Com port Voltages

Does anyone know what the voltage is that comes out of the com port? I am setting up a relay to a transformer to operate a flashing light off com port2 on an Asus Motherboard and I need to know what the voltage is.

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  1. Based on a google search, this <A HREF="" target="_new"></A> came up and it and the links in it say it is supposed to handle anything from 3 to 15 volts. In the db25 spec, pin 9 and 10 are supposed to hold a + and - (respectively) 12v signal for testing only.

  2. Thx for this. Why didn't I think of Google!!!
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