Microscan Quadrus EZ, User Manual, Page: 309 / 366

Quadrus EZ Reader User’s Manual
A-5
Appendices
Optoisolator Outputs
Optoisolator circuits can transfer pulses between the reader and peripherals with no direct
connection with the reader’s internal circuitry. However, not every optoisolator configuration
provides complete isolation. The following diagrams show both fully optoisolated and non-
optoisolated circuits. They are only examples and do not represent all the possible wiring
configurations.
Output Circuit Examples
Fully Optoisolated
This circuit is fully optoisolated and the
recommended configuration. It allows
the user to apply 1 to 28 VDC to the cir-
cuit.
Caution: The maximum current that can
pass through the optoisolator is 100mA.
Not Optoisolated, Reader Grounded
In this diagram, power is applied exter-
nally, but the reader’s power ground is
used to complete the circuit. This setup
involves some risk to the optoisolator if
excessive voltages are applied.
Caution: The maximum current that can
pass through the optoisolator is 100mA.
Scanner
Output
Outputs (+)
Outputs (–)
I
Load
Iload=5mA Iload=50 mA Iload =100 mA
VOut-
On
0.5 V 0.5 V 1.0 V
tOn-Typ 5 mS 0.7 mS 0.8 mS
t Off-Typ 5µS 5µS 5µS
Isolated Reader Host
1 to 28 V
Input
Scanner
Output
Power ground
Outputs (+)
Power (+)
Outputs (–)
Non-isolated Reader
Host
1 to 28 V
Input
Scanner
Output
Power ground
Power (+)
Outputs (–)
Outputs (+)