XON /XOFF (software handshaking Vd hardware handshake)

Hi guys,.

I'm trying to pipe data from the microcontroller to the computer using the max232 for RS-232 connection. I have a male DB9 on the board.i only used 2 pins for this goal. (pin 2 and pin5).

my questions are these:

should 1 - I select any value for XON/XOFF(software handshaking) while I have not used any kind of material transfer protocol? do I have to set their default values of zero?

2. What is the best value for the size of the input buffer if I am trying to acquire an ECG signal through a serial port with 19200 baude rate?

I'm really confused...

Hi David!

When you use tampons, two types of errors can occur related to the size of the buffer.

If the size is too small and we overwrite the data in the buffer, overflow error occurs.

If the size is big enough, and you read a value specified elements (count bytes of VISA depending on reading entry), it can happen, that empty becames buffer and playback VI still wants to read, because the volume of reading data has not reached the given value. It is called precision passing.

I think that in your case, (since you do not handshake) it would be good test certain sizes of different buffer, and of course different bytes count of input values of VISA read function.

You have questions about your original topic on the handshake?

If you have other serial communication, but with another topic, please open a new topic.

Best regards

Tags: NI Software

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