Hello every body
as you know many laptops have not serial port. in windows there are several software as USB to SERIAL converters that can make a virtual com for other softwares that need serial port is there any thing like those software for linux that install and work easily and with no problem for all distributions.

Thanks for any help.

I've used these with no problem. Just plug it in and the kernel knows what to do.

Cheers,

Evo2.

Hi

Just a note of caution from a hardware perspective.
USB to Serial converters sometimes present an interfacing problem on the serial side when taking into account the fact that the device is "simulating" the serial handshake line signals during data communication. This can present timing sequence issues when these devices are used with some serial equipment.

Chris

what do you mean ? you mean that this is on all linux distributions by default? because I want to test it on all distributions (debian ,fedora ,desktop ubuntu ,ubuntu server, CentOS)
How can I test that? I mean to see if it is there or not?
which device file should I use in /dev?how can I use it?
how can I test it through minicom?
how can I change its paramiter like baud rate and so on ?

It is in the mainline kernel, but I don't generally memorize the config files that every distro uses to compile their kernels.

Go ahead and test it on "all distributions" if that's what you want to do.
Use dmesg. Look in /dev/ You can use it in exactly the same way as a normal serial port.
Read the minicom manual if you want to know how to use minicom.

Evo2.

USB serial adapaters will have device IDs beginning with /dev/ttyUSB0.
If your adapter is automatically recognized the modules will load and the device ID will be created so as stated there is nothing special required. However, it depends on the kernel version and adapter chipset (pl2303 and FTDI are probably the most common chipsets). Look at the output of the lsusb command to see the manufacture/chipset information. Some adapters may not be automatically recognized. You can look at the output of the dmesg command to see if your device is recognized.

As stated to test your adapter you can use minicom with a serial loopback plug or connect it to another computer using a NULL modem serial cable. Both computer need to be configured with the same settings i.e. baudrate, parity etc.

1 members found this post helpful.

I reciently brought a USB/Serial from Digikey to access my "beagleboard" as I'm playing around with small/embeded stuff (not very well I might add, it makes my head hurt doing everything from scratch and source, lol) it worked out of the box.

The numbers are BBC01-ND (serial 9pin female, which obviates the need for a null modem/cable.) and AE10289-ND (USB/serial 9pin Male)

It shows up as ttyUSB0 or ttyUSB1 so i need to occasionally change the minicom setting.