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22
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6) Connections of Low order communication RS-422A
Example of connection 1
KR3000
Low order
communication terminal
KE3000 etc.
SE3000, MELSEC etc.
SG
SDB
SDA
RDB
RDA
SG
Termination
resistor
100
Ω
1/4W
SG
RDB
RDA
SDB
SDA
SDB
SDA
RDB
RDA
Example of connection 2 (SYSMAC)
KR3000
Low order
communication terminal
SYSMAC
SG
SDA(-)
SDB(+)
RDA(-)
RDB(+)
SG
SG
RDB
RDA
SDB
SDA
SYSMAC
Termination
resistor
100
Ω
1/4W
SDA(-)
SDB(+)
RDA(-)
RDB(+)
Please note that the polarity of A and B of the communication terminal is different from
SYSMAC and this product.
To ensure the transmission of data via RS-422A communications, mount a termination resistor at the
ends of receiving lines.
Mounting termination resistor
Remarks