Comtrol RocketPort EXPRESS 4J 4-port Serial Adapter - 4 x RJ-45 RS-232/422/485 Serial PCI Express x1

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Manufactured by:
Comtrol Corporation
Out of stock
Genuine and factory sealed in box.
Valid for Canada only.
  • $447.00 CAD Regular Price:
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$357.99 CAD

Product Summary

Comtrol's RocketPort EXPRESS 4J serial port expansion card provides four "native" serial ports utilizing a single PCIe card slot and is compatible with all PCI Express bus architectures. The RJ45 serial ports, mounted on the edge of the card, support software configurable RS-232/422/485 serial communications at speeds up to 921.6 Kbps.

Every RocketPort serial card features the high-performance RocketPort processor chip, consisting of a dedicated 44MHz core that minimizes host CPU utilization and optimizes data transmission via larger transmit and- receive buffers than those of 16550 UART chips, commonly used in standard PC serial ports and low-end serial cards.

RocketPort technology enables these cards to outperform other serial expansion cards by handling the transmission of large amounts of data more reliably and efficiently.

Certified Windows drivers, support for the most popular operating systems, and readily available U.S.-based support makes the RocketPort 4J the perfect solution for projects requiring PC-based serial communication.

General Information

Product Type Serial Adapter
Manufacturer Part Number 31305-2
Manufacturer Website Address
Manufacturer Comtrol Corporation
Product Model 31305-2
Product Name RocketPort EXPRESS 4J 4-port Serial Adapter
Product Line RocketPort
Brand Name Comtrol

Technical Information

Host Interface PCI Express x1
Data Transfer Rate 921.60 Kbps


Ports 4 x RJ-45 RS-232/422/485 Serial

Physical Characteristics

Dimensions 4.0" Height x 4.7" Width
Weight (Approximate) 2.90 oz
Form Factor Plug-in Card


Package Contents
  • RocketPort EXPRESS 4J 4-port Serial Adapter
  • 1 x DVA
  • 1 x RJ45 Test Plug
  • Driver/Documentation CD
  • Diagnostic CD
  • Warranty

    Standard Warranty 5 Year Limited


    This product is shipped only within Canada and Warranty valid for Canada only.

    Computer Valley makes every effort to provide accurate specifications, descriptions, images and price on all products that are found on

    However for complete and updated descriptions, compatibilities, specifications and actual photo we recommend our clients to consult with manufacturer's websites or simply call us for proper clarifications. Computer Valley is not responsible and will not accept returns for items purchased that are not compatible with your system. Please ensure that you have verified compatibility and actual photo with your system by visiting the manufacturer's web site prior to purchase or give us a call to make sure what you are purchasing.

    For more information, visit our Shipping and Return policy.

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