Worth Data P11/12 - Manual (Page 39)

C-1
Appendix C
Jumper Settings
Your WDP Reader is shipped with its jumpers set to match the configuration
(scanner type, interface method, etc.) you ordered. Why might you need/want to
check or change jumper settings?
If you change your scanner type, or install a second scanning device, you may
need to change some jumper settings.
If you're going to install the WDP Reader in Bus Interface mode, you may
need to change the Interrupt Number and Port Address jumpers.
If your WDP Reader or scanner doesn't power up correctly, you should make
sure the WDP has the correct jumper settings for your configuration.
Open the WDP Reader's case using the instructions in Appendix A.
Interrupt Number jumper JP4, the Interrupt Number jumper:
The WDP Reader in Bus Interface mode can use any one of interrupts 2 though 6.
The default is interrupt 3. Go through the list below to determine which interrupts
are not already in use in your system, and choose one of those. If all interrupts are
already in use, you'll either have to free one up (by disabling COM2 or LPT2 on
your computer, for example) or use the WDP Reader in wedge mode rather than
bus mode.
If your system has any real-time clocks, network boards, bus mice, tape controllers
or other add-on devices installed, they may be using some of these interrupts. If
you have any of these in your system, compare their switch settings to your manuals
to see what interrupts they're using.
Interrupt 2: Don't use this interrupt if you have an AT, 386 or 486 system,
an EGA, or an IBM network adapter.
Interrupt 3: This interrupt is usually used by COM2, the second serial port.
If you don't have a COM2, or an internal modem or other
device set to COM2, you should be able to use it.
Interrupt 4: This interrupt is usually used by COM1, the first serial port. If
you don't have a COM1, or an internal modem or other device
set to COM1, you should be able to use it.
Interrupt 5: This interrupt is used by the hard disk on a PC or XT system, and
LPT2, the second parallel port, on an AT system. You can use it if
you have a floppy-only PC or XT system, or an AT system with only
one parallel port.
Interrupt 6: This interrupt is used by the floppy diskette drive controller.
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