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9Factorysettings
Vista SmartTel 45
Appendix A, Interface specifications
Thetablebelowcontainsanoverviewofthemostimportantfeaturesof
interfacesRS-232andRS-485interfaces.
Function RS-232 / V.24 RS-485
Transmissiontype asymmetrical symmetrical
Minimumnumberof
wires
Unidirectional2,
(bidirectional3)
Bidirectional2;
Systemresponsesare
notbeprocessed
Maximumnumberof
receivers(transmitter
andreceiver)
232
Distancebetweenfirst
andlastdevice
15m1,200m
Terminatingresistors no yes
Max.transmissionrate 115,200Bit/s 10MBit/s
Transmitterpermitted
driveroutputvoltage
±25V–7..12V
Driveroutputsignal
withoutload
±156V
Driveroutputsignal
withload
±152V
Driverload 3..7KOhm 54Ohm
Receiverinputvoltage ±15V–7..12V
Sensitivity ±3200mV
Inputresistance 3..7KOhm 12KOhm
Note:Astechnicalpropertiesofserialinterfacecomponentsvary,transmis-
sionrateandlinelengthdataprovidedhereconstitutemaximumlimits.
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