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SerialPort.SetDataAvailableEvaluate

Sets the data available expression for this serial port.

Component Version macOS Windows Server FileMaker Cloud FileMaker iOS SDK
SerialPort 6.2 Yes Yes No No No

MBS( "SerialPort.SetDataAvailableEvaluate"; PortReference; Expression )

Parameters

Parameter Description Example value
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 )"

Result

Returns OK or error.

Description

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


SerialPort.SetDTR   -   SerialPort.SetDataAvailableHandler

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