Eaton i-on1000EX Installation Manual

Also see for i-on1000EX: Quick user guide

i-on1000EX Before You BeginPage 11For a daisy-chain configuration, the total cablelength should not exceed 1,000m.Note that if there are only two arms in a starconfiguration, this is equivalent to a daisy-chainconfiguration.Bus TerminationThe i-on1000EX bus uses the RS485 interface.Because of this, the ends of the line in someconfigurations may be terminated to improveperformance in electrically noisy environments orwhere there are long cable runs. The control unithas a termination link for each bus (see Figure 3).Expanders and keypads have a termination linkon their PCBs (see Figures 7, 11 and 13 for thekeypads). Fitting a jumper to the pins adds atermination to the cable.In a daisy-chain configuration, fit the terminationjumpers in the devices at each end of the chain(see Figure 17).In a star configuration, terminate at the twodevices on the ends of the longest cables (seeFigure 17).Voltage DropIn order for the system to work correctly, thevoltage at each device must NOT drop below10.5V even when running on the standby battery.Eaton’s Security Business recommend that thevoltage at each device should stay above 12V.Standard 7/0.2 alarm cable has a resistance of 8Ohms per 100m per core. The voltage drop iscalculated using the following formula: V Drop =Current drawn x cable length x 0.08 x 2.Table 1 shows the voltage drop against thecurrent drawn and cable length.The shaded area shows where the voltage dropwould cause the bus voltage to fall from 13.8V tobelow 12.0V when using a single core.Figure 17 Bus Termination