Virtual null modem

[Andy_P]

Can anybody recommend any freeware virtual null modem software?

Or, failing that, how would you begin to program something like this yourself? Sounds like it might be an interesting project.

Thanks!

[mendhak]

Shouldn't be very hard, do you know much socket programming?

[Andy_P]

Do you know much socket programming?
None. :)


But, since you have mentioned using sockets, that is a good place for me to start some research.

[Al42]

What is a virtual null modem? A real null modem is a few pins swapped around. You can't do that virtually. Feeding data from the outside world to the TxD pin will, at best, do nothing and, at worst, burn out some components. Same for all the other pins. Since you can't feed data to the RxD pin from the computer, connecting it to an outside sink won't send any data out.

[Andy_P]

You can't do that virtually.

I beg to differ. ;)

http://www.eltima.com/products/vspdxp/

http://www.aggsoft.com/virtual-null-modem.htm


I'm just looking for a bit of freeware if there is any out there because I'm a cheapskate like that. :)

[Al42]

Those are virtual serial ports. A null modem connects real (as opposed to virtual) serial ports.

Can you write virtual serial ports? Sure - a virtual serial port is just part of a driver. Can you do it in VB? No.

http://www.freedownloadscenter.com/Programming/Misc__Programming_Tools/Virtual_Serial_Port_Kit.html might be what you want.