Moxa Technologies PCI Express Board Instrukcja Użytkownika Pobierz pdf (Strona 3)

Extreme Serial Performance Technology

Extreme Serial Performance Technology

e-mail:info@moxa.com.tw www.moxa.com

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Why Use Multiport Serial Boards?

Multiport serial boards are installed in the slots

inside a PC. Slots are available for ISA, PCI,

PCI-X, and PC/104 busses, with each board

providing one or more serial ports. Today,

multiport serial boards are commonly used

for controlling external devices for different

applications, including industrial automation,

building automation, CNC machines, and more.

They can also connect to computer servers for

the purpose of monitoring and controlling the

server from a remote location. The boards were

once used mainly to connect many terminals

and/or modems to serial ports.

Multiport boards use different types of external

connectors, including DB9, DB25, and RJ45, to

connect devices (modems, terminals, etc.) to

a computer. Each physical device is connected

to its own serial port, and since the space on

the external part of the board is limited, there

is often not enough room to ﬁt all of the serial

port connectors on the board. To solve this

problem, the connectors are often on the ends

of “octopus“ cables that connect to the board.

Another option is to use an external box (which

could be rack mountable) that is connected by a

cable to the multiport serial board.

Flexibility. Most multiport serial board vendors

allow users to begin with a small-range system

with 8 ports, and then expand up to 128 ports,

depending on business growth. In addition,

users have different options for control boards

(PCI or ISA), connection modules (rackmount or

desktop), and COM port interface (RS-232 or

RS-422). Any combination of these options can

be used in one system.

Speed. Many board vendors develop their

own proprietary chip that is integrated with

a dedicated processor, enabling the board to

transmit-and-receive data at up to 921 Kbps

full duplex across all ports simultaneously.

This is two to four times faster than the speed

available using standard UART technology.

Reliability. Along with providing a fast

throughput speed and reduced load on the host

system CPU, the multiport serial board vendor

should also produce boards that are reliable. By

designing boards with a long MTBF (Mean Time

Before Failure), users can be assured that the

multiport serial board will provide many years of

uninterrupted service.

Efﬁciency. Many multiport serial boards

use 128-byte FIFOs, which is larger than the

standard 16550 UART. Experience has shown

that 128 bytes is enough to keep data from

getting backed up at the serial controller level,

while still conserving CPU resources.

Moxa’s MSB Beneﬁts

• You get true ﬂexibility, with the best choice

of bus platform, connector type, COM port

interface, and connection module.

• Choose from various bus interfaces: ISA,

PC/104, PCI, PCI-X, and PCI Express.

• Highest performance that meets all speed-

demanding and data intensive communication

applications.

• Choose from a variety of connection cables

and boxes for RS-232/422/485.

• Drivers for many different operating systems:

DOS, Windows, Linux, UNIX

• 128-byte FIFO and on-chip H/W, S/W ﬂow

control

What Beneﬁts Should Multiport Boards Provide?

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