Advantech Advantech Modem ADAM-4550 Uživatelský manuál stáhnout pdf (Strana 3)

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Note: All specifications are subject to change without notice

ADAM 4000 Series

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ADAM 4000 Series

RS-232/RS-485 Conversion

If no RS-485 interface is available on the

host computer, you can use the

ADAM-4520 RS-232/RS-485 converter

to change standard RS-232 port signals

into fully isolated RS-485 signals. The

ADAM converter and repeater modules

automatically control the RS-485 bus

direction without external handshaking

signals from the host. Host software

written for half-duplex RS-232 may be

used without modification. RS-485 bus

control is completely transparent to the

user. The ADAM converter also protects

the host computer from potentially

destructive voltages which may develop

on the RS-485 data lines.

Universal Protocol

All ADAM commands are issued in

printable ASCII-based form. This allows

you to write ADAM applications in any

high-level language that supports ASCII

string functions, such as C, Pascal or

BASIC. RS-232 and ASCII support

means that you can use virtually any

computer to manage your ADAM

network.

RS-232/RS-485 Networks

RS-485 Multi-Drop

Networking

ADAM modules use the EIA RS-485

communication protocol, the industry's

most widely used bidirectional, balanced

transmission line standard. EIA RS-485

was specifically developed for industrial

applications. It lets ADAM modules

transmit and receive data at high rates over

long distances. All modules use optical

isolators to prevent ground-loop problems

and limit the chance of damage due to

power surges.

Two-wire Communication

ADAM modules use a single twisted pair

of wires to transmit and receive data.

Special circuitry suppresses noise

picked up from communication lines, en-

suring clean and reliable communication.

ADAM’s two-wire RS-485 technology

keeps the number of cables, connectors

and communication conditioners (such

as repeaters and filters) to a minimum,

simplifying installation and reducing

overall network costs.

Surge Protection

ADAM modules offer internal surge

protection on their data lines. Internal high

speed transient suppressors on each data

line protect the modules from damaging

voltages or spikes.

Network Expansion

Each ADAM-4510 repeater lets you add

32 ADAM modules to the network or

extend the network by another 4000 feet

(1.2 km). You can connect up to 256

ADAM modules to a single RS-485

network.

Up to 256 ADAM-4000 modules with repeaters can be connected to a

single RS-485 network

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