23
Wiring Terminals Section 2-2
• 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
Ω.
■ Connection Example
• The RS-485 connection can be either 1:1 or 1:N. RS-232C connections
can only be 1:1. A maximum of 64 Units (including the host) can be con-
nected in 1:N systems. The maximum total cable length is 500 m. Use
AWG28 (cross-sectional area: 0.081 mm
2
) to AWG16 (cross-sectional
area: 1.309 mm
2
) shielded twisted-pair cable.
R
6
7
EJ1 EDU
B (+)
6
7
EJ1 EDU
FG
−
+
R
RS-485
Host Shield
Terminator
110 to 125 Ω (1/2 W)
B (+)
A (−)
A (−)
Cross-sectional area of conducto
AWG28: 0.081 mm
2
AWG16: 1.309 mm
2
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