Error: Port is opening; some other problems

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I using this package with:

- electron: `^11.1.1`
- escpos: `^3.0.0-alpha.6`
- escpos-serialport: `^3.0.0-alpha.4`

My code:

```js
const escpos = require('escpos');
escpos.SerialPort = require('escpos-serialport');

module.exports = {

printSerial: function(port){
let device = new escpos.SerialPort('COM2', { baudRate: 19200 });
let printer = new escpos.Printer(device);

device.open(function(err){
console.log('== Err ==', err);
printer
.size(1, 1)
.encode('EUC-KR')
.align('CT')
.text('혼밥대왕')
.align('LT')
.tableCustom([
{ text: 'Date:', width: 0.4 },
{ text: '2021-01-04 11:11', width: 0.6 }
])
.tableCustom([
{ text: 'Order ID:', width: 0.4 },
{ text: '050-7866-2406', width: 0.6 }
])
.tableCustom([
{ text: '전화번호:', width: 0.4 },
{ text: '200000000', width: 0.6 }
])
.tableCustom([
{ text: '메모:', width: 0.4 },
{ text: '문앞에 두고 벨을 눌러주세요', width: 0.6 }
])
.newLine()
.text('기사님 이름:')
.text('기사님 번호:')
.newLine()
.tableCustom([
{ text: '내부규', width: 0.33, align: 'LEFT' },
{ text: '내부', width: 0.33, align: 'CENTER' },
{ text: '율과', width: 0.33, align: 'CENTER' }
])
.tableCustom([
{ text: '내부규율과', width: 0.33, align: 'LEFT' },
{ text: '1', width: 0.33, align: 'CENTER' },
{ text: '2,000,000 원', width: 0.33, align: 'CENTER' }
])
.newLine()
.tableCustom([
{ text: '합계', width: 0.6, align: 'LEFT' },
{ text: '2,000,000 원', width: 0.4, align: 'RIGHT' }
])
.tableCustom([
{ text: '배송료(11.2km)', width: 0.6, align: 'LEFT' },
{ text: '2,000 원', width: 0.4, align: 'RIGHT' }
])
.tableCustom([
{ text: '수수료', width: 0.6, align: 'LEFT' },
{ text: '-0 원', width: 0.4, align: 'RIGHT' }
])
.newLine()
.tableCustom([
{ text: '총금액', width: 0.6, align: 'LEFT' },
{ text: '2,000,000 원', width: 0.4, align: 'RIGHT' }
])
.newLine()
.cut();

setTimeout(function(){
printer.close();
}, 1000);
});
}

};
```

When I call `printSerial` method, has error

```
== Err == Error: Port is opening
```

But printer still normal print.

Some other problems

- text has black background,
- It cannot show Korea text.
- How to print dotted line

Thank advance so much for help

Start by reproducing printSerial with the shown device.open call and the COM2 serial printer configuration. Check the reported “Port is opening” error while confirming that printing still works, then separately verify the shown encoding and formatting concerns; done means the port behavior and each reported output problem have a clear, tested resolution.

Written by the indexing model from the issue text.