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Our new line of USB analog input modules are NOW SHIPPING!

The wait is over for those of you looking for a 12 or 16-bit, 16-channel, multifunction USB analog input board.

With speeds up 500kHz, autocalbration, and real-time calibration, these boards also feature our popular USB/104 form factor.

 Prices start under $350USD, check them out here!

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

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  • 4 and 2-port PCI Express serial communication cards with DB9M connectivity
  • 2kV isolation port-to-port and port to computer on ALL signals
  • 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 (RS-232 up to 921.6 kbps)
  • Virtually any custom baud rate may be configured by the user via register settings, no custom oscillator needed
  • ±15kV ESD protection on all signal pins
  • 9-bit data mode and RS-485 full-duplex (4-wire) fully supported
  • Full modem control signals in RS-232 mode
  • Software compatible with all operating systems
  • Selectable termination for RS422 or RS-485 applications


  • High-speed RS-232 version up to 921.6kbps
  • Extended temperature operation (-40°C to 85°C)
  • RS-422/485 only versions
  • Remote Wake-Up Enable
  • RoHS compliant version

The PCIe-ICM Series are a new family of isolated PCI Express serial communication cards. These PCI Express cards feature a selection of 4 or 2-ports of isolated, software selectable, RS-232, RS-422, and RS-485 serial protocols. 2kV isolation is provided between channels and between the PC and bus lines on ALL signals. The cards feature a x1 lane PCI Express connector which can be used in any available x1, x2, x4, x8, x12, or x16 PCI Express expansion slot.

Each RS-232 port is capable of supporting data communication rates up to 921.6 kbps and implement full modem control signals to ensure compatibility with a broad variety of serial devices. RS-422 and RS-485 modes support data communication speeds up to 3 Mbps. Existing serial peripherals can connect directly to industry standard DB9M connectors which are provided on-board each card.

The PCIe-ICM cards were designed using type 16C950 UARTS and use 128-byte transmit/receive FIFO buffers to decrease CPU loading and protect against lost data in multitasking systems. New systems can continue to use legacy serial peripherals, yet benefit from the use of the high performance PCI Express bus. The cards are fully software compatible with current PCI 16550 type UART applications and allow for users to maintain backward compatibility.

The PCIe-ICM Series is especially useful in applications where high common-mode external voltages are present. Isolation is required to guard electronics from transient voltage spikes and offers greater common-mode noise rejection in electrically noisy surroundings containing industrial machinery and inductive loads. These applications include factory automation, energy management, military/mission-critical, industrial ON/OFF control, security systems, manufacturing test, process monitoring, and kiosks. In addition to protecting industrial applications from accidental contact with high external voltages, the isolation provided eliminates troublesome ground loops.

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


  • Retail
  • Hospitality
  • Automation
  • Medical
  • Gaming
  • Shipboard
  • Defense
  • Point of Sale (POS)
  • Kiosks


Please contact ACCES with your precise requirement. Examples of special orders would be conformal coating, custom software, RJ45 connectivity, etc.


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 cards install as standard COM ports in all operating systems including DOS, Linux (including Mac OS X) and Windows 2000/XP/2003/Vista/7 (32 and 64-bit).

pcie-icm-4sm block diagram

Asynchronous Communications Interface

  • I/O connection: DB9
  • Serial ports: 4 (or 2) RS-232/422/485
  • Isolation: 2000V port to port, port to computer
  • 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), 12VDC @ 0.9W (typical)
  • Size: 6.600" long x 4.200" high (167.65 mm long x 106.68 mm high)

OEM and volume pricing available, please call us.  

Model Price (USD)
PCIe-ICM-4SM 479.00
PCIe-ICM-4S 439.00
PCIe-ICM-232-4 349.00
PCIe-ICM-2SM 349.00
PCIe-ICM-2S 329.00
PCIe-ICM232-2 269.00
PCIe-ICM-4SM* Isolated PCI Express four-port RS-232/422/485
PCIe-ICM-4S* Isolated PCI Express four-port RS-422/485
PCIe-ICM-232-4* Isolated PCI Express four-port RS-232 only
PCIe-ICM-2SM Isolated PCI Express two-port RS-232/422/485
PCIe-ICM-2S Isolated PCI Express two-port RS-422/485
PCIe-ICM-232-2 Isolated 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.

Available Reference Manuals

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 1280
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
Address: 3075 14th Ave, Unit 219,
Markham, Ontario L3R 0G9