467
E5
@
K Digital Controller Read Protocol Appendix F
RS-485 Connection
Note 1. The communications configuration is a one-to-one configuration or a one-to-N configuration. In the
one-to-N configuration, up to 32 units including the Serial Communications Unit/Board can be con-
nected.
2. The maximum cable length is 500 m. Use a shielded twisted-pair cable for the cable (AWG28i or
greater).
3. Connect a terminator only at both ends of the transmission path. For instance, in the example shown
below, connect a terminator to the Serial Communications Unit/Board and unit No. 30 and do not con-
nect any terminator to units No. 0 to No. 29. Use a resistance of 120
Ω (1/2 W) for the terminators
(the total resistance of both ends must be 54
Ω or more).
RS-485 port
E5#K
E5#K
E5#K
Up to 31 units can be connected.
→
→
→
Serial Communications Board
(CS Series only)
Serial Communications Unit
(CS/CJ Series)
RS-485
RS-485
RS-485
PLC PS
Terminator (120 Ω, 1/2 W)
A<B: [1] Mark
A>B: [0] Space
Serial Communications Board/Unit
Pin No.
Shielded cable
E5CK (No. 30)
Terminal No. Terminal No.
E5CK (No. 0)
RS-485: D-sub
9 pin female
RS-485: Terminal block RS-485: Terminal block
1
2
FG
13
14
A
B
13
14
A
B
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