Serial communication on pins TX/RX uses TTL logic levels (5V or 3.3V depending on the board). GitHub Gist: instantly share code, notes, and snippets. 0 Comments Excel Com port communication - VBA Visual Basic for Applications (Microsoft)Can anyone help with communicating to a COM port through Excel (on a machine that does not also have Visual Basic installed)? I've tried downloading MSCOMM -Excel recognizes the reference to MSComm. It's some kind of a Modbus-like approach of communication but more flexible and customizable. An Arduino-framework based library for the simplified but structured communication over serial lines. The correct way to do it is: ser = serial.Serial(0, 19200, timeout=1,parity=serial.PARITYODD, rtscts=0) ser.write(chr(0x02)) #ASCII STX is. You are passing an integer so the result is unknown, maybe is casting it to str so you are sending the char '2'. The write function in serial class accepts bytes or strings.
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