Log In

Celebrating 43 Years

Follow us on Facebook for all the latest news, updates and promotions


Credit Cards Accepted

website security

DSP 200/300 Lisalogo.gif (1748 bytes)

 RS-422/485 Serial PCMCIA Cards 
dsp 200/300 image

US Prices
CDN Prices

Privacy and Security





  • 1, 2, or 4 independent serial ports
  • Each port configurable as either RS-422 or RS-485
  • Speeds up to 921.6 kbps
  • Auto enable/disable of RS-422/485 transmitter
  • Full duplex and half duplex modes supported
  • Low power requirements
  • Windows 95-XP, Windows CE, Linux support
  • 5 year warranty


Quatech RS-422/485 asynchronous serial PCMCIA cards are an ideal solution for adding additional ports to full and half duplex multi-drop systems. Because they share electronic fundamentals with native bus architectures such as PCI and ISA, they function exactly like standard COM ports and can be addressed as such by most application software. In addition, their small size and the fact that the card itself can be left inside the computer at all times, make them practical choices for the most ported portable systems.

Quatech RS-422/485 serial PCMCIA cards provide many unique features that make them particularly robust and easy to use. Each of the ports is configurable as RS-422 or RS-485, and on multiport cards any combination of RS-422 and RS-485 ports can be used. For high performance is heavy multi-tasking environments, the cards are implemented with 16750 UARTs containing 64-byte FIFOs. This along with Quatech's special clock-multiplying feature enables data transfer rates as high as 921.6 kbps. (4-port cards still use 16550 UARTs for standard 115.2 kbps speeds, but are due for an upgrade soon.) They also provide a unique Auto-Toggle mode by which the hardware itself can regulate data flow in Half-Duplex mode by only driving lines while actively transmitting--providing increased speed and convenience over the older software controlled method. In addition, the cards also conserve system resources with their low power requirements that maximize battery life. They also have selectable and shareable interrupts, further extending a portable or handheld system's limited resources. And their multi-platform operating support makes them the single practical choice for a diverse fleet of portable systems.

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