Beijer-electronics iX T10A EN Manual de usuario descargar pdf (Pagina 27)

Additional Installation Tips

6.7 CableandBusTerminationRS485

• If maximum transfer distan ce and maximum transfer speed is needed,

shielded and twisted pair cable should be used. The mutual capacitance

may not exceed 52.5 pF/m, and the cable area should be at least 0.25 mm

(AWG 24).

• 0 V, the reference voltage for communication should be included in

the cabling. With two-way communication use two pairs; one pair for

communication and one pair for 0 V.

• The shield mus t be grounded at one end. The other end is usually grounded,

but with longer distances or when there is a difference in the ground potential,

theshieldshouldbeconnectedtothegroundvia0.1μF/250Vplastic

capacitor to prevent ground current in the braided shield. A number of

manufacturers recommend that the shield be g rounded at each node. Various

manufacturers have different systems for bus termination.

Depending on the recipients’ design, the bus wires may be on the same level or

require pull-up or pull-down to ensure that no faulty signals are detected w hen the

bus is in resting mode (all transmitters are disconnected).

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Beijer-electronics iX T10A EN Manual de usuario Pagina 27