Microscan MS-2 Instrukcja Użytkownika Pobierz pdf (Strona 110)

A-12 MS-2 CCD Reader User’s Manual

Using an External Trigger

Appendix G — Using an External Trigger

Two types of inputs are used on Microscan readers. 5 volt devices have NPN trigger

inputs. 10-28 volt devices have optoisolated inputs and outputs.

5 Volt Devices

To trigger a 5 volt device, the input has to be pulled down to “signal ground” (NPN). This

can be done by relays or by a transistor-sourced signal. If a 5 volt device is used in combination

with an IC-332, it must be connected as a 10-28 volt device.

10-28 Volt Devices

To trigger a 10-28 volt device, a small amount of current needs to flow from “Trigger +” to

“Trigger –”. If a PNP source is used, “Trigger –” must be connected to “signal ground”. If an

NPN source is used, “Trigger +” must be connected to the supply voltage.

Reader Sensor

Reader

Sensor

Reader

Sensor

Reader Sensor

PNP NPN

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