Check the listing for details. Quatech/B&B Performance PCIe based RS-422/RS-485 Serial ExpressCards. Condition: New. Listed at 250.00 USD. Quatech/B&B's high performance ExpressCard 34 to Serial I/O cards adds fast serial COM ports to mobile computers for attaching fax/modems, bar code scanners, court reporters, data acquisition equipment, mag stripe readers, GPS receivers, digital cameras or other RS-422/RS-485 serial devices. Unlike other ExpressCard Serial adapters, Quatech/B&B's utilize the PCIe portion of the ExpressCard standard.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 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. The PXPseries support data rates of up to 921.6Kbps, which provides steady flow of data throughput. FeaturesTrue serial emulationNew generation of I/O expansion for notebooksAdds 1, 2 or 4 high-speed PCIe-based serial portsSupports PCI Express Base Specification Revision 1.1aBuilt-in 1024-byte FIFOs buffers increase data transmit/receive speedBaud rates up to 115.2 Kbps with 16550-based serial units (for SSPX model)Baud rates up to 921.6Kbps (for SSPXP and DSPXP models)Supports Windows XP/Vista/7 operating systemsHigh speed ExpressCard with plug-n-playHot plugging and how swapping featuresMeets FCC and CE safety standardsInstalls in any ExpressCard slotBus InterfaceExpressCard Standard: PCI Express based Designs Specification, Revision 1.1 compliant interfaceRS-422/485 FeaturesData FIFO: 1024-byteUARTS: 16450/550/750-compatible register setData Bits Supports 5, 6, 7, 8; Supports even, odd, mark, space and no parity; Supports 1, 1.5 and 2 stop bitsSupports full-duplex and RTS, DTR or automatic transmitter control half-duplexSelectable RTS/CTS, TxCLK/RxCLK or loopback auxiliary data pairTIA-400-B (RS-422) and TIA-485-A (RS-485) compliantFull fail-safe (open and short) 1/8 load receiversSelectable receiver control (echo/no echo)Baud RatesUp to 921.6kbps per portConnectorsSSPXP: Provides One (DB9 Male) RS-422/485 Serial Ports for device connectionsDSPXP: Provides Two (DB9 Male) RS-422/485 Serial Ports for device connectionsQSPXP: Provides Four (DB9 Male) RS-422/485 Serial Ports for device connectionsSystem Requirements PCExpressCard slot equipped computerWindows XP/Vista/7Standards ConformanceFCC, CEExpressCard 1.0 (PCIe)Physical CharacteristicsDimensions: 34 x 75 x 5mm (not including extended portion of card)Weight: 24g (approximate)Electrical Characteristics3.3V ± 0.3V directly from ExpressCard socket500mA (max.)Operating EnvironmentOperating temperature: 0° C to 55° CRelative Humidity: 90% (max.) non-condensingPackage IncludesExpressCard 34 to RS-422/RS-485 CardRS-422/RS-485 Serial Connectors, count depends on model