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Comtrol Corporation > 
Item#: N82E16815520008

Comtrol RocketPort EXPRESS 4J 4-port Serial Adapter Card Model 31305-2

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  • Universal PCI design supporting 3.3 and 5.0 Volt PCI bus architectures
  • I/O mapping capabilities
  • 16-port serial expansion utilizing a single PCI slot
  • On-board dedicated 36MHz RISC processor

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

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.

Learn more about the Comtrol Corporation 31305-2


RocketPort EXPRESS 4J


PCI Express to Serial Port Card
External Ports
4 x RJ-45 RS-232/422/485 Serial
Data Transfer Rate
Up to 921.6 Kbps
Operating Systems Supported
Microsoft® Windows® 7
Microsoft® Windows® 2008 Server
Microsoft® Windows® Vista
Microsoft® Windows Server® 2003
Microsoft® Windows® XP
Microsoft® Windows NT® 4.0 (Legacy)
Microsoft® Windows® 2000 (Legacy)
FreeBSD® 5
FreeBSD® 6
QNX® 6.X
SCO OpenServer™ 5
SCO OpenServer™ 6
Bus Interface: PCI-Express x1


RJ45 multi-port serial expansion using a single PCIe slot maximizes host expansion capabilities; adds additional COM ports using only one slot

Low-latency communication supporting the widest variety of applications

PCI Express 4-Port serial card RJ45 features robust driver support that enables card to work seamlessly with popular operating systems - Windows, Linux, QNX

RS-232, RS-422, and RS-485 software-selectable

On-board dedicated 44MHz RISC processor minimizes 'host' CPU utilization

Edge-mounted RJ45 serial ports provide cost-effective, compact serial connections

Transmit and receive buffers 32 times larger than a standard 16550 UART-based serial card ensuring smooth, efficient data transfer.

Dimensions & Weight

4.7" x 4.0"
2.9 oz.
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 5 years
  • Limited Warranty period (labor): 5 years
  • Read full details

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Home > 
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Comtrol Corporation > 
Item#: N82E16815520008
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