Contrex CX-1200 Manual do Utilizador descarregar pdf (Página 28)

Page 26

Figure 34 CX-1200 Serial Communications Connections

1. Shield only at one end of the cable.

2. If you need to terminate the communication line, then

terminate it at the unit which is the furthest away from

the converter. A 100 ohm, 1/2 Watt resistor will usually

terminate successfully. Refer to EIA Standard

RS-485A, for more information.

RS232 to RS485

Converter

CX-1200 #1

- TXD/RXD

COM

+ TXD/RXD

CX-1200 #2

- TXD/RXD

COM

+ TXD/RXD

TXD/ TXD/

COM RXD RXD

- +

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Contrex CX-1200 Manual do Utilizador Página 28