Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario Pagina 62

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Preface
MicroLogix 1000 Programmable Controllers User Manual
3–4
Personal
Computer
Modem
Modem
Modem
Cable
1761-CBL-PM02
Micro Controller
Optical Isolator
(recommended)
DF1
full-duplex protocol (to 1 controller)
DF1 half-duplex master protocol (to multiple controllers)
DF1 full-duplex protocol or
DF1 half-duplex slave protocol
9-pin 8-pin Mini Din
Optical Isolator
Modem
Programming
Device
Modem
Controller
Null Modem
1761-CBL-PM02 Cable
Modem Cable
We
recommend using an AIC+, catalog number 1761-NET
-AIC, as your optical isolator
. See page 3–1
1 for
specific AIC+ cabling information.
Constructing
Y
our Own Null Modem Cable
If you construct your own null modem cable, the maximum cable length is 15.24 m
(50 ft) with a 25-pin or 9-pin connector. Refer to the following typical pinout:
25-Pin
9-Pin
2
5
1
4
6
8
7
3
RTS
TXD
RXD
GND
CD
DTR
DSR
CTS
RXD
3
7
8
20
6
5
4
GND
CD
DTR
DSR
CTS
RTS
TXD
2
Modem
Optical Isolator
2
5
1
4
6
8
7
3
9-Pin
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