Rs232 Serial Communication; Rs485 Serial Communication; Direct Connection Between Rs485 And Rs232 Without Converter - LAUMAS WTAB-R Installation And User Manual

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Table of Contents

WDESK - WINOX

WTAB

-SUPPLY 12-24 VDC

WDESK

WINOX

WTAB

If the RS485 network exceeds 100 metres in length or baud-rate over 9600 are

used, two terminating resistors are needed at the ends of the network. Two

120 ohm resistors must be connected between the "+" and "–" terminals of the

line, on the terminal strip of the furthest instruments. Should there be different

instruments or converters, refer to the specific manuals to determine whether it is

necessary to connect the above-mentioned resistors.

DIRECT CONNECTION BETWEEN RS485 AND RS232 WITHOUT CONVERTER

Since a two-wire RS485 output may be used directly on the RS-232 input of a PC or remote display,

it is possible to implement instrument connection to an RS-232 port in the following manner:

INSTRUMENT

RS485 –

→

RS485 +

→

This type of connection allows A SINGLE instrument to be used in a ONE WAY

mode.