Figure
A-3. Pinout of the EIA 232 Port
EIA 232 Modem Cable Connections
Use a straight-through modem cable to connect the EIA 232 port of the 8270 to a
modem.
Signal Name
Terminal /PC End
25-Pin Male
Switch End
9-Pin Female
TXD
RXD
RTS
CTS
DSR
GND
DCD
DTR
RI
2
3
4
5
6
7
8
20
22
3
2
7
8
6
5
1
4
9
Figure
A-4. EIA 232 Modem Cable for Terminal with 25-Pin Connector
EIA 232 Null-Modem Connections
Use a null-modem (crossover) cable as shown in Figure A-5 to connect the EIA
232 port to a terminal (DTE) with a 25-pin connector. Alternatively, you can use a
modem cable and a null-modem adapter. DTR (pin 20) and RTS (pin 4) must be
on, or high, on your terminal or in your terminal emulation program.
Signal Name
Terminal /PC End
25-Pin Male
Switch End
9-Pin Female
TXD
RXD
RTS
CTS
DSR
GND
DCD
DTR
RI
2
3
4
5
6
7
8
20
22
3
2
7
8
6
5
1
4
9
Figure
A-5. EIA 232 Null-Modem Cable for Terminal with 25-Pin Connector
Use a null-modem (crossover) cable as shown in Figure A-6 on page A-4 to
connect the EIA 232 port to a terminal (DTE) with a 9-pin connector. Alternatively,
you can use a modem cable and a null-modem adapter. DTR (pin 4) and RTS (pin
7) must be on, or high, on your terminal or in your terminal emulation program.
Appendix A. Cable and Pin Information
A-3
Summary of Contents for 8270
Page 1: ...8270 Models 600 and 800 Installation and Service Guide...
Page 10: ...x 8270 Nways LAN Switch Models 600 and 800...
Page 13: ...Safety Information xiii...
Page 14: ...xiv 8270 Nways LAN Switch Models 600 and 800...
Page 16: ...xvi 8270 Nways LAN Switch Models 600 and 800...
Page 78: ...6 8 8270 Nways LAN Switch Models 600 and 800...
Page 92: ...B 8 8270 Nways LAN Switch Models 600 and 800...
Page 97: ......