Eliwell Memory 1000 - RS-232 Serial Connections; Analogue Inputs-Probes; RS485 Connection

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9.1.2 Analogue inputs-Probes
Temperature probes
The temperature probes have no characteristic insertion polarity and can be
extendedusingstandardbipolarcable(notethatextendingcablescanaffectthe
performanceofthedeviceintermsofelectromagneticcompatibility:takegreat
carewiththewiring).

Important!
Pressure probes Humidity probes
Pressureprobeshaveaspecificinsertionpolaritywhichmustbeobserved.
Signal cables (temperature/pressure/humidity probes, digital inputs) must be
cabledseparatelyfromhighvoltagecables.
Eliwell supplied cables are recommended. Contact Eliwell sales department for
itemavailability.
9.1.3 RS485 connection

RS485
Use a shielded and “twisted” , twin-conductor 0.5mm2 section cable, plus
braiding (i.e. Belden cable model 8762 with PVC sleeve, 2 conductors plus
braiding,20AWG,nominalcapacitybetween89pFconductors,nominalcapacity
betweenaconductorand161pFshielding).
SeestandardsrelatingtoEN50174datatransmissionsystemsforindicationson
howtolaycables.
Makesuredatatransmissioncircuitsarewellseparatedfrompowerlines.
ARS-485networkupto1200minlengthfeaturingamaximumof15devicescan
beconnectedstraighttothedevice.
Thislengthcanbeextendedandthenumberofdevicesforeachchannelincreased
usingappropriaterepeatermodules.
See the “Installation of the RS- 485 network” manual for more detailed
information.
Attachthe120 (Ohm)1/4W resistorsbetween the “+” and “-“terminals on the
interfaceandlastdeviceineachbranchofthenetwork.
9.1.4 RS-232 serial connections
Use the RS232 DB9-DB9 nullmodem cable provided or equivalent cable to
connecttoaPC.