Appendix C Troubleshooting and CommonQuestions
© National Instruments Corporation C-7 PCI Serial for Windows Me/9x
How do I change the resources assigned to the serial interface?
The PCI serial boards are configured as devices belonging to the
multi-function adapters class. The multi-function parent device is listed
under the Multi-function adapters icon, and each child device is listed as
a port under the Ports (COM & LPT) icon.
To change the resources of serial ports, complete the following steps:
1. In the Device Manager tab, under Multi-function adapters,
double-click on a serial interface.
2. Click on the Resources tab to change the resources. Your changes are
automatically reflected to the child devices under Ports (COM &
LPT).
How do I remove information about serial boards from the Device
Manager?
Refer to the Uninstall the Hardware section in Appendix B, Uninstalling
the Hardware and Software.
What is the maximum baud rate supported and how can I set it?
The maximum baud rate supported is 460.8 Kbaud for RS-485 and
115.2 Kbaud for RS-232. To set the baud rate, use the SetCommState
Win32 function and pass the actual value of the baud rate in the BaudRate
field of the DCB structure.
Table C-1. Standard DOS-Based Addresses
COM Port Base Address
COM1 3f8
COM2 2f8
COM3 3e8
COM4 2e8