rs232 to usb adapter that supplies 5Volts

[fvnktion]

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?

 

[siongboon]

could you have connect the circuit wrongly?

Perhaps you can upload the schematic for further discussion.


Best Regards,
Siong Boon
MODERATOR - SIGNATURE LINKS ARE NOT ALLOWED

 

[Z-match]

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.