National Instruments PCI-232/2, Getting Started, Page: 7 / 64

Contents
PCI Serial for Windows 95 viii
©
National Instruments Corporation
Advanced Port Settings ..................................................................................... 3-3
Transceiver Mode ............................................................................... 3-4
FIFO Buffers....................................................................................... 3-4
Chapter 4
Using Your Serial Hardware
Advanced Transceiver Control for the PCI-485.............................................................. 4-1
Four-Wire Mode ............................................................................................... 4-1
Two-Wire Mode: DTR with Echo .................................................................... 4-1
Two-Wire Mode: DTR Controlled ................................................................... 4-2
Two-Wire Mode: TXRDY Auto Control.......................................................... 4-2
Setting the Transceiver Control Mode .............................................................. 4-2
Setting the Transceiver Mode with DeviceIoControl ....................................... 4-3
General Programming Requirements .............................................................................. 4-4
Other Programming Points................................................................................ 4-4
Appendix A
Specifications
Hardware Specifications.................................................................................................. A-1
Software Specifications ................................................................................................... A-3
Appendix B
Forcing Windows 95 to Detect the Serial Hardware
Appendix C
Serial Port Information
RS-232 ............................................................................................................................. C-1
RS-422 ............................................................................................................................. C-1
RS-485 ............................................................................................................................. C-2
Serial Communication Issues .......................................................................................... C-3
Duplex Architectures ........................................................................................ C-3
Termination ....................................................................................................... C-4
Bias Resistors .................................................................................................... C-5
DTE vs. DCE .................................................................................................... C-6
Appendix D
Uninstalling the Serial Hardware and Software
Removing the Hardware Information.............................................................................. D-1
Uninstalling the NI Serial Software ................................................................................ D-3