Advantech RS-485 Manuel d'utilisateur télécharger pdf (Page 38)

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101

3-6 ADAM-5000

ADAM-5000 System

program execution without undue influence on your system. Probabili-

ty of a system crash has thus minimized.

3.3 System Setup

A Single System Setup thru the RS-232 Port

If users would like to use a PC to locally control and monitor a simple

application, the ADAM-5000 system provides up to 64 points or 128

points and front-end wiring through the RS-232 port to the host

computer.

A Distributed I/O Setup thru the RS-485 Network

The RS-485 network provides lower-noise sensor readings as the

systems can be placed much closer to the source. Up to 256

ADAM-5000 systems may be connected to an RS-485

multi-drop network by using the ADAM-4510/4510S RS-485 repeaters,

extending the maximum communication distance to 4,000 ft. The host

computer is connected to the RS-485 network from one of its COM

ports through the ADAM-4520/4522 RS-232/RS-485 converter.

To boost the network's throughput, the ADAM-4510/4510S RS-485

repeaters use a logical RTS signal to manage the repeater's direction.

Only two wires are needed for the RS-485 network: DATA+ and

DATA-. Inexpensive, shielded twisted-pair wiring is employed.

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Advantech RS-485 Manuel d'utilisateur Page 38

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