IBM Aptiva, Hardware Handbook

Page: 40 / 136

30 Communications settings
Conflicts may arise if you add adapter cards with serial
ports or if you change the address settings on your
modem. You can resolve most of these conflicts by
using the Configuration/Setup Utility to change serial
port addresses. See “Working with the Configura-
tion/Setup Utility” on page 63 for more information.
Changing modem addresses
The modem address in your communications software
must match the address setting on your modem. For
example, if the modem address in the software is
COM1 3F8, the DIP switches or jumpers on your modem
must also be set for COM1 3F8. Help messages in your
modem software will help you change your software
address. The information below will help you set the DIP
switches or jumpers on your modem correctly.
To change the hardware address settings on a built-in
14,400 bps data modem , locate the six DIP switches
on the modem bracket on the back of the computer. Use
the chart printed on the modem bracket to set the DIP
switches for the correct address.
To change the hardware address settings on a built-in
2400 bps data modem , you must reset jumpers on
the modem. To access the modem jumpers, remove the
cover from the computer. To remove the cover, see
page 81. The illustration shows how you should set the
jumpers for each address.
JP6
JP1
5
4
3
2 5
4
3
2
JP6
JP1
JP6
JP1
JP6
JP1
5
4
3
2 5
4
3
2
IRQ
COM1 3F8
IRQ
COM2 2F8
IRQ
COM3 3E8
IRQ
COM4 2E8