Posted 20 May 2017 Dear all, I want to use the vb2012 to connect the CP1H. I use the rs232 usb cable to connect the computer and the CP1H, and also use the tool which named "SerialPort" in the vb 2012. The "COM" had been connected, so I think there is something wrong in the command of my program. I have tried many days in this connection, but the cp1h still not give me any feedback. Did someone have write some simple code to connect the CP1H? If that is possible to let me refer, I will very appreciate you. Share this post Link to post Share on other sites