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User’s Guide
NPM800 – NPM800R
NPM800RE
Date : 05/2013
Edition :30/01/2014
Folio : 58
Indice : g
10.2 Resistance of adaptation of the RS 485 connection
In order to adapt the impedance of the RS 485 connection, two resistances of 120 ohms are
necessary. With this intention, NP800 relays are fitted with a resistance of 120 ohms and a
jumper provided for this purpose. To carry out this adaptation, according to the diagram
below, connect the terminal "Rterm" to the terminal "- T/R" of the two end relays of the
connection thanks to the jumper. The jumpers of the other relays of the connection will have
to be removed
