=== Requirements ===
- PySerial

=== Device Driver ===
GPD-3303S uses a USB to serial converter chip provided by FTDI. If you have not
installed its device driver, please download and install it on your machine
first.

=== Example ===
>>> import gpd3303s
>>> gpd = gpd3303s.GPD3303S()
>>> gpd.open('/dev/ttyUSB0') # Open the device
>>> gpd.setVoltage(1, 1.234) # Set the voltage of channel 1 to 1.234 (V)
>>> gpd.enableOutput(True) # Output ON
>>> v = gpd.getVoltageOutput(1) # read the actual voltage