Page - vii
Table of Contents
Chapter 1: Introduction ............................................................................................. 1-1
List of Figures
Figure 1-1: PCI-RS422 Block Diagram .................................................................................................... 1-3
Figure 3-1: PCI-COM422/485 Option Selection Map ................................................................................ 3-2
Figure A-1: Typical RS485 Two-Wire Multidrop Network ............................................................................ A-3
List of Tables
Table 5-1: Baud Rate Divisor Values ....................................................................................................... 5-1
Table 6-1: Connector Pin Assignments ..................................................................................................... 6-1
Table A-1: Connections Between Two RS422 Devices .............................................................................. A-1
Table A-2: RS422 Specification Summary ................................................................................................. A-2
Revision 1B
December 2000
Balanced Mode Operation and Load Termination ................................................................................ 1-1
COM Port Compatibility ..................................................................................................................... 1-1
Chapter 2: Installation ............................................................................................... 2-1
Chapter 3: Option Selection ...................................................................................... 3-1
Chapter 4: Address Selection ................................................................................... 4-1
Chapter 5: Programming .......................................................................................... 5-1
Chapter 6: Connector Pin Assignments .................................................................. 6-1
Appendix A: Application Considerations ............................................................... A-1
Communication Modes ...................................................................................................................... 1-2
Auto -RTS Transceiver Control ........................................................................................................... 1-2
Specifications .................................................................................................................................... 1-2
CD Installation ................................................................................................................................... 2-1
Directories Created on Hard Disk ....................................................................................................... 2-2
Installing the Card .............................................................................................................................. 2-4
Input/Output Connections .................................................................................................................. 2-5
Sample Programs .............................................................................................................................. 5-1
Initialization ....................................................................................................................................... 5-3
Reception .......................................................................................................................................... 5-3
Transmission ..................................................................................................................................... 5-5
ACCES32.DLL ................................................................................................................................... 5-4
32-Bit VB 4.0 Example Code ............................................................................................................. 5-5
Balanced Differential Signals .............................................................................................................. A-1
RS-485 Data Transmission ................................................................................................................ A-3
