National Instruments 3.22E+04 用户手册
Appendix C
Troubleshooting and Common Questions
© National Instruments Corporation
C-7
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.
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.
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).
automatically reflected to the child devices under Ports (COM &
LPT).
How do I remove information about serial boards from the Device
Manager?
Manager?
Refer to the
section in Appendix B,
.
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.
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