Moxa Technologies PCI Express Board Manual de usuario descargar pdf (Pagina 5)

Multiport Serial Board Guidebook

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

Multiport Serial Board Guidebook

Extreme Serial Performance Technology

By RTS Moxa’s ADDC

Other Companies’

Auto Solutions

Technology

Software

(Control the RTS to

switch direction)

Hardware

(Auto)

Hardware

(Auto)

System

Complexity*

Low Low High

Reaction time** Slow Fast Fast

Board application Yes Yes Yes

Converter

Application

Yes Yes No

* System complexity refers to the components that make up the product board.

** The time interval that the RS-485 device needs to switch on or off to transmit data. A longer time markes data

collisions more likely. A shorter time markes data collisions less likely.

RS-485 ADDC™

(Automatic Data Direction Control) Design

RS-485 is often used to create a simple network

that includes two or more nodes. If more than

2 nodes transmit at the same time, data from

What Is Direction Control?

Data Direction Control Methods

Limitations:

*The system must determine when to switch

the transmitter on and off.

*Only one node can switch on/off at any given

time.

Traditional Solution:

Use the RTS signal to control the transmitter by

software.

Advanced Method:

ADDC™ (Automatic Data Direction Control).

Beneﬁt:

ADDC™ switches the transmitter on and

off very precisely by hardware, effectively

simplifying the complexity of timing control by

software.

Result:

The Industrial Multiport

Communication Board uses

embedded ADDC™ technology

to sense and control data

direction automatically instead

of using RTS/CTS control,

making the handshaking signal

method obsolete.

different transmissions could collide. For this

reason, RS-485 devices need to control the

direction that data is transmitted.

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