110
Programless Communications Section 5-1
• RS-232C
•RS-485
• Attach terminating resistance (110 to 125
Ω) to pins 6 and 7 on the EDU
port B if there are problems with communications noise resistance.
Note Refer to Related Manuals on page xiv for the operating methods for SYSMAC
CS/CJ-series CPU Units and Serial Communications Boards/Units.
B1
B2
B3
B4
B5
B6
B7
B8
B9
A1
A2
A3
A4
A5
A6
A7
A8
A9
EJ1@-HFU
SD
RD
RS
CS
SG
FG
Signal
2
3
4
5
9
Shell
Pin
No.
SYSMAC
CJ/CS Series
RS-232C
Turn ON pin 8 of SW2
to set RS-232C.
SD
RD
SG
RS-232C
Shield
RS-485
B(+)
A(−)
EJ1@-HFU
SYSMAC
CJ/CS Series
RS-485
Shield
Signal
B1
B2
B3
B4
B5
B6
B7
B8
B9
A1
A2
A3
A4
A5
A6
A7
A8
A9
1
2
6
8
Shell
Pin
No.
RDA−
RDB+
SDA−
SDB+
FG
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