User`s manual

CyberResearch
®
Serial Communications COMHP 7404/-D25
CyberResearch, Inc. 1
25 Business Park Drive P: [phone]; F: [phone]
Branford, CT USA www.cyberresearch.com
Introduction
Overview
The CyberResearch
®
COMHP 7404 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.
A quadracable splits the DB-37 connector on the backplate of the CyberResearch Adapter into four separate cables. On the
COMHP 7404, these four cables terminate in DB-9M connectors. On the COMHP 7404-D25, these four cables terminate in
DB-25M connectors.
What’s Included
The COMHP 7404 is shipped with the following items. If any of these items is missing or damaged, contact CyberResearch,
Inc.
• COMHP 7404 Serial I/O Adapter
• SeaCOM Software
• Quadracable Cable providing 4 DB-9 connectors (COMHP 7404)
• Quadracable Cable providing 4 DB-25 connectors (COMHP 7404-D25)
Factory Default Settings
The COMHP 7404 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 COMHP 7404 using factory default settings, refer to Installation on page 7.