Owner's manual

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Introduction

1.6 Overview of C485

1.6.1 What is C485?

The C485 is an enhanced four ports serial communication card used for PC

with PCI bus. It includes a PGA to support the serial communication

controller and a 37-pin connector to connect external I/O port.

The expansion cable has four standard DB25 connectors and one DB37

connector to connect to C485 interface card.

1.6.2 Feature of C485

• PCI Rev.2.1 Plug and Play

• IRQ and IO address automatically assigned by PCI plug-n-play

• 4 communication ports intelligent buffer

• Suitable for modems, data display, data collection,

telecommunication

• Supports up to 2 cards/8 ports per system

• Supports Windows 95/98, NT operation system

• Isolated RS-422/485 interface for each port independently

1.6.3 Specification of C485

♦ Compliant with PCI Spec.2.1

♦ Serial communication controller:

• 16C550A compatible

• 1.8432 ~ 7.3728 MHz

♦ System IO mapping:

• Assigned by PCI BIOS

• Shared IRQ

♦ Flow control

• Xon/Xoff control