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PCI Express Dual RS-232 Serial Port Card.
Koutech Systems
Dual RS232 Serial Port PCI Express Card, with both Regular and Low-Profile brackets
Koutech Systems
Single Port Parallel PCI Express Card
Koutech Systems
Dual Serial PCI (16550) (2x9pin) Ports.
Koutech Systems
RS232 Serial Port Express card PCMCIA, add a serial port to your new Laptop
Koutech Systems
Mini PCI Express 2-Port RS-232 16C950 Serial Card
Koutech Systems
2-Port RS-232 Serial PCI Express (x1) Card
Koutech Systems
Single RS-232 Serial Port CardBus PC Card
Koutech Systems
PCIe 2 Serial & 1 Parallel Host Card
VANTEC
Using a USB to RS232 Serial adapter will work in many situations. As long as the needed RS232 parameters are very standard,these will normally work.
PCI and PCMCIA cards are necessary when the required RS232 parameters are a bit more unusual. What are the parameters you ask? BAUD Rate, Data Bits, Stop Bits, Parity, and Flow Control. The most generic setup is: 9600 BAUD, 8 Data Bits, 1 Stop Bit, Parity - None, and None or Xon/Xoff for Flow Control. You have to set Serial ports up in Device Manager. One tricky part is that Serial Ports are assigned to "COM" ports depending on what I/O port and IRQ values the hardware gets set to. You can usually change these values within the Computers BIOS setup.
Not so hard to see why USB rules now?! RS232 is still widely used for Industrial PC Automation and Data Collection among other things.
