46
RS-422/RS-485 COM Port
Applies to:
The RS-422/RS-485 communication port implements a differential serial communication
interface.
The interface supports two wiring methods selectable by software:
n
RS-422 full-duplex using two pair of pins: Rx and Tx,
n
RS-485 half-duplex using only the Tx pair for both Rx and Tx functions.
OPERATING CHARACTERISTICS
Property
Min.
Typ.
Max.
Unit
Full-duplex receiver termination load
impedance
100
Ω
Half-duplex receiver termination load
impedance
100
Ω
Driver differential output voltage
-1.5
+1.5
V
Receiver common-mode voltage range
-7
+12
V
ESD voltage rating
-15
+15
kV
ABSOLUTE MAXIMUM RATINGS
Property
Min.
Typ.
Max.
Unit
DC voltage
-8
+12.5
V
Exceeding the above limits may irreversibly damage the product.
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