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SUNIX NCCI Co., Ltd.
TEL : +886-2-8913-1987
Email : info@sunix-ncci.com.tw
4. Troubleshooting
This chapter shows some problems that user came with usually. Also you can check it if the PCI / PCI-E serial board
can not work properly in your system after following hardware and software installation steps.
Troubleshooting
1. System fails to find the PCI / PCI-E serial board or COM port.
A: It may cause by following issue:
a. The board is not properly plugged into the PCI / PCI-E slot.
b. Please clean the golden finger.
c. The PCI / PCI-E slot is defective. Please try other slots until you find one that works.
d. The mainboard does not have an available IRQ for the PCI / PCI-E serial board. Enter the PC.s BIOS and make sure
an IRQ setting is available in the PCI/PnP settings.
e. The board itself might be defective. You can try another mainboard testing this board working or not.
2. There is a blue screen when I entry operation system.
A: The possible reason is an IRQ or I/O address conflict with other PCI / PCI-E bus adapters, such as LAN or serial
boards, or with the system BIOS. Refer to the corresponding problem in the previous FAQ for solutions.
3. There are some exclamation marks in device manager and serial ports can not work properly.
A: It caused by the wrong driver installing or hardware settings. Please turn off your computer firtly and re-install
hardware and software.
4. The PCI / PCI-E serial board cannot be detected by the attached driver while installing the driver.
A: It may cause by following issue:
a. The board is not installed. Please install the board in an empty PCI / PCI-E slot.
b. The board is not properly plugged into the system’s PCI / PCI-E slot. If that is the case, re-plug the board in a
32-bit PCI / PCI-E slot. It may also be the case that the PCI PCI-E slot is defective. In this case, try other PCI /
PCI-E slots until you find one that works.
5. FIFO overrun or Buffer overrun occurs during transmission
A: This is due to the buffer size is too large such that the CPU can not process those data in time. The problem usually
happens when running at very high baudrate speed. Try lowering the buffer size one step at a time until overrun no
longer occurs or enable the flow control during transmission.