Omron K3HB, Technical Communications User'S Manual

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1-4
Communications Method
Section 1-1
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Converter Example: RS-232C/RS-485 Converter
RS-232C
• Use terminals B1 through B3 to communicate with the host.
• Wiring is configured 1:1.
• The maximum cable length is 15 m. Use OMRON’s Z3RN RS-232C Opti-
cal Interface to extend the wiring path.
• Use shielded, twisted-pair wires of at least AWG28 to AWG16 for all
cables. (Same wire used for RS-485 cable.)
+
RS-232C
B1 or B3
(B)
(A)
B2 or B4
B1 or B3
B2 or B4
(B)
(A)
-
B1 or B3
B2 or B4
(B)
(A)
K32-23209
Adapter
K3SC-10
RS-232C/RS485
Converter
100- to 125-
Ω
Terminator
(1/2 W)
K3HB
(No. 1)
100- to 125-
Ω
Terminator
(1/2 W)
K3-HB
(No. 31)
D-sub, 9-pin
(Straight)
K3HB
(No. 0)
A B C D E
1 1
2 2
3 3
4 4
5 5
6 6
B
SD
RD RS-232C
SG
RS-232C
9-pin
--- FG
3 SD
2 RD
7 RS
8 CS
6 DR
4 ER
5 SG
No.
1 SD
2 RD
3 SG
RS-232C
RS-232C
K3HB
Host computer
Shield
25-pin
1
2
3
4
5
6
20
7