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Appendix B Serial Port Information
© National Instruments Corporation B-7 Serial Hardware and Software for Windows
DTE vs. DCE
In the RS-232 specification, DTE (Data Terminal Equipment) and DCE
(Data Communications Equipment)
1
refer to the types of equipment on
either end of a serial connection. In general, DTE and DCE refer to
computer equipment and modems, respectively. Because the RS-232
specification mainly involves connecting a DTE directly to a DCE and vice
versa, the pinouts are defined so that cabling is simple. That is, a cable
connected a computer to a modem by wiring pin 1 to pin 1, pin 2 to pin 2,
and so on. This method is known as straight-through cabling.
Figure B-5 shows straight-through cabling in a DTE-to-DCE interface.
Figure B-5. Straight-Through Cabling in a DTE-to-DCE Interface
Straight-through cabling is still the standard method to connect a modem to
your PC. However, because many applications use serial communication to
connect two or more DTEs without modems, the cabling becomes more
complicated. If two DTEs are wired together using a straight-through cable,
one transmitter is connected to the other transmitter, and one receiver is
connected to the other receiver. In this setup, no transmissions can occur.
Thus, these applications must use a cabling scheme that connects the
transmitter on one device to the receiver on the other device and vice versa.
This method is known as null-modem cabling, because it replaces the two
modems that traditional RS-232 applications would require between the
two DTEs. To communicate from one serial port to another, use a
null-modem cable.
Figure B-6 shows null-modem cabling in a DTE-to-DTE interface.
Figure B-6. Null-Modem Cabling in a DTE-to-DTE Interface
1
In Revision D of the RS-232 specification, a DCE is a Data Circuit-Terminating Equipment.
Rx D
Tx D
Pin 3
Pin 2
DTE
Pin 3
Pin 2
DCE
Pin 3
Pin 2
DCE
Pin 3
Pin 2
DTE
Rx D
Tx D
Rx D
Tx D
Rx D
Tx D
Pin 2
Pin 3Pin 3
Pin 2
DTE DTE
- 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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