Serial communication is one of data communication means, safer and cheaper than parallel communication in distant communication. It has been widely used in computer and device communication since the dawn of computer spread.
Almost all facilities in industrial sites and manufacturing equipments in factories use serial communication as their default communication means.
PC only has one or two serial ports, thus the need for more PCs arises when connecting a number of devices to the PC. However, this method is neither cost-effective nor rational. PCs in general consist of an optional slot for such extension needs. There are many types of slots such as ISA/PCI BUS, USB, IEEE 1394, and still others. A serial “Multiport” mounts multiple serial ports on one board or one box, enabling installation on a PC option slot.

Multi-4,8/USB Series enables the connection of up to 4 or 8 asynchronous serial devices such as terminals, modems, printers, and scanners to make a PC an economical but a powerful multi-user and multi-device system. TXD and RXD LEDs are included in the product for the displays of data transmission. Transmission speed rises up to 921.6Kbpsper port, with the help of USB 2.0 specifications. Another remarkable feature is in its specialized design which converts the RI pin(pin #9) of DB-9 connector into a power of external power adapter, providing power to the external devices as needed. This feature can be fully exploited when connecting small peripherals such as cashregisters, barcode readers, or receipt printers to systems like PC POS.

• 1 ports per board
• RS232 or ALL(RS232/422/485 all-in-one)
• Serial Interfaces
• Serial communication speed of up to 921.6Kbps
• 16-byte FIFO and device driver control for RS422/485 auto toggling
• RI signal line power supply (Panel type, 5V or 12V power supplied)
• Built in 15KV ESD Protection
• Optional 2.5KV optical isolation protection for RS232/422/485
• Universal PCI compatible with 3.3/5V
• PCI and PCI-X
• MD1 Low profile board for compact-sized PCs
• Windows 2003/XP/2000/98/ME, Linux, and Unix driver support

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