17-17
IM 05P02D41-01EN
Installation and W
iring
17
17.4.11
RS-485 Communication Interface Wiring
Wire as follows for Modbus communication, PC link communication, or ladder
communication.
Always connect a terminating resistor to the station at the end of the communication line.
► Details of communication parameter settings and communication functions: UTAdvanced Series
Communication Interface (RS-485, Ethernet) User's Manual
4-wire Wiring
ML2-
□
SG
SDB (+)
SDA (
–
)
RDB (+)
RDA (
–
)
RDB (+)
RDA (
–
)
SDB (+)
SDA (
–
)
SG
RDB (+)
RDA (
–
)
SDB (+)
SDA (
–
)
SG
RS-232C
Straight cable
UP
2
1
4
3
5
6
UP
Grounding
Grounding
Grounding
Communication
cable
Communication
cable
PC
(External)
Terminating resistor
220
Ω 1/4 W
(External)
Terminating
resistor
220
Ω 1/4 W
(External)
Terminating
resistor
220
Ω 1/4 W
2-wire Wiring of 4-wire Terminal
SG
ML2-
□
UP
B (+)
A (
–
)
SDB (+)
SDA (
–
)
RDB (+)
RDA (
–
)
SG
SDB (+)
SDA (
–
)
RDB (+)
RDA (
–
)
SG
RS-232C
Straight cable
PC
4
3
5
6
Grounding
Grounding
Grounding
UP
(External)
Terminating resistor
220
Ω 1/4 W
(External)
Terminating
resistor
220
Ω 1/4 W
Communication
cable
Communication
cable
Terminal
symbol above.
(For Standard model) UP35A Suffix
code: Type 3 =
“1”
(For Detailed model) UP35A
Optional suffix code: /CH3
(For Standard model) UP32A Suffix
code: Type 2 =
“1”
RDB (+)
410
304
RDA (–)
411
305
SDB (+)
407
301
SDA (–)
408
302
SG
409
303
Note
ML2-x indicates a converter of YOKOGAWA. Other than this, RS232C/RS485 converters
can also be used. If another converter is to be used, check the electrical specifications of the
converter before using it.
17.4 Wiring
Summary of Contents for UP35A
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