Microscan MS-9 User Manual page 185

Optoisolator Outputs
Optoisolator circuits can transfer pulses between the scanner and peripherals with no
direct connection with the scanner'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 repre-
sent all the possible wiring configurations.
I =5 mA I
load
a
V 0.7 V
Out-On
t 15 µS
On-Typ
t 1000 µS
Off-Typ
a. Voltage drop across output when activated.
Output Circuit Examples
Fully Optoisolated
This circuit is fully optoisolated and is
the recommended configuration. It
allows the user to apply 1 to 28 VDC to
the circuit.
Caution: The maximum current that
can pass through the optoisolator is
100 mA.
Not Optoisolated, Scanner
Grounded
In this diagram, power is applied exter-
nally, but the scanner'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
100 mA.
=50 mA I =100 mA
load load
0.9 V 1.0 V
20 µS 30 µS
150 µS 75 µS
Non-isolated Scanner
Scanner
Output
Isolated Scanner
Power (+)
Scanner Outputs (+)
Output
Outputs (–)
Power ground
Power (+)
Scanner Outputs (+)
Output
Outputs (–)
Power ground
MS-9 Scanner User's Manual
Appendices
Outputs (+)
I
Load
Outputs (–)
Host
1 to 28 V
Input
Host
1 to 28 V
Input
A-7