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Chapter 4. WIRING
4-18
● 3-wire system RS-485 mutual connection
Provide terminating resistor of 150Ω±5%, 1/2W min. at both ends of the communications path.
Grounding of the shielded FG terminal should be carried out at only one end and not both ends.
When there are only three RS-485 terminals, terminals marked * are wired internally.
57
58
59
60
61
SDA
SDB
RDA
RDB
SG
FG
57
58
59
60
61
SDA
SDB
RDA
RDB
RDA
RDB
SDA
SDB
SG
FG
SG
FG
57
58
59
60
61
SDA
SDB
RDA
RDB
SG
FG
Terminating resistor
Terminating resistor
Slave station DCP301
Slave station DCP301
Slave station DCP301
Shielded cable
Master station
Shielded cable
Shielded cable
*
*
Be sure to connect SG terminals each
others.
Failure to do so might cause unstable
communications.
Handling Precautions