User Manual

Introduction
Sealevel Systems COMM+4.PCI Page 1
Introduction
Overview
The Sealevel COMM+4.PCI is a four channel RS-232/485/422 PCI Bus serial
I/O adapter supporting data rates up to 460.8K bps.
The RS-232 compatibility allows for connection to devices utilizing the RS-232
electrical interface, such as modems, data-entry terminals, and plotters.
RS-422 provides excellent communications for long distance device connections
up to 4000ft., where noise immunity and high data integrity are essential.
RS-485 is optimized for ‘Multi-Drop’ or ‘Party-line’ operations selecting data
from multiple peripherals (as many as 31 devices can be connected on an
RS-485 bus).
In both RS-485 and RS-422 modes, the card works seamlessly with the standard
operating system serial driver. In RS-485 mode, our special auto-enable feature
allows the RS-485 ports to be viewed by the operating system as a COM: port.
This allows the standard COM: driver to be utilized for RS-485 communications.
Our on-board hardware automatically handles the RS-485 driver enable.
What’s Included
The COMM+4.PCI is shipped with the following items. If any of these items is
missing or damaged, contact the supplier.
• COMM+4.PCI Serial I/O Adapter
• Sealevel Software
• “Spider” Cable providing 4 DB-9 connectors
Factory Default Settings
The COMM+4.PCI factory default settings are as follows:
Port # Clock DIV Mode Enable Mode
Port 1 4 RS-422
Port 2 4 RS-422
Port 3 4 RS-422
Port 4 4 RS-422
To install the COMM+4.PCI using factory default settings, refer to Installation
on page 7.