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fvnktion
Joined: 20 Jan 2006
Posts: 10
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 26 Oct 2009 17:48 rs232 to usb adapter that supplies 5Volts |
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Does anyone know of an rs232 to usb adapter that supplies a small usable supply voltage on one of the DB9 pins? This would be an optimal fix for what I am trying to do.
Alternatively I think this my work??? What do you think?
I want to be able to power an RS232 tranceiver with 2mA at a minimum of 2.5 Volts. I have tested an existing adapter that when enabled has 5.4 volts on pin 7 (Request to send) and 4 ( Data terminal Ready).
I put a load of 100 ohms on the lines and they are loaded down to 2.6 volts on the 2 given lines. Based on the calcluation the lines are supplying 2.6 volts/100 ohms = 26 mA. It appears that the terminal would still able to run without using the Hardware control pins, especially given my load of only 2mA needed should leave a much high voltage on the control pins.
Any suggestions?
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siongboon
Joined: 24 Jan 2006
Posts: 288
Helped: 25
Location: Singapore
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27 Oct 2009 15:17 Re: rs232 to usb adapter that supplies 5Volts |
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could you have connect the circuit wrongly?
Perhaps you can upload the schematic for further discussion.
Best Regards,
Siong Boon
www.siongboon.com
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Z-match
Joined: 04 Nov 2009
Posts: 3
Location: indonesia
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04 Nov 2009 6:27 rs232 to usb adapter that supplies 5Volts |
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yes, how it can be..??
they call Parasitic power line. via DIODE 1n4148 its can doing. hook to line control rs-232. is'n it..?
ugh.. converter rs232 to USB..?? power consumption..?
may be u can using FTDI IC FT232 like that... pls gooling.
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Jammers
Joined: 18 Sep 2009
Posts: 6
Location: India
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05 Nov 2009 7:50 Re: rs232 to usb adapter that supplies 5Volts |
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Try using SMPS based Adaptors........
http://www.shoghi.co.in/Power_Products.html
May this help u out............
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