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Chapter 6 Using Your Serial Hardware
© National Instruments Corporation 6-3 Serial Hardware and Software for Windows
Two-Wire Mode: TXRDY Auto Control
In this mode, the serial hardware transparently enables the transmitter and
receiver in a two-wire system. Use this mode to remove the burden of flow
control from your application. By connecting the transmitter to the
TXRDY
(Transmit Ready) line, the hardware enables the transmitter for
each byte to be transmitted. Also, the hardware disables the receiver
whenever the transmitter is enabled, so you do not receive the packets sent
from your transmitter.
Note
When you are communicating with a two-wire device, National Instruments
recommends that you use the two-wire TXRDY
auto control mode. Because this mode
handles the transmitter/receiver enabling for a two-wire connection in your hardware,
it reduces the software overhead required to perform this operation in your application
program.
For more information about serial communication in two- or four-wire modes, refer to the
Serial Communication Issues sectioninAppendixB,Serial Port Information.
Setting the Transceiver Control Mode
Windows 2000
To set the transceiver control mode, use the Windows 2000 Device
Manager. For instructions on how to use the Device Manager, refer to the
chapter with installation instructions for your hardware platform. The mode
you select in the Device Manager is automatically configured when you
open a port on a serial interface.
Windows Me/9x
To set the transceiver control mode, use the Windows Me/9x Device
Manager. For instructions on how to use the Device Manager, refer to
chapter with installation instructions for your hardware platform. The mode
you select in the Device Manager is automatically configured when you
open a port on a serial interface.
You can also set the hardware transceiver control mode from within a DOS
application. For each port you want to control, write the control byte for the
mode you want to select to the scratch register of the UART. Table 6-2
shows the control bytes for each mode.
- Serial Hardware and 1
- Software for Windows 1
- User Manual 1
- Important Information 3
- Compliance 4
- Chapter 4 7
- Chapter 3 7
- Contents 10
- About This Manual 12
- Related Documentation 13
- FIFOs, National Semiconductor 14
- EXAR Corporation 14
- Introduction 15
- What You Need to Get Started 16
- Optional Equipment 17
- Serial Hardware Overview 17
- PXI Kits 18
- Chapter 1 Introduction 19
- PCMCIA Kits 20
- NI-Serial Software Overview 22
- Time-Saving Development Tools 22
- Figure 2-3 30
- Advanced Settings 31
- Figure 2-6 36
- Transceiver Mode 54
- Use FIFO Buffers 54
- FIFO Buffer Size 68
- Configuration 69
- Figure 4-6 79
- FIFO Enabled 89
- FIFO Buffers 89
- PCMCIA-232/2, PCMCIA-485/2 91
- Windows Me/9x 100
- Install the Hardware 101
- Figure 5-5 102
- AT Serial Board Installation 102
- Verify the Installation 103
- Verify the Hardware Resources 104
- Run the Diagnostic Test 105
- Port Settings Tab 107
- Advanced Port Settings 108
- Windows NT 109
- Install the Serial Hardware 110
- General Port Settings 114
- Resources 115
- Resource Settings 115
- AT Boards (Shared IRQ) 116
- AT Boards (Non-Shared IRQ) 117
- Using Your Serial Hardware 118
- Four-Wire Mode 119
- Two-Wire Mode: DTR with Echo 119
- Two-Wire Mode: DTR Controlled 119
- Windows 2000 120
- Windows NT/Me/9x 122
- Connector Descriptions 123
- DB-9 Connector 124
- Modular Jack Connector 125
- DB-25 Connector 126
- PCI serial board 127
- 68-Pin Connector 128
- Table A-4 129
- 100-Pin Connector 130
- Table A-5 131
- Serial Port Information 132
- Serial Communication Issues 134
- Half Duplex 135
- Termination 136
- Bias Resistors 136
- DTE vs. DCE 138
- Uninstalling the 139
- Hardware and Software 139
- PCI Hardware 140
- Uninstall the Software 141
- Uninstall the Hardware 141
- PXI Hardware 145
- PCMCIA Hardware 150
- AT Hardware 155
- Figure C-11 157
- Troubleshooting and 160
- Common Questions 160
- Address Test Failed 162
- Interrupt Test Failed 162
- PCI and PXI Boards 166
- AT Boards 166
- PCMCIA Boards 167
- \Windows\system 168
- PCI and PXI Hardware 170
- AT and PCMCIA Hardware 172
- Resolving Resource Conflicts 178
- WinNT\system32\drivers 179
- Specifications 183
- Four-Port Boards 184
- Isolated Four-Port Boards 184
- Eight-Port Boards 185
- 16-Port Boards 185
- Environmental Characteristics 186
- Software Characteristics 186
- PXI Serial Hardware 187
- PCMCIA Serial Hardware 190
- AT Serial Hardware 191
- Technical Support Resources 194
- Worldwide Support 195
- Glossary 197
- Numerics 199
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