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severino

ARDUINO SEVERINO HELP NEEDED!!!!

Buyed a severino some days ago..bt can't figure out how to establish a connection between computer and the severino.i have a USB to serial converter..(comp-->usb--->db9-->RS232-->severino).windows found new hardware,installed the drivers.bt still no LED s ar glowing.And arduino ide cant send data to the chip..do i need any external power supply?plzz plz help