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DS8100A
2
EXTERNAL DEVICE
DS8100A
IN3A
Vext
Ground
V
+ 5V
~
~
+
-
Ground
V
IN4A
+ 5V
~
~
+
-
INREF
Vext
Figure 18 - IN3/IN4 PNP Input Command using External Power
EXTERNAL DEVICE
DS8100A
IN3A
Ground
V
+ 5V
~
~
+
-
EXTERNAL DEVICE
GND
V
IN4A
+ 5V
~
~
+
-
INREF
VS
Ground
Figure 19 - IN3/IN4 NPN Input Command using Scanner Power
Input devices can be supplied by either scanner power (VS and GND) or external power
supplies (Vext).
Electrical isolation between the input command logic and the scanner is maintained when
powering the input devices from an external supply voltage (Vext).
The driving logic of the input signals may be powered, for convenience, with the voltage
supply between pins 9 (VS) and 23 (GND) of the 26-pin I/O connector. In this case, however,
the device is no longer electrically isolated.
The voltage available on the 26-pin I/O connector, is physically the same as used to power
the scanner.
The electrical features of these inputs are:
Maximum voltage 30 V
Maximum current 10 mA
16