Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers - Manual (Page 62)

Preface MicroLogix 1000 Programmable Controllers User Manual
3–4
Personal Computer
Modem
Modem
Modem
Cable
1761-CBL-PM02
Micro Controller
Optical Isolator
➀
(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
➀
Modem
Programming
Device
Modem
Controller Null Modem
1761-CBL-PM02 Cable
Modem Cable
➀ We recommend using an AIC+, catalog number 1761-NET-AIC, as your optical isolator. See page 3–11 for
specific AIC+ cabling information.
Constructing Your 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