switched by setup.120 ohms is
conncted when terminus resistance is set as ON.)
A
B
SD
A
B
RD
A
B
RD
A
B
SD
A
B
A
B
F371
PLC
Host Computer etc.
end reg
end reg
（
Master
）
（
Slave
）
A
B
RD
A
B
SD
A
B
A
B
SD
RD
A
B
A
B
SD
RD
A
B
A
B
SD
RD
A
B
A
B
SD
RD
end
Twisted pair cable
F371
F371
F371
F371
end
