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PCI Express Multi-Port Multi-Protocol Low Profile Serial Communication Cards


  • Eight or four-port PCI Express serial communication cards
  • Serial protocol (RS-232/422/485) SOFTWARE CONFIGURED per port, stored in EEPROM for auto-configure at next boot
  • Low profile PCIe MD2 form factor
  • High performance 16C950 class UARTs with 128-byte FIFO for each TX and RX
  • Supports data communication speeds up to 921.6kbps (standard model RS-232 is 460.8kbps)
  • ±15kV ESD protection on all signal pins
  • Full modem control signals
  • Software compatible with all operating systems
  • Jumper selectable termination per port for RS-485 applications
  • 3' breakout cable included, terminating with industry-standard DB9M connectors (no external breakout box required)


  • Connector strengthening bracket for secure and fail-proof cable connections
  • Extended temperature operation (-40°C to 85°C)
  • High-speed RS-232 version up to 921.6kbps
  • RoHS compliant version
  • Remote wake-up enable
  • Low profile bracket installed for small, embeddeded PCs

ACCES I/O's PCI Express multi-port multi-protocol serial communication cards deliver eight (PCIe-COM-8SM) or four (PCIe-COM-4SM), high-speed serial communication ports for use in a wide variety of applications. The cards were designed to offer serial compatibility with the PCI Express bus and to be used by system integrators and manufacturers in the design of industrial and commercial systems. Each COM port is capable of supporting data rates up to 921.6kbps and implements full modem control signals to ensure compatibility with a broad variety of serial devices. Existing serial peripherals can connect directly to the industry standard DB9M connectors which are provided on the breakout cable that ships with each card. The card features a x1 lane PCI Express connector which can be used in any available x1, x2, x4, x8, x12, or x16 PCI Express expansion slot.

The card is 6.6 inches in length and 2.2 inches seated height and complies with the MD2 Low Profile Form Factor specifications. Low profile PCI Express allows the design of small footprint, low profile systems while still offering expandability and upgradeability to the end user. A regular profile mounting bracket is installed for use in standard size computers, while an optional low profile bracket is provided for smaller systems which require the use of low profile PCI Express cards.

Available accessories include a broad range of cables, screw terminal boards and breakout connection boxes for a variety of quick and easy connectivity options.


Custom baud rates are available upon request. Please contact ACCES with your precise requirement. Other examples of special orders would be conformal coating, custom software, RJ45 connectivity, longer breakout cables, etc., we will work with you to provide exactly what is required.


A complete driver support package is provided including an easy-to-use Windows terminal program for testing out your COM ports. This simplifies the verification of proper COM port operation. The card installs as standard COM ports in all operating systems including DOS, Linux (including Mac OS X) and Windows 2000/XP/2003.


Asynchronous Communications Interface

  • I/O connection: VHDCI 68 pin SCSI connector
  • Serial ports: 8 RS-232/422/485
  • Serial data rates: RS-232 460.8k (921.6 avail), RS-422/485 921.6k baud
  • UART: Octal type 16C950 with 128-byte transmit & receive FIFO, 16C550 compliant
  • ESD Protection: ±15kV on all signal pins
  • Character length: 5, 6, 7, or 8 bits
  • Parity: Even, Odd, None, Space, Mark
  • Stop interval: 1, 1.5, or 2 bits
  • Flow Control: RTS/CTS and/or DSR/DTR, Xon/Xoff
  • Cable: 3' shielded breakout cable terminated with 8 male D-sub 9-pin connectors


  • Operating temperature: Commercial: 0°C to 70°C
  • Industrial: -40°C to 85°C
  • Storage temperature: -65°C to 150°C
  • Humidity: 5% to 95%, non-condensing
  • Power required: 3.3VDC @ 0.9W (typical)
  • Size: 6.6 inches long x 2.20 inches high, (167.64 mm long x 55.8 mm high)
Model Price (USD)
PCIe-COM-8SM 549.00
PCIe-COM-4SM 349.00
PCIe-COM-8SMNC 519.00
PCIe-COM-8SM PCI Express eight-port RS-232/422/485 serial card with 3' DB9M breakout cable
PCIe-COM-8SMNC PCI Express eight-port RS-232/422/485 serial card without cable
PCIe-COM-4SM PCI Express four-port RS-232/422/485 serial card with 3' DB9M breakout cable
PCIe-COM-4SMNC PCI Express four-port RS-232/422/485 serial card without cable
-F Fast version (RS-232 up to 921.6kbps)
-T Extended Temperature Operation (-40° to 85°C)
-RoHS RoHS compliant version
-W Remote wake-up enable
-L Low profile bracket installed

Available Datasheets


Further information about available ACCES Software:

Drivers And Operating Systems
What drivers and other support we provide for various operating systems.

Setup Programs, Samples, And Utility Software
A description of the software package that comes with each ACCES card.

Redistributing Windows Drivers
A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.

Custom Software Services
A description of some of our custom software offerings. Did you know we offer free programming services to qualifying customers?


USA Office

Address: 1480 Gulf Road, Suite 837,
PO Box 1364
Point Roberts, WA 98281

Western Canada - Vancouver BC

Tel:1.800.663.6001 or 1.604.925.6150
Address: 2454 Haywood Ave
West Vancouver, BC V7V 1Y1

Eastern Canada - Markham, Ontario

Tel:1.800.465.0164 or 1.905.513.7027