Verifone VX510 serial number

enter image description hereI’m sending data through serial port to “Verifone VX520” payment device. It is my first trial to communicate with such devices

SerialObj.Open; string input = "02hPUR.10.99._04.634._010010FFFFF.0808.123456.
.03h"; byte asciiBytes = Encoding.ASCII.GetBytes(input); SerialObj.Write(asciiBytes, 0, asciiBytes.Length);

As per the structure this message should send some amount and appear it on the machine but what I got is only this message “Sending Ack” And when I tried to read acknowledgment I got only this character


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