Problem with sending Chr(128) - Chr(255) to a serial port device

Hello all

I am writing a software to communicate with a device via a serial port. I could send a single character of chr(0) - chr(127) and get the response from my device. But when sending chr(128), I got a communication error. It is the same for any character with the ascii code ranging from 128 to 255.

I use the following command:
serial.Output (Chr(Yag))
where Yag is a constant

I also checked the output string from my PPC using a RS232 terminal program. For chr(128) - chr(255), the string "?" was sent out from my PPC. This is not right.

How does Basic4PPC deal with chr(128) - chr(255) sent via a serial port? What is the workaround to send the string with the ascii code from 128 to 255?

Best regards,
Anat

You need to use my http://www.b4x.com/forum/additional-libraries/3368-serialex-improved-serial2-library.html#post18998 which fixes several problems with using Serial2 for binary and non-ASCII communication.

Thank you very much. I replaced the original Serial2.dll by SerialEx.dll, but I still have the same problem with chr(128) - chr(255) when using the "output" method. What is the appropriate method that I should use?

Thanks,
Anat

The standard encoding of SerialEx is ASCII so that it defaults to the same as Serial2. To send strings with characters > 127 you need to set the Encoding property to suit the expectation of whatever you are talking to. There is a list in the Encodings topic of the help.

If if is binary data you are sending then the encoding is irrelevant and you should use Output2 or OutputBytes.

Thank you. The problem is solved using Output2.

Best regards,
Anat