This project lets you conveniently connect any computer with USB ports directly to a simple, traditional connector the 9-pin RS-232,It converts the electrical signals from a USB<–>serial TLL convertor to the RS-232 standard. So in a nutshell,it converts a USB port into a standard but basic serial port.
nothing is there on the link.
Even the wesite of freecircuits.org is not able to open
Can you post any other link for the theoretical detail of this topic ?
I need to convert a 0-1VDC signal into an RS232/RS485 data for distance commn . thru wires ...
Can I get a simple circuit for this conversion....In case you can design an SNMP for ethernet from a linear 0-1VDC ,,I require that help too.
@vimalkhanna try using transistor(2n2222) as switching to convert your signals to 5v then use MAX232 for serial communication. It works i have tried it for 3v but you can make it for 1v also.