The voltage for USB serial port is 7.5 for my laptop on the DTS pin when high. When low, it is -2 volt using the USB serial adapter.
The voltage for my pc is -9 voltage for low on the built in serial port.
Tomorrow I will ask the shop owner if he has a relay for 7.5 voltage. If not, I will use my transistor switch to provide 5 volt to the relay.
I will bring everything there tomorrow.
The software is no problem for me using visual c# with little modification. I will post my little code when it is done. I just make the serial port write for 7 seconds with the DTS high.
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