Omron E5CN-HT Communications Manual page 19

● E5CN-HT
Host side
RS-485
A < B: "1" Mark
A > B: "0" Space
Specify both ends of the transmission path including the host
as the end node (that is, connect terminators to both ends).
Use a terminating resistance of at least 54 Ω.
● E5AN/EN-HT
A < B: "1" Mark
A > B: "0" Space
Specify both ends of the transmission path including the host
as the end node (that is, connect terminators to both ends).
Use a terminating resistance of at least 54 Ω.
Abbreviation
FG
−
+
SG
Shield
Host side
RS-485
Abbreviation
FG
−
+
SG
Shield
Match the communications specifications of the E5CN/AN/EN-HT and the
host. When using a 1: N connection, set the same communications specifica-
tions in all of the Units. (Of course, each Unit must have a unique unit
number.)
1.1 Overview of Communications Methods
E5CN-HT
RS-485
Pin
Abbreviation
12
A (−)
11 B (+)
6.8 V
E5CN-HT
Terminator
120 Ω
End node
(1/2 W)
RS-485
Pin
12
11
Use a 120 Ω (1/2 W)
Shield
terminator.
E5AN/EN-HT
RS-485
Pin
Abbreviation
12
11 B (+)
22
A (−)
B (+)
21
Terminator
120 Ω
(1/2 W)
Shield
Use a 120 Ω (1/2 W)
terminator.
Communications
transceiver
TX
RX
Abbreviation
A (−)
B (+)
Communications
transceiver
TX
A (−)
RX
6.8 V
E5AN/EN-HT
End node
RS-485
Pin
Abbreviation
12
A (−)
11 B (+)
22
A (−)
B (+)
21
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