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USC-1 Manual > Board And Connectors > Power, Laser, OptoI/O, RS232 > Opto I/Os > Opto_Outs

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Possibilities of use:

•Opto_Out_0 is predefined and cannot be used for any other purpose. It indicates marking in process (MIP) of the USC-1 and corresponds to the red LED.

•Opto_Out_2 is semi predefined. It is mainly used to control a red pointer.

•The other four Opto_Outs (Opto_Out_1 and Opto_Out_3..5) can be used for various things like ScSetOutput control objects, status outputs, motion controller step and direction, shutter control, etc.

Logic circuit:

Opto_Out_Logic_USC1

Figure 16: Logic circuit diagram of an Opto_Out with an optional pull-up resistor

•In the logic circuit the load is connected between an Opto_Out and Opto_GND.

•Only small output currents can be supplied in the logic circuit, because of the internal pull-up resistor of 4700 Ω. An external pull-up resistor can be used to increase the output current.

Relay circuit:

Opto_Out_Relay

Figure 17: Relay circuit diagram of an Opto_Out

•In the relay circuit the load is connected between  Opto_VCC and an Opto_Out.

•Compared to the logic circuit, a much higher current is possible in the relay circuit.

•Relay circuits cannot be used for multiple inputs with common ground.

Output levels and max. current:

•To use the Opto_Out signals, a suitable power supply has to be connected to Opto_VCC and Opto_GND.

•All Opto_Outs are open-collector outputs with an internal pull-up resistor of 4700 Ω on a common anode. This means that the individual outputs cannot be operated with different voltages.

•The output levels and max. currents of the Opto_Outs depend on the circuit. The values are listed in chapter Electrical Characteristics.

Ext. resistor:

•In logic circuit a suitable external pull-up resistor can be used to decrease signal rising edge. The values are listed in chapter Electrical Characteristics. In most cases a resistor between 470 Ω and 4700 Ω is a good choice.

•Furthermore, the external resistor provides higher currents in the closed logic circuit. But if more power is needed, the relay circuit is recommended.

Polarity:

•By default, the polarity of Opto_Outs is active low.

•All Opto_Outs can be inverted with InvertOptoOut in sc_usc.cfg.

Boot state:

•The boot state of Opto_Outs is inactive.

Check values:

•USC-1 settings

•CCI commands to Get Outputs and Set Outputs