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Comunicaciones industriales

1. RS-485 lines
 EIA RS-232, Standard Specifications
 EIA RS-422 standard specifications
 EIA RS-485, Standard Specifications

EIA RS-485, Standard Specifications

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
+12 V 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
Common-Mode Receiver
Voltage Range
-7 +12 V
Receiver Input Resistance 12K Ω

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