Beijer-electronics iX T12C EN Instrukcja Użytkownika Pobierz pdf (Strona 31)

Additional Installation Tips

7.6 CableandBusTe rminationRS485

• 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 grounded 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 when the

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

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Beijer-electronics iX T12C EN Instrukcja Użytkownika Strona 31