
Appendix B
A-8 MS-820 Industrial Bar Code Scanner User’s Manual
Appendices
Optoisolator Inputs
All discrete inputs can be fully isolated pulses as PNP or NPN circuits.
Inputs include trigger and new master.
Input Examples
Fully Optoisolated
Not Optoisolated
Input (+)
Input (–)
I
load
New master pin input (–) is internally grounded.
Generic Waveform Characteristics
a
Minimum Maximum
V
IN-HIGH
/I
IN-HIGH
4.5 V/3.0mA 28 V/23mA
V
IN-LOW
/I
IN-LOW
0V/0mA 2.0V/1mA
Pulse Width
min
48 µS
a. New Master is activated by applying a voltage of 5
to 28 VDC between New Master (+) and internal
ground.
Isolated Scanner
PNP Source
+V
Signal
V
CC
Input (–)
Input (+)
+V
Signal
V
CC
Input (+)
Input (–)
NPN Source
(trigger only)
Isolated Scanner
New master pin input (–) is internally grounded.
Non-isolated Scanner
Non-isolated Scanner
NPN Source
(trigger only)
PNP Source
Signal
+V
V
CC
Input (–)
Input (+)
Power (+)
Power ground
+V
Signal
V
CC
Power ground
Input (–)
Input (+)
Power (+)
New master pin input (–) is internally grounded.
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