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1592028150 XWEB300D_500_500D stp GB r2.1 2012.06.22.doc
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Wrong connection
Always keep the serial cable away from power cables.
Always keep the serial cable away from Electro-magnetic or frequency sources.
Do not connect shield to ground.
Do not connect the “Gnd (ground)” terminal.
Remember to draw a map of the line. This will help you to find errors if
something is wrong.
The instrument with RS485 have “+” and “-“ terminals, respect the polarity.
To keep the line balanced it is necessary a 100 Ohm resistor at the end of the
line (you can use the RS 485+ and RS 485- terminals of the last instrument
connected).