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mPCIe-ICM422-4, mPCIe-ICM422-2 and mPCIe-ICM422-1

Four, two, and single-port isolated RS422 PCI Express Mini Cards



  • PCI Express Mini Card (mPCIe) type F1, with latching I/O connectors
  • 4, 2, or 1-port mPCIe RS422 serial cards with optional DB9M connectivity
  • 500V isolation port-to-port and 1500V isolation port-to-computer on ALL signals
  • High performance 16C950 class UARTs with 128-byte FIFO for TX and RX buffering
  • Supports data communication rates as high as 3Mbps - 12MHz with custom crystal
  • Port-by-port customer configurable termination
  • 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
  • Supports 9-bit data mode
  • RoHS and Industrial Temperature (-40°C to 85°C) both standard



The mPCIe-ICM422 family of cards feature high performance 16C950-class UARTs. Available in 4-port (mPCIe-ICM422-4), 2-port (mPCIe-ICM422-2) and 1-port (mPCIe-ICM422-1) versions, each port is capable of communication speeds as high as 3Mbps and has 128-byte deep transmit and receive FIFOs. Large FIFOs protect against data loss in multitasking operating systems, reduce CPU utilization, and improve data throughput, while reducing or eliminating inter-character or inter-packet pauses. The advanced integrated circuit with pre-scalar supports a wide variety of custom baud rates, and any rates not otherwise achievable can be supported via a custom factory-installed crystal oscillator (up to 12Mbps!).

Tru-Iso™ port-to-port and port-to-PC isolation provides a robust solution to common signal level and grounding issues when using long cables to connect computers and other powered devices - up to 500V of difference between pins and adjacent ports and 1500V between each port and the host computer.

Communication is possible either with custom application software, with off-the-shelf applications (such as HyperTerminal), or with provided samples and utilities, including WinRISC™ (“Windows Really Incredibly Simple Communication).

The serial ports on the device are accessed using a low-profile, latching, 5-pin Hirose connector. Optional breakout cables are available, and bring each port connection to a panel-mountable DB9-M connector.


The mPCIe-ICM422 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 surroundings containing industrial machinery and inductive loads. These applications include factory automation, energy management, industrial ON/OFF control, security systems, manufacturing test, and process monitoring. Careful attention has been paid to isolation design, including extensive keep-out zones and hand-routed circuit paths, as well as component and material selection. The mPCIe-ICM422 Series can be used in the following markets.

  • Health and Medical Systems
  • Point of Sale (POS)
  • Automated Retail Kiosks
  • Embedded Systems
  • Traffic Systems
  • Factory Automation and Process Control
  • Retail
  • Hospitality
  • Gaming
  • Kiosks


Our Tru-Iso™ products are designed under IPC-221B. The circuit is isolated with a ≥ 300mil gap between all signal and plane layers between the ports and the PC, and a ≥ 100mil gap port to port. These gaps are rated under IPC-221B at 1500V (Port to PC) and 500V (Port to Port). Our circuit uses a chip-level high-frequency DC-DC isolator which is rated at 2500VRMS for 1 minute under UL 1577. This isolation component has an over 50 year isolation lifespan even if the isolation voltage potential is in excess of 350 volts AC. TRU-ISO™, for true signal isolation.

Accessories and Connections

Available accessories include 4 or 2-port DB-9 cable kits and screw terminal board for quick and easy connectivity. The ADAP9 accessory provides a screw terminal connection to break out the RS422 signals on the DB9M connector. I/O is accessed via Hirose DF57 5-pin latching connectors on the card.


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. Additional drivers may be available for a wide variety of operating systems including Windows CE, please contact the factory for compatibility with your specific OS.



PC Interface

  • PCI Express Mini Card: Type F1 "Full Length" V1.2

Communications Interface

  • Connector
    • I/O: Hirose DF57-5P-1.2V 5-pin, latching
    • Mating: Hirose DF57H-5S-1.2C
  • Serial Ports: 4 (or 2) RS-422
  • UART: Quad 16C950 with 128-byte FIFO for each transmit & receive buffer
  • Baud Rates: Up to 3M baud (advanced-prescaler allows a wide variety of unusual baud rates to be achieved. Up to 12Mbps via custom crystal option.)
  • Character length: 5, 6, 7, 8 bits (contact factory for assistance with 9-bit data)
  • Parity: Even, Odd, None, Mark, Space
  • Stop Interval: 1, 1½, 2 bits
  • Flow Control: Xon/Xoff, None


  • Operating Temperature: -40°C to 85°C
  • Storage Temperature: -65°C to 150°C
  • Humidity: 5% to 95%, non-condensing
  • Power required: 3.3VDC @ 1.6W (typical)
  • ESD Protection: ±15kV on all signal pins (IEC 61000)


  • Weight:6.4 grams
  • Size: length: 50.95mm (2.006″); width: 30.00mm (1.181″)

The 4-port model violates component height restriction on ″bottom″ side by up to 1.3mm. Confirm your host PC does not place components under the mPCIe footprint before ordering.


  • Tru-Iso
    • IPC-221B
    • Port-to-PC: 1500V peak (AC or DC)
    • Port-to-port: 500V peak (AC or DC)

Careful attention has been paid to isolation design, including extensive keep-out zones and hand-routed circuit paths, as well as component and material selection.

Regulatory Compliance

This product is designed to be in full compliance with CE requirements




Available Reference Manuals

View / Download the mPCIe-ICM485-4 Manual (.pdf)

Available Software Downloads

mPCIe-ICM485-4 Software Package

Available Datasheets

View / Download the mPCIe-ICM485-4 Data Sheet (.pdf)

Further information about available ACCES Software:

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.

Please call us to order


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