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Writes a single byte to the serial port.

Component Version macOS Windows Linux Server iOS SDK
SerialPort 3.0 ✅ Yes ✅ Yes ❌ No ✅ Yes, on macOS and Windows ❌ No
MBS( "SerialPort.WriteByte"; PortReference; Value )   More


Parameter Description Example
PortReference The reference number of the port. You get this number from SerialPort.Open when you open the port. $port
Value The byte value to send. Range from 0 to 255. 13


Returns the number of bytes written.


Writes a single byte to the serial port.
This is very useful for sending 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).


Write a character:

MBS( "SerialPort.WriteByte"; $port; 65 )

See also

Example Databases

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This function checks for a license.

Created 18th August 2014, last changed 18th August 2014

SerialPort.Write - SerialPort.WriteHex