USB to RS232

[david_tp]

Hello here.

I came to post here because i was searching for 3 hours and didn't find my answer. Thank you to every one reading this post.

So my issue : i am using a device with a computer software with serial communication. The problem is that i don't need to send data trough the link but just logical 1 and 0 through some pins. the problem is that the logical 1 to RTS device pin is waiting for 15v and i don't have this voltage from my computer.

Is it possible to have an usb to serial with external power source that gives me this ?? Didn't find any one on google... If yes do you have a link ??

Thank you very much.

 

[ScottMac]

RS232 is usually around 12V ... so even with a power supply, I don't think you'll get there.

You might need to drive a DC-DC Converter, like this:
http://www.mouser.com/ProductDetail...=sGAEpiMZZMtwaiKVUtQsNVSoLQhqwWsL8F2yh2iJV1I=

If you're doing this at a board level, MAXIM has a chip that'll drive the ~5V TTL level signals to nominal RS232 levels using a voltage pump made of capacitors.

Looks like this: http://en.wikipedia.org/wiki/MAX232

Depending on your switching rate, maybe even a low-volts relay or silicon switch to external power might work too.

Some additional details might be helpful ...

 

[david_tp]

Thank you very much for your answer.

I finally achieved to communicate with my device with just 12 volts, the problem was that i had 12 volts out of my computer but not through my cable, i bought a new one and it works like a charm.