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All Digital I/O signals on DB25 connector are short-circuit proof* and protected against temporary<br />
overvoltage.<br />
* Single I/O only. Total current should be limited to less than 25 mA.<br />
If a Digital IO is used as output to drive a Led, no additional series resistor is needed. The internal protection<br />
resistor will act as a current limiter.<br />
Example:<br />
Output Voltage when "high": 3.3V<br />
Typical forward voltage of a red Led: 1.8V (2.1V typ. for green Led)<br />
Current flow: (3.3V - 1.8V) / 150 Ohm = 10mA<br />
Please note that the screw terminals have different resistor values than the ones of the SUB-D pins!<br />
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