Interface; Wiring - Omron E5AN Communications Manual

SECTION 1 Communications Methods

■ Interface

■ Wiring

● RS-485
● E5CN
Host
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.
1-4
Communications with the host are carried out through a standard RS-
485 interface or RS-232C interface (E5AN, E5EN, and E5GN only).
Use a K3SC Interface Converter for RS-485 and RS-232C interface
conversion.
• The RS-485 connection can be either one-to-one or one-to-N. Up to 32
units including the host can be connected in a one-to-N system.
• The total cable length is 500 m max.
• Use a shielded, AWG24 to AWG14 (cross-sectional area of 0.205 to
2
2.081 mm ) twisted-pair cable for the E5CN, E5EN, or E5AN. Use a
shielded, AWG24 to AWG18 (cross-sectional area of 0.205 to
2
0.823 mm ) twisted-pair cable for the E5GN. The stripping length is 5 to
6 mm for the E5CN, E5AN, or E5EN, and 6 to 8 mm for the E5GN.
Abbreviation
FG
−
+
SG
Shield
E5CN
RS-485
Pin
Abbreviation
12 A (−)
11 B (+)
6.8 V
E5CN
Terminator
120 Ω
End node
(1/2 W)
RS-485
Pin
12
11
Use a 120 Ω (1/2 W)
Shield
terminator.
Communications
transceiver
TX
RX
Abbreviation
A (−)
B (+)