首先用 EpsonNet Config 程式，將印表機的 ip 設定好。

然後從瀏覽器登入 http://192.168.1.x/ 帳密可能是 epson/epson 或 空白/SN 或 epson/SN ~
到 Configuration/Network/ePOS-Print 頁籤
Enable ePOS-Print 功能，然後 Send

函數庫可到原廠下載
https://download-center.epson.com/softwares/?device_id=TM-T70II&os=IOS&language=zh-TW®ion=TW

請下載 Epson ePOS SDK for JavaScript
解壓縮之後，請抓出 epos-2.27.0.js

製作一個 html 程式類似下面這樣。

<!doctype html>
<html>
  <head>
    <meta charset="utf-8">
    <title>epson test</title>
    <script src="epos-2.27.0.js"></script>
  </head>
  <body>
    
    <div>
      <img id="imgLotusFlower" src="test.jpg">
      <canvas id="myCanvas" style="display: none;"></canvas>
    </div>
    
    <div>
      <button onclick="printTest()">測試列印</button>
    </div>
    
    <div id="divResult"></div>
    
    <script>

var oCanvas=null, oCtx=null;

window.addEventListener(
  "load",
  async function()
  {
    var oImg = document.getElementById("imgLotusFlower");
    oCanvas=document.getElementById("myCanvas");
    oCanvas.setAttribute("width", 400);
    oCanvas.setAttribute("height", 400);
    oCtx=oCanvas.getContext("2d");
    oCtx.drawImage(oImg, 0, 0, oImg.width, oImg.height, 0, 0, 400, 400);
  }
);

function printTest() 
{
  let oBuilder=new epson.ePOSBuilder();
  
  oBuilder.addTextLang("zh-tw");
  
  oBuilder.addTextSize(2, 2); // 寬兩倍，高兩倍
  oBuilder.addText("test00013\n");
  
  oBuilder.addTextAlign(oBuilder.ALIGN_RIGHT);
  oBuilder.addText("電子發票證明聯\n");
  
  oBuilder.addTextAlign(oBuilder.ALIGN_CENTER);
  oBuilder.addText("置中\n");
  
  oBuilder.addTextAlign(oBuilder.ALIGN_LEFT);
  oBuilder.addText("電子發票證明聯補印\n");
  
  oBuilder.addTextSize(1, 2); // 寬一倍，高兩倍
  oBuilder.addText("盛雲藥品股份有限公司\n");
  
  oBuilder.addTextSize(1, 1);
  
  oBuilder.addText("一");
  oBuilder.addTextPosition(100); // 100 dots
  oBuilder.addText("有移動嗎？\n");
  
  oBuilder.addText("項二耶");
  oBuilder.addTextPosition(100); // 100 dots
  oBuilder.addText("有對齊嗎\n");
  
  oBuilder.addBarcode("4711234567890",oBuilder.BARCODE_EAN13,oBuilder.HRI_BELOW,oBuilder.FONT_A,2,60);
  oBuilder.addText("\n");
  
  oBuilder.addBarcode("123456789012",oBuilder.BARCODE_CODE39,oBuilder.HRI_NONE,oBuilder.FONT_A,2,60); // HRI_BELOW / HRI_NONE
  oBuilder.addText("\n");
  
  oBuilder.addSymbol("https://www.macro.com.tw",oBuilder.SYMBOL_QRCODE_MODEL_2,oBuilder.LEVEL_M,6,0);
  oBuilder.addText("\n");
  
  oBuilder.addCut(oBuilder.CUT_FEED);
  
  oBuilder.addImage(oCtx, 0, 0, 400, 400); // 400 dots x 400 dots
  
  oBuilder.addCut(oBuilder.CUT_FEED); // 切紙
  
  let strRequest=oBuilder.toString();
  
  var oEPOS=new epson.ePOSPrint("http://192.168.1.71/cgi-bin/epos/service.cgi?devid=local_printer&timeout=10000");
  
  oEPOS.onreceive=function(oResult) 
  {
    if (oResult.success) { document.getElementById("divResult").innerHTML="列印成功"; }
    else                 { document.getElementById("divResult").innerHTML="列印失敗"; }
  };
  
  oEPOS.send(strRequest);
}
    </script>
    
  </body>
</html>