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Comunicaciones industriales

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1. Líneas RS-485
 EIA RS-232, Especificaciones de la norma
 EIA RS-422, Especificaciones de la norma
 EIA RS-485, Especificaciones de la norma

EIA RS-485, Especificaciones de la norma

EIA RS-485 Specification Summary.

Parameter Conditions Min Max Units
Driver Output Voltage
Open Circuit
  1.5
-1.5
6
-6
V
V
Driver Output Voltage
Loaded
RLOAD = 54Ω 1.5
-1.5
5
-5
V
V
Driver Output Short-Circuit Current Per output to
+12V or –7V
  ±250 mA
Driver Output Rise Time RLoad = 54Ω
CLoad = 50 pF
  30 % of Bit Width
Driver Common Mode Voltage RLoad = 54Ω -1 3 V
Receiver Sensitivity -7 ≤ Vcm ≤ +12   ±200 mV
Receiver Common-Mode
Voltage Range
  -7 +12 V
Receiver Input Resistance   12K   Ω

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