   try {
           xhReq.send();
           xhReq.onload = function () {
-            el('state').innerText = cmd + ': ' + this.responseText;
+            el('state').innerText = this.responseText;
           }
   } catch(ex) {
     el('state').innerText = 'send error';

<button class="button30" onclick="l('SE');">E-Stop!</button>
<hr/>

<button onclick="l('TO', elv('x'), elv('y'));">Move To</button>
X:<input style="width: 40px" type="number" id="x" value="0"/>
Y:<input style="width: 40px" type="number" id="y" value="0"/>
<hr />



    padding: 5px;
}
.content {
    padding-top: 15px;
    text-align: center;
}
.button30 {
