Summary of Problem

Not able to open port with stopbits as 1.5

I am currently building a desktop client using electron, where the COM port receives data correctly for values: baudRate: 2400, dataBits: 7, stopBits: 1.5, parity: 'none'

I found from the node-serialport documentation, stopBits Must be one of these: 1 or 2. But, should 1.5 be supported as well? especially for old & slow hardware.

I assume stopbits 1.5 is a valid value(https://en.wikipedia.org/wiki/Serial_port#Stop_bits)

I am still able to read data, when stopbits 1 is used, but is not as consistent when tested with 1.5(tested with pyserial)

Steps and Code to Reproduce the Issue

port = new SerialPort("COM1", { baudRate: 2400, dataBits: 7, stopBits: 1.5, parity: 'none'   }, function (err) 
    {
        if(err) 
        {
          console.log(err);//Error: Invalid stop bits setting 2
        }
    });

Package name(s) and version(s)

"serialport": "^6.2.2"
"electron": "~2.0.5"

Node version, Operating System and hardware

Node version: v8.11.3; Operating System: Ubuntu 18.04, Processor: Intel i7

Summary of Problem

When I pass stopbits values as 1.5 with the following options, to open serial port, I get the error:

Error: Invalid stop bits setting 2

{ baudRate: "2400", dataBits: "7", stopBits: "1.5", parity: 'none' }

Steps and Code to Reproduce the Issue

Create a nodejs/electron application and open a serialport connection with stopbits value as 1.5.