Initial Setup and Commissioning > USC Wiring > USC-2

There are two different ways to realize the power supply of your USC-2 card.

We list both methods here, but we always recommend using the second one.

•USB power supply from your PC. For this configuration the Jumper JP1 has to be closed.

•External power supply via the 37-Pin Laser, I/O connector. We always recommend this method since it is more stable and the system is independent from a stable USB-power supply from your PC.

The USC card needs up to three power supplies which are provided via the 37-pin connector of the USC card:

1.USC Main Power

2.USC Opto-coupled outputs and inputs (OPTO_OUT and OPTO_IN)

3.Optionally: Opto-coupled Laserports

Power Supply	USC 37-pin connector		Input [Volts]	Default State
USC Main	EXT_VCC	pin 24	+ 5	USB powered (JP1 closed), but not recommended.
USC Main	GND	pins 14, 15, 25	+ 5	USB powered (JP1 closed), but not recommended.
USC OPTO_OUT	OPTO_VCC	pin 5	+ 5 .. + 24[a]	Not powered.
USC OPTO_OUT	OPTO_GND	pin 6	+ 5 .. + 24[a]	Not powered.
USC Laser-Ports	EXT_LASER_VCC	pin 11	+ 5	Powered via USC main.
USC Laser-Ports	EXT_LASER_GND	pin 30	+ 5	Powered via USC main.

Table 5: USC Power Connection

[a]: Usually the laser requires 5V signals. If needed the Opto_VCC can be supported with up to 24V.

When you power up the USC-2 card, the green LED will flash constantly and then stay steady. The blue LED is on as well.

After finishing the power supply you can continue with the wiring of the laser connection.