Introduction - Measurement Computing PCI-COM422/485 Series User Manual

The PCI-COM422/485 family consists of one and two port, RS-422 and RS-485-compatible, serial I/O
boards designed to operate in computers with PCI bus accessory slots. The package includes complete
software drivers for Windows 95, 98 and NT that allow the boards to be installed as a standard "COM"
port in your computer.
The boards are fully plug-and-play and provide an independent UART for each port. An easy to use set
up application program allows the user to choose between RS-422 and RS-485 operation as well as to
enable the automatic transmitter enable mode in RS-485. The boards provide a maximum baud rate of
460.8 kbaud. All connections on the boards are made through DB9F connectors.
The available models are shown in the table below.
Board
PCI-COM422/485
PCI-COM422/485/S
PCI-COM422/485/2
PCI-COM422/485/2/S
On-Board Surge
Number of Ports Suppression
1
1
2
2
1

1. INTRODUCTION

FIFO
Depth
No 16 bytes
Yes 16 bytes
No 16 bytes
Yes 16 bytes