Hi anyone knows what does it mean, when using an isolated USB2RS232 port, receiving exactly the same message that I sent? I'm interrogating a custom frequency converter, with its own protocol, and the device responds with the same message I sent. Basic serial settings, read bytes at port and so on. The company who build it is sending me their rs232 port converter, so to make sure why they are successful and me not. Thanks

It was the serial interface the problem. The one I got from the inverter supplier is a custom made RS232 device, working on 0-5V levels.

Instrument Control (GPIB, Serial, VISA, IVI)

rs232 receive same message sent

Solved!

I recieve data frame from rs232 (USB to COM) but how to pass the byte that we have already read to continue the data flow... It is similar to "FLAG in C language" !!!

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Instrument Control (GPIB, Serial, VISA, IVI)

rs232 receive same message sent

Re: rs232 receive same message sent