National Instruments PCMCIA-232 Getting Started

Also see for PCMCIA Series: Getting started

Contents

National Instruments PCMCIA-232 Getting Started Manual pdf 29 page image

Chapter 3 ConfigurationPCMCIA Serial for Windows 953-4 ©National Instruments CorporationThe following sections describe the advanced port setting options.Transceiver ModeThe transceiver mode selection is available by clicking on the Advancedbutton on the Port Settings tab. It shows the transceiver mode in use, andapplies only to PCMCIA-485 cards. Refer to Chapter 4, Using Your SerialHardware, for more information about transceiver modes.FIFO BuffersThe FIFO buffer control is available by clicking on the Advanced buttonon the Port Settings tab. FIFO buffers are present on the 16550-compatibleUARTs—one for the transmitter and one for the receiver. Consider thefollowing points when selecting FIFO settings:• You can select larger FIFO settings to minimize system overhead.• If transfer rates are high, you can lower receive FIFO settings toprevent overrun errors.• If data sizes are small, selecting FIFO settings just above data sizes canreduce efficiency, so select lower settings.Note If you want your serial hardware ports to use the names COM1, COM2, COM3,or COM4, refer to the Common Questions section of Appendix D, Troubleshootingand Common Questions.