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Chapter 4 PCMCIA Serial Hardware Installation, Verification, and Configuration
Serial Hardware and Software for Windows 4-8 ni.com
Use FIFO Buffers
FIFO buffers are present on the 16550-compatible UARTs—one for the
transmitter and one for the receiver. The Receive Buffer control sets the
number of characters received in the FIFO before the PC is interrupted to
read the data. The Transmit Buffer control sets the maximum number of
bytes written to the FIFO in a block when the PC is interrupted to write the
data. When you configure FIFO settings, consider the following points:
• You can select larger FIFO buffer sizes to reduce the number of
interrupts your PC receives and therefore minimize system overhead.
• If transfer rates are high, you can lower the Receive Buffer value to
prevent overrun errors due to interrupt latency.
• If your data transfer sizes are small and your Receive Buffer value is
above your data sizes, your system is less efficient. Therefore, set the
Receive Buffer value below your data sizes.
Restore Defaults
To reset the fields to their default values at any time, click on the Restore
Defaults button.
Windows Me/9x
Install the Software
Install the NI-Serial software for Windows Me/9x before you install the
hardware:
1. Select Start»Settings»Control Panel.
2. Double-click on the Add/Remove Programs iconin theControl Panel
to launch the Add/Remove Programs applet. The Add/Remove
Programs dialog box appears.
3. Click on the Install button.
4. When prompted, insert the NI-Serial Software for Windows
2000/NT/Me/9x CD and click on the Next button to proceed.
The software installation wizard begins.
The setup wizard guides you through the necessary steps to install the
NI-Serial software. You can go back and change values where
appropriate by clicking on the Back button. You can exit the setup
where appropriate by clicking on the Cancel button.