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#1
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Drawing Power from an RS232 Port
I am interested in drawing power from an RS232 port so that it powers an
external circuit, only I am not too sure where to begin. The RS232 port is not on the DTE side, but on the DCE side. I was able to measure -7.59V DC and -25mA on the following PINs using a digital multimeter: RI, DSR, DCD, CTS. Is it possible to draw power from this DCE so that I have +3.3V DC at approximately 140mA for my circuit? Let me know what you guys think. Steph |
#2
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On Mon, 11 Apr 2005 16:09:52 -0400, "S. Ethier"
wrote: I am interested in drawing power from an RS232 port so that it powers an external circuit, only I am not too sure where to begin. The RS232 port is not on the DTE side, but on the DCE side. I was able to measure -7.59V DC and -25mA on the following PINs using a digital multimeter: RI, DSR, DCD, CTS. Is it possible to draw power from this DCE so that I have +3.3V DC at approximately 140mA for my circuit? Let me know what you guys think. Steph There's no way you're going to get 140mA from a serial port, not at 3.3 volts anyway. How about USB instead ? |
#3
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Is it possible to draw power from this DCE so that I have +3.3V DC at approximately 140mA for my circuit? Let me know what you guys think. No, there's not that much power available. Not even from all the signal lines combined. John Musselman |
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