Datalogic Dragon Reference Manual

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Datalogic Dragon Reference Manual Manual pdf 18 page image

DRAGON™62The two RS485 connectors are identical in every respect so that the point-to-pointcables can be chained together without limitations concerning the bus wiring.Obviously cable length is to be kept to a minimum as with all bus systems.2.6.2 Network CablingThe Multidrop line is made using RJ45 connectors and a cable having the followingspecifications:• twisted pair AWG 24 wires• 120 Ω impedance• maximum network cable length 1200 metersPin Function Multidrop Cables1 RS485 +2 RS485 -3 N.C.4 VDC –5 VDC –6 N.C.7 VDC +8 VDC +52RJ4552RJ451 1VDC-RS485-RS485+Twisted Pair - RS485 bus852RJ45852RJ451 1Twisted Pair - RS485 busTwisted Pair - Power supplyVDC+VDC-RS485RS485When wiring the multidrop cables, note the following:Pin 8 (or 7) can be connected only if the power has to be propagated from a cradle to aSTARGATE™ base station or STAR-Box™ converter via the cable.Pins 5 (or 4) should always be connected as reference ground.To avoid excessive voltage drop, it is recommended to not propagate power betweenOM-DRAGON™ cradles when used as battery chargers but to supply each cradleDataonlyDataandPowerSupplyPin 1