Omron E5AN-H User Manual page 59

Wiring Terminals
Communications
38
RS-485
• When communications are to be used with the E53-CN@03N2 for the
E5CN-H, or E53-EN03 for the E5AN/EN-H, connect communications
cable across terminals 11 and 12 or 21 and 22.
11
B(+)
RS-485
12 A(−)
E53-CN@03N2 (for E5CN-H)
Specify both ends of the transmission path including the host computer as
end nodes (that is, connect terminators to both ends).
The minimum terminal resistance is 54 Ω.
Communications Unit Connection Diagram
E5CN-H
Host computer
RS-485
−
+
FG
A < B: [1] Mark
A > B: [0] Space
E5AN/EN-H
Host computer
RS-485
−
+
FG
A < B: [1] Mark
A > B: [0] Space
• The RS-485 connection can be either one-to-one or one-to-N. A maxi-
mum of 32 Units (including the host computer) can be connected in one-
to-N systems. The maximum total cable length is 500 m. Use AWG24
(cross-sectional area: 0.205 mm
2
2.081 mm ) shielded twisted-pair cable.
11
B(+)
12
A(−)
Do not use.
13
21
B(+)
A(−)
22
E53-EN03 (for E5AN/EN-H)
Shield
E5CN-H (No. 1)
RS-485
No.
Abbreviation
12 A (−)
11 B (+)
Terminator (120 Ω, 1/2 W)
Shield
E5AN/EN-H (No. 1)
RS-485
No.
Abbreviation
22 A (−)
21
B (+)
12 A (−)
11
B (+)
2
) to AWG14 (cross-sectional area:
Cross-sectional area of
conductor
AWG24: 0.205 mm
AWG14: 2.081 mm
Section 2-2
RS-485
E5CN-H (No. 31)
RS-485
No.
Abbreviation
12
A (−)
11
B (+)
E5AN/EN-H (No. 31)
RS-485
No.
Abbreviation
22
A (−)
21
B (+)
12 A (−)
11
B (+)
Terminator (120 Ω, 1/2 W)
2
2