How to read serial port data without no terminator?

I am trying to send commands to a serial port device and read its response using "writeread". However, the response from the device does not have terminators, which results in a timeout error. How can I let the function return whatever it reads before timeout and ignore the timeout error?

[chrisw23]

You have to know the min count of response bytes at least to

Set the Ports property ReceivedBytesThreshold and register for the DataReceived event. Read the buffer in the callback function. (some example lines, copied from a class)

% obj.thisPort = System.IO.Ports.SerialPort(portName,baudRate)

obj.thisPort.ReceivedBytesThreshold = <n> % event trigger count

addlistener(obj.thisPort,'DataReceived',@obj.DataReceived_Callback)

function DataReceived_Callback(obj,~,event)

bytesToRead = obj.thisPort.BytesToRead; % get real byte count to read

...

end