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9 Troubleshooting

Listed here are some common problems and frequent causes of those problems. If the

information here does not provide a solution, contact Quatech technical support.

Any unauthorized repairs or modifications will void the

QSC(LP)-200/300's warranty.

Computer will not boot up.

1. Is the QSC(LP)-200/300 properly inserted? Remove the card and try again. Perhaps try a

different expansion slot.

2. Ensure that an ISA-bus card is not using the same IRQ that the PCI BIOS tries to assign

to the QSC(LP)-200/300. Most computers have BIOS setup options to reserve IRQs for

either ISA or PCI use. Try reserving the IRQ for the ISA card. The BIOS will

automatically choose a different IRQ for the QSC(LP)-200/300. An address conflict is

unlikely because most PCI-based computers will assign I/O addresses in such a way that

they cannot conflict with ISA-bus devices.

3. The QSC(LP)-200/300 may be defective. Contact technical support for instructions.

Cannot communicate with other equipment.

1. Are the cable connections correct? Are the cables securely attached?

2. Is the software configured with the correct base address and IRQ information for the

QSC(LP)-200/300? (This is mainly a DOS issue.)

3. Is the device driver installed?

4. If you are trying to communicate with another DTE, a null-modem cable will be required.

5. If possible, use a loopback connector to test the port. This connector needs to connect the

following sets of signals on a D-9 connector:

TxD+ and RxD+ (pins 2 and 4)

TxD- and RxD- (pins 7 and 8)

AuxOut+ and AuxIn+ (pins 1 and 5)

AuxOut- and AuxIn- (pins 6 and 9)

Quatech QSC(LP)-200/300 User's Manual 31

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Quatech QSC-100 Bedienungsanleitung Seite 33