Tuesday, September 30, 2008

Performance PCIe based RS-422/RS-485 Serial ExpressCards

PCIe ExpressCard to RS-422 RS-485Synchrotech is now offering Quatech's 1, 2, and 4 port PCIe based ExpressCard to RS-422 and RS-485 Serial host adapters. Advantages of a PCIe-based ExpressCard design are in the interface to the laptop's motherboard. The PCIe bus interface is the successor to the PCI bus, which in turn was the successor to the ISA bus to which built-in serial ports were originally attached. As such, the ExpressCard adapter design utilizes a PCIe-based design and can still directly use I/O space addresses and interrupts, thus more closely emulating built-in ports than can be done via USB-based design. Moreover, because there's no USB stack for the drivers to contend with, throughput can be higher and latency will be lower (considerably so in many cases). Due to improved data transfer rate, the ExpressCard is considerably more efficient for multi-tasking operations.

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