Serial Port Information
The following topics describe the RS-232, RS-422, and RS-485
standards and explain some of the issues involved with these types of
serial communication.
The following table lists the features of the RS-232, RS-422, and RS-485
standards.
RS-232, RS-422, and RS-485 Features
Feature
RS-232
RS-422
RS-485
Type of transmission lines
Single ended Differential
Differential
Maximum number of drivers
1
1
32
Maximum number of receivers 1
10
32
Maximum cable length
50 ft
4,000 ft
4,000 ft
Maximum data rate
20 kbytes/s
10 Mbytes/s 10 Mbytes/s
Maximum CMV
± 25 V
±7 V
+12 to –7 V
Driver output
5 to 25 V
2 to 6 V
1.5 to 6 V
Driver load
<3 k
100
60
Summary of Contents for PCI-8430
Page 1: ......
Page 5: ...Using Help Conventions Navigating Help Searching Help Printing Help File Topics...
Page 21: ...Serial Hardware Overview PCI Kits PXI Kits USB Kits ENET Kits ExpressCard Kits PCMCIA Kits...
Page 24: ...PCI 485I RS 485 two port isolated RS 485 four port isolated...
Page 27: ...PXI 8423 RS 485 two port isolated RS 485 four port isolated...
Page 63: ...Save Pending Changes To save your changes to this item click Save...
Page 98: ...0 LPVOID l_SerialInterface sizeof l_SerialInterface LPDWORD l_ByteCount NULL...
Page 127: ...2 PORT LEDs USB Serial Hardware LEDs...
Page 139: ...Connecting the Cables to a Four Port PXI Serial Board...
Page 141: ...67 58 50 41 33 24 16 7 TXD 9 RI 9...
Page 167: ......
Page 169: ......
Page 171: ......
Page 181: ...How many serial ports can I have on my machine You can have up to 256 serial ports...
Page 201: ...Glossary Prefixes Symbols A B C D E F G H I K L M P R S T U V...
Page 203: ...Symbols degrees ohms percent...
Page 204: ...A A amperes ANSI American National Standards Institute...
Page 205: ...B b bits B bytes baud bits per second bps bits per second...
Page 208: ...E EIA Electronic Industries Association EMI electromagnetic interference ENET Ethernet...
Page 209: ...F FCC Federal Communications Commission FIFO First In First Out ft feet...
Page 210: ...G G ground...
Page 211: ...H HSI handshake input HSO handshake output Hz Hertz...
Page 213: ...K Kbaud kilobits per second...
Page 214: ...L LED light emitting diode...
Page 215: ...M m meters MB megabyte...
Page 216: ...P PC personal computer PCI Peripheral Components Interconnect...
Page 218: ...S s seconds SCSI Small Computer Systems Interface...
Page 220: ...U UART Universal Asynchronous Receiver Transmitter...
Page 221: ...V V volts VDC volts direct current VXI VME eXtensions for Instrumentation...