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Sets the data available expression for this serial port.

Component Version macOS Windows Linux Server iOS SDK
SerialPort 6.2 ✅ Yes ✅ Yes ❌ No ✅ Yes, on macOS and Windows ❌ No
MBS( "SerialPort.SetDataAvailableEvaluate"; PortReference; Expression )   More


Parameter Description Example
PortReference The reference number of the port. You get this number from SerialPort.Open when you open the port. $port
Expression The expression to evaluate. "Let ( $$Done = 1 ; 1 )"


Returns OK or error.


Sets the data available expression for this serial port.
When new data arrives, this expression is evaluated, so you can call SerialPort.Read functions.
Be aware that script may be called when just a few bytes are in the read buffer. So the data message you wait for may only be available partly. In that case, please read available bytes, check if whole packet/message arrived and if not, store read data for later and wait for next evaluation.

In the expression the text $$ID$$ will be replaced when evaluated with the serial port reference, so you can pass it to other functions if needed.

See also

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This function checks for a license.

Created 29th March 2016, last changed 29th March 2016

SerialPort.SetDTR - SerialPort.SetDataAvailableHandler