Preparing For Communications; Cable Connections - Omron E5EK PROGRAMMABLE TYPE User Manual

6.2 Preparing for Communications

J Cable connections
F RS-232C
25 pins
IBM-PC/XT
DE-25
Female
DTE
(SD) TXD 2
(RD) RXD 3
(RS) RTS 4
(CS) CTS 5
(DR) DSR 6
(SG) COMMON 7
(ER) DTR 20
FG 1
F RS-422
For details on wiring when the communications function is used, see
Chapter 2 Preparations.
• Only one controller can be connected to the host computer.
(1:1 connection)
• The cable length should not exceed 15 meters.
• Use shielded twisted-pair cables (AWG28 or more) for the cables.
E5EK-T
RS-232C
No.
20 SD
19 RD
18 SG
• 1:1 or 1:N connections are allowed. In a 1:N connection, up to 32 con-
trollers including the host computer can be connected.
• The total cable length should not exceed 500 meters.
• Use shielded twisted-pair cables (AWG28 or more) for the cables.
• Attach terminators to the controllers at both ends of the series of con-
trollers connected in an open configuration. For example, in the fol-
lowing configuration, connect the terminator to unit No.30, and do
not connect terminators to unit Nos.0 to 29.
• Use terminators having a resistance of 240 Ω (1/2 W). The total resis-
tance of both ends should be at least 100 Ω.
Host computer
RS-422
Shielded cable
RDA
RDB
SDA
SDB
SG
FG

6.2 Preparing for Communications

9 pins
IBM-PC/AT
DE-25
Female
DTE
(RD) RXD 2
(SD) TXD 3
(ER) DTR 4
(SG) COMMON 5
(DR) DSR 6
(RS) RTS 7
(CS) CTS 8
FG 1
E5EK-T (No.0)
RS-422
TerminatorX2
No.
(240 Ω 1/2 W)
22 SDA
SDB
21
RDA
19
20 RDB
SG
18
E5EK-T
RS-232C
No.
20 SD
19 RD
18 SG
E5EK-T (No.30)
RS-422
No.
22 SDA
SDB
21
RDA
19
20 RDB
SG
18
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