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USC-1 Manual > Board And Connectors > Power, Laser, OptoI/O, RS232 > Power > Bus Powered

Bus Powered
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The USB specification allows to draw 500 mA from the USB power line. The power consumption of the USC-1 depends on several conditions and can exceed significantly this upper limit. Although the most USB host systems allow to draw much more power over the USB line, this mode should be only used for test and evaluation purpose. Next to the allowed power rate only shorter USB cables should be taken in account since due to the cable resistance the available voltage on the board itself could go below internal allowed values.

warning

Please note that we recommend to always power the USC card externally and to dismount the jumper JP4 next to the USB connector.

BUS powering is only valid for testing without scanner or laser connected.

As soon as laser and scanner are connected to the USC card, we cannot guarantee full functionality when USB powered.