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9. Troubleshooting
Listed here are some common problems and frequent causes of those problems.
Suggestions for corrective action are given. If the information here does not
provide a solution, contact Quatech Customer Service for technical support.
Any unauthorized repairs or modifications will void the
DS-200/300's warranty.
Computer will not boot up.
1. Is the DS-200/300 properly inserted? Remove the card and try again.
Perhaps try a different expansion slot.
2. Is the base address correctly set? Check for address conflicts with other
devices in the system. Remember that each port on the DS-200/300
requires 8 bytes of I/O space. Set a different address if necessary.
3. The DS-200/300 may be defective. Contact Quatech Customer Service for
instructions.
Cannot communicate with other equipment.
1. Are the cable connections correct? Are the cables securely attached?
2. Are the base address and interrupt level (IRQ) correctly set? Check for
address and IRQ conflicts with other devices in the system. Change the
settings if necessary.
3. If you are trying to communicate with a DTE, a null-modem cable may be
required.
4. If possible, use a loopback connector to test the port. This loopback needs
to connect the following 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)
Sample Code and a detailed description of the DS-200/300's UARTs is
available on Quatech's BBS (330)434-2481.
9-1 Quatech Inc.