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Appendix D Troubleshooting and Common Questions
© National Instruments Corporation D-15 Serial Hardware and Software for Windows
How can I determine which version of the NI-Serial software I have
installed?
The Read Me file gives the version of the software. To open the file, select
Start»Programs»National Instruments Serial»Read Me.
What do I do if the diagnostic test fails with an error?
Refer to the Troubleshooting Diagnostic Messages section earlier in this
appendix.
How can I determine which port is associated with COMx?
To determine which physical port is associated with COMx, complete the
following steps:
1. In the Device Manager tab, under Ports (COM & LPT), double-click
on a serial port.
2. Click on the Port Settings tab to display the serial number of the serial
hardware and the physical port number starting at 1. For all serial
hardware, PORT1 refers to the top port, PORT2 refers to the next port
down, and so on.
How can I change the COM numbers of my National Instruments
serial ports?
To name serial ports COM1, COM2, COM3, or COM4, change the base
address of the port. To do so, refer to the Troubleshooting Diagnostic
Messages section earlier in this appendix.
When you change the base address, Windows Me/9x automatically
converts it to the corresponding COM name listed in Table D-1. You do not
need to change the IRQ setting for Windows Me/9x to change the name.
Table D-1. Standard DOS-Based Addresses
COM Port Base Address
COM1 3f8
COM2 2f8
COM3 3e8
COM4 2e8