Omron EJ1 User Manual page 48

Wiring Terminals
B1
A1
B2
A2
B3
A3
B4
A4
B5
A5
B6
A6
B7
A7
B8
A8
B9
A9
HFU
1
2
3
4
5
6
7
8
9
EDUA
Models with
Screw
Terminals
(EDUA)
Note
RDB (+)
RDA ( )
RS-422
1
2
3
4
B (+)
5
6
A ( )
7
8
9 RS-485
10
Port A communications
EDUC
Connector
Terminal
Block Model
(EDUC)
• If there are problems with communications noise performance when using
the port A connector, connect 110 to 125
across terminals 1 and 2 of port A on the EDU.
• Specify both ends of the transmission path, including the host computer,
as end nodes (i.e., connect terminators to both end). The minimum termi-
nating resistance is 54 .
■ Connection Example
R
EJ1
EJ1
B (+)
B7 A7
A ( )
B8 A8
A9
RS-485 RS-232C
Port C communications
Models with
Screw
Terminals
(EDUA)
B (+)
1
A ( )
2
Port B communications
Host Shield
+
FG
EDUA
6
B (+)
RS-485
7
A ( )
EDUA
Terminator
110 to 125
B (+) 6
R
7
A ( )
Section 2-2
SDB (+)
SD
SDA ( )
RD
SG DO NOTUSE
RS-422
Connector
Terminal
Block Model
(EDUC)
6 7
7 8
RS-485
of terminating resistance
(1/2 W)
23