ALTERNATIVE CONNECTIONS REFERENCE

A

By default, OUT1 is associated with COMPLETE READ event, which activates when the code has been read correctly. In case the reader has been programmed to read several codes within the same reading phase, the event activates when all codes have been read.

OUT2 is associated with NO READ event, which activates when no code has been read. OUT3 - OUT6 are associated with NONE, which means that the output is always in line state.

Isolation between the command logic and the SC6000 is maintained by powering the outputs with an external supply voltage (Vext). For convenience, the outputs can be powered using the VS_OUTPUTS signal on the SC6000 (pin 1). In this case, however, the device is no longer electrically isolated. The VS_OUTPUTS on the Extended I/O connector is short-circuit protected.

The electrical features of these outputs are:

Collector-emitter voltage

30 V Max.

Collector current

130 mA Max.

Saturation voltage (VCE)

1 V at 10 mA Max.

Maximum power dissipation

90 mW at 50°C (Ambient temperature).

The limit requested by the maximum power dissipation is more important than that of the maximum collector current: if one of these outputs is continuously driven, the maximum current must not be more than 40 mA although 130 mA may be reached in pulse conditions.

SC6000

PWO

Vext

USER INTERFACE

 

 

 

 

 

 

V

C

+

 

 

 

-

 

Signal

 

 

 

E Ground

Figure 46 - Open Collector Output Connection with Electrical Isolation

SC6000

PWO

USER INTERFACE

 

VS_OUTPUTS

V

 

+

 

 

-

Signal

 

 

 

GND

 

 

 

Ground

Figure 47 - Open Collector Output Connection Using System Power

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