serial usb programming

[amadeus84]

Some time ago I wrote a program that opens the serial port (/dev/ttyS0) on a PC and controls a PTZ camera. Now I want to use that with the Pi, but of course, the Pi has no serial port (RS232). Given the right RS232 to usb converter (perhaps this one
http://www.amazon.com/Manhattan-Serial- ... =pd_cp_e_2), what's involved in porting the code from the serial port to the usb port?

An alternative is to use a TTL to RS232 converter and talk to the UART port. But since I already have the usb to RS322
cable, I'd like to try the usb first.

Any examples or tutorials?

Thanks!

[PeterO]

It should be as simple as replacing "/dev/ttyS0" with "/dev/ttyUSB0"

PeterO

[ame]

There is also an on-board serial port at /dev/ttyAMA0

You may need a level-shifter (it operates at 3.3V) and you may need to reconfigure it so that it is not used by the kernel:
http://elinux.org/RPi_Serial_Connection ... erial_port

[amadeus84]

It should be as simple as replacing "/dev/ttyS0" with "/dev/ttyUSB0"

PeterO

That's what I was hoping, but I'm trying this on my pc first, and I don't have /dev/ttyUSB0. I do have /dev/ttyS[0-3].

[AndrewS]

If you plug your USB-serial cable into your (Linux, right?) PC, it should get automatically recognised and create a /dev/ttyUSB0 device for you.

If not you'll have to look at the 'dmesg' output to work out why the driver didn't get automatically loaded...