RocketPort ® EXPRESS Quadcable DB25M

This RocketPort EXPRESS Quadcable DB25M multi-port serial card is designed for standard and low-profile PCs and servers, and has serial communication speeds up to 921 Kbps

Part Number: 30127-1

  • PCI Express Serial x1, x2, x4, x8, x12 and x16 lane connectivity
  • Low-profile or standard height compatible
  • RS-232, RS-422, RS-485 software-selectable serial ports
  • High performance serial port expansion with communication speeds up to 921 Kbps
  • Support for the most popular Windows operating systems (including Windows® 10) and Linux kernels
  • Windows driver, which can be configured for interrupt or polling mode
  • Free troubleshooting tools in the event you want to diagnose an issue:
    • Hardware diagnostics
    • LCOM (Linux tool for testing serial ports)
    • Comtrol Utility, which includes Test Terminal (WCOM2) for serial port testing and Port Monitor for monitoring ports

The RocketPort EXPRESS Quad DB25M is a four port serial adapter that is compatible with systems that have x1, x2, x4, x8, x12 or x16 PCI Express expansion slots. The card is designed for standard and low-profile PCs and servers and ships with a low-profile and a standard-height bracket. The product provides support for software-selectable RS-232/422/485 serial communications and data transmission speeds up to 921 Kbps. Serial connections are made utilizing an external fan-out quadcable with four DB25M connectors that is included with the product. All RocketPort EXPRESS products are European RoHS directive compliant.

View Engineering Drawing

  • RocketPort Express Quad DB25 Device
  • DB25M Quad Cable 42"
  • Loopback Plug
  • Bracket (1)
  • Maximum Cards/System 4
  • Bus Interface Specification PCI Express (PCIe) x1, x2, x4, x8, x12, x16-Lane Compatible
  • Board Dimensions 4.7" x 2.6" (Low-profile)
    119.4 x 66 mm
  • Product Weight 9.4 oz
    266.49 g
Electrical Specifications
  • Current Consumption
    • +3.3VDC 910 mA
  • Power Consumption (maximum) 3.1 W
  • ESD Surge Protection Provides minimum of 15KV for a duration of 1ns @ 200A.
Environmental Specifications
  • Air temperature
    • System On 0 to 60° C
    • System Off -20 to 85° C
  • Operating Humidity (non-condensing) 5% to 95%
  • Altitude 0 to 10,000 Feet
    3,048 m
  • Heat Output 10.6 BTU/Hr
  • MTBF (Mean Time Between Failures) 48.7 Years

Serial Communications

  • Software Selectable RS-232, RS-422, or RS-485
  • Baud Rate 300 bps to 921.6 kbps
    • Receive Buffer 512 bytes
    • Transmit Buffer 512 bytes
  • Device Driver Data Control
    • Data Bits 5, 6, 7, or 8
    • Parity odd, even, none, mark or space
    • Stop Bits 1, 1.5, or 2
    • Flow Control HARDWARE or SOFTWARE
    • Ring Indicator YES


  • Manufacturer's Warranty 5 Years
Export Information
  • Packaged Shipping Weight 1.60 lbs
    0.73 kg
  • Package Dimensions 9.25" x 2.5" x 7.25"
    235 x 63.5 x 184.2 mm
  • UPC Code 7-56727-30127-1
  • Country of Origin USA
  • ECCN EAR99
  • Schedule B Number 8471.80.1000

Device Drivers

  • Linux
  • 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
Regulatory Approvals
  • Emissions Canadian EMC requirements
    European Standard EN55022
    FCC Part 15 Subpart B
    Class B limit
  • Immunity European Standard EN55024
    IEC 1000-4-2/EN61000-4-2: ESD
    IEC 1000-4-3/EN61000-4-3: RF
    IEC 1000-4-4/EN61000-4-4: Fast Transient
    IEC 1000-4-5/EN61000-4-5: Surge
    IEC 1000-4-6/EN61000-4-6: Conducted Disturbance
    IEC 1000-4-8/EN61000-4-8: Magnetic Field
    IEC 1000-4-11/EN61000-4-11: Dips and Voltage Variations
  • Safety IEC 60950/EN60950
    CSA C22.2 No. 60950/UL60950 Third Edition
  • Other Regulatory Approvals

  • Pinout Diagram

    DB25M Pinout

Find a Distributor

» Industrial Distributors
» North American Distributors
» International Distributors

Pre-Sales Questions

Comtrol's Pre-sales Team
For sales questions or to locate a reseller near you.

+1-800-926-6876 (1-800-Go Rocket)
Fax: +1-763-957-6001

Comtrol's Industrial Automation Sales
For sales questions or to locate an industrial distributor near you.

+1-800-926-6876 (1-800-Go Rocket)
Fax: +1-763-957-6001

DocumentDescriptionDownload File
RocketPort ® EXPRESS Quadcable DB25M User GuideContains detailed installation procedures and configuration information.
Product Support and Service Information

Part Number: 30127-1

Sales Support

Call +1.763.957.6000, or e-mail

Technical Support

For technical assistance, our U.S.-based technical support team is only a phone call away.

Call +1.763.957.6000, or visit our forum .


Comtrol offers a 30-Day satisfaction guarantee and a 5-year limited warranty on all RocketPort EXPRESS family products!

View Warranty

Extended Warranty Available

Software & Drivers
» Comtrol FTP Site