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PCIe-COM-4SMDB and RJ Family

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PCI Express 4 and 2-Port RS-232/422/485 Serial Communication Cards

US Prices
CDN Prices

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  • Four and two-port PCI Express serial communication cards with on board DB9M or RJ45 connectivity
  • Serial protocol (RS-232/422/485) SOFTWARE CONFIGURED per port, stored in EEPROM for auto-configure at next boot
  • High performance 16C950 class UARTs with 128-byte FIFO for each transmit and receive buffer
  • Supports data communication speeds up to 3Mbps (standard model RS-232 is 460.8kbps)
  • ±15kV ESD protection on all signal pins
  • Supports 9-bit data mode
  • Full modem control signals in RS-232 mode
  • Software compatible with all operating systems
  • Selectable termination for RS-485 applications

pcie rs-232



  • Extended temperature operation (-40° to 85°C)
  • High-speed RS-232 version up to 921.6kbps
  • RoHS compliant version
  • Remote wake-up enable on COM ADescription
  • Specifications
  • Manuals / Software
  • Ordering Information

ACCES I/O's PCI Express multi-port multi-protocol serial communication cards deliver four (PCIe-COM-4SMDB, PCIe-COM-4SMRJ) or two (PCIe-COM-2SMDB, PCIe-COM-2SMRJ), 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 3Mbps and implements full modem control signals in RS-232 mode to ensure compatibility with a broad variety of serial devices.

Perfect for existing serial peripherals to connect directly to the industry standard pin-out of the DB9M connectors or via a RJ45 connector. 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.

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


Please contact ACCES with your precise requirement. Examples of special orders would be conformal coating, custom software, 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 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 32-bit and 64-bit Windows.


Asynchronous Communications Interface

  • I/O connection: DB9 or RJ45
  • Serial ports: 4 (or 2) RS-232/422/485
  • Serial data rates: RS-232=460.8k (921.6k avail); RS-422/485=3Mbps
  • UART: Quad type 16C950 with 128-byte transmit & receive FIFO, 16C550 compliant
  • ESD Protection: ±15kV on all signal pins
  • Character length: 5, 6, 7, 8, or 9 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


  • 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 @ 0.8W (typical)
  • Size: 4.722" long x 3.375" high (120 mm long x 85.725 mm high)

Available Reference Manuals

Available Software Downloads

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?

OEM and volume pricing available, please call us.  

Model Price (USD)
PCIe-COM-4SMRJ 339.00
PCIe-COM-4SMDB 329.00
PCIe-COM-4SRJ 309.00
PCIe-COM-4SDB 299.00
PCIe-COM232-4RJ 269.00
PCIe-COM232-4DB 259.00
PCIe-COM-2SMRJ 269.00
PCIe-COM-2SMDB 259.00
PCIe-COM-2SRJ 239.00
PCIe-COM-2SDB 229.00
PCIe-COM232-2RJ 189.00
PCIe-COM232-2DB 179.00
PCIe-COM-4SMRJ PCI Express four-port RS-232/422/485
PCIe-COM-4SMDB* PCI Express four-port RS-232/422/485
PCIe-COM-4SRJ PCI Express four-port RS-422/485
PCIe-COM-4SDB* PCI Express four-port RS-422/485
PCIe-COM232-4RJ PCI Express four-port RS-232 only
PCIe-COM232-4DB* PCI Express four-port RS-232 only
PCIe-COM-2SMRJ PCI Express two-port RS-232/422/485
PCIe-COM-2SMDB PCI Express two-port RS-232/422/485
PCIe-COM-2SRJ PCI Express two-port RS-422/485
PCIe-COM-2SDB PCI Express two-port RS-422/485
PCIe-COM232-2RJ PCI Express two-port RS-232 only
PCIe-COM232-2DB PCI Express two-port RS-232 only
ADAP9 Screw terminal adaptor (single DB9 female to 9 screw terminals)
ADAP9-2 Screw terminal adaptor (dual DB9 female to 18 screw terminals)
-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
* Please note: 4-port "DB" equipped cards require a (provided) cable-to-second-backplate accessory.


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