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4-19
Chapter 4. WIRING
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3-lead RS-485 mutual connection
Handling Precautions
• Be sure to connect SG terminals each
other.
Failure to do so might cause unstable
communications.
Provide terminating resistors of 150 Ω ±5 %, 1/2 W 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.
In this connection, the Azbil Corporation
CMC10L001A000
can be used as a host sta-
tion converter.
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 (controller
or DIGITRONIK controller)
Slave station (controller
or DIGITRONIK controller)
Slave station (controller
or DIGITRONIK controller)
Shielded cable
Master station
Shielded cable
Shielded cable
*
*
*
*
*
*
*
*