Omron E5AC, Communications Manual

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1 Communications Methods
E5@C Digital Temperature Controllers Communications Manual (H175)
1-1 Overview of
Co
mmu
nica
-
tio
n
s Met
hod
s
1
1-
1-5
Wiring
E5DC
E5GC
Match the communications specifications of the E5
@
C and the host. When using a 1:N connection,
set the same communications specifications in all of the Units. Each Communications Unit must
have a unique unit number.
This section explains how to set the E5
@
C's communications specifications. For details on the host,
refer to the user's manual provided with the host.
RS-485
4
3
RS-485
6.8 V
TX
RX
4
3
FG
−
+
SG
A (
−
)
B (+)
A (
−
)
B (+)
120
Ω
(1/2 W)
Pin
Abbreviation
Specify both ends of the transmission path including the
host as the end node (that is, connect terminating resistance
to both ends). Use a terminating resistance of at least 54
Ω
.
Host
E5DC
E5DC
End node
RS-485
Shield
Shield
Terminating
resistance
Use 120
Ω
(1/2 W)
terminating resistance.
A < B: "1" Mark
A > B: "0" Space
Communications
transceiver
Pin
Abbreviation
Abbreviation
Abbreviation
FG
+
−
SG
Host
RS-485
Abbreviation
A(-)
B(+)
Pin
8
7
E5GC
RS-485
Shield
120
Ω
(1/2 W)
terminating
resistance
6.8V
TX
RX
Use 120
Ω
(1/2 W)
terminating resistance.
Shield
E5GC
End node
RS-485
Abbreviation
A(-)
B(+)
Pin
8
7
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 terminating resistance to both ends).
Use a terminating resistance of at least 54
Ω
.
Communications
transceiver