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Reads a single byte to the serial port.

Component Version macOS Windows Server FileMaker Cloud FileMaker iOS SDK
SerialPort 3.0 Yes Yes Yes No No
MBS( "SerialPort.ReadByte"; PortReference )   More


Parameter Description Example value
PortReference The reference number of the port. You get this number from SerialPort.Open when you open the port. $port


Returns the byte value or an error message.


Reads a single byte to the serial port.
This is very useful for reading control characters which you can't easily put in a text in FileMaker.
Like 13 for a LF (line feed) or 10 for CR (carriage return).
See also SerialPort.AvailableBytes function.


Read one byte:

$value = MBS( "SerialPort.ReadByte"; $port )

See also

Blog Entries

Created 18th August 2014, last changed 6th February 2015

SerialPort.Read   -   SerialPort.ReadHex

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