Publication 1764-UM001A-US-P
Communication Connections
4-5
Constructing Your Own Modem Cable
If you construct your own 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 for
constructing a
straight-through
cable:
Constructing Your Own Null Modem Cable
If you construct your own null modem cable, the maximum cable length is 15.24m
(50 ft) with a 25-pin or 9-pin connector. Refer to the following typical pinout:
AIC+ Optical Isolator
or 1764-LRP Channel 1
Modem
9-Pin
25-Pin
9-Pin
3
TXD
TXD
2
3
2
RXD
RXD
3
2
5
GND
GND
7
5
1
CD
CD
8
1
4
DTR
DTR
20
4
6
DSR
DSR
6
6
8
CTS
CTS
5
8
7
RTS
RTS
4
7
pins 4 and 6
are internally
connected for
1764-LRP only
Optical Isolator
Modem
9-Pin
25-Pin
9-Pin
3
TXD
TXD
2
3
2
RXD
RXD
3
2
5
GND
GND
7
5
1
CD
CD
8
1
4
DTR
DTR
20
4
6
DSR
DSR
6
6
8
CTS
CTS
5
8
7
RTS
RTS
4
7
Содержание micrologix 1500
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Страница 6: ...Publication 1762 RM001A US P Preface P 4...
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