diff --git a/PrinterDev.js b/PrinterDev.js
index 8d1b959..cd6e025 100644
--- a/PrinterDev.js
+++ b/PrinterDev.js
@@ -51,9 +51,21 @@ class PrinterDevice {
       .align('ct')
       .size(1, 1)
     for (let i in strs) {
-      printer.text(strs[i], 'big5')
+      this._printer.text(strs[i], 'big5')
+    }
+    this._printer.cut(true, 8)
+  }
+
+  async close() {
+    if (!this._device) return
+    if (this._type == 'serial') {
+      let self = this
+      await new Promise((resolve, reject) => {
+        self._device.close(() => {
+          resolve(1)
+        })
+      })
     }
-    printer.cut(true, 8)
   }
 
   get isOpen() {
diff --git a/gdata-characteristic.js b/gdata-characteristic.js
index 38473ab..2fcd438 100644
--- a/gdata-characteristic.js
+++ b/gdata-characteristic.js
@@ -3,6 +3,7 @@ const config = require('./config.json')
 const localEvent = require('./localEvent')
 
 var tmp = []
+var idx = 0
 
 const notifyDesciptor = new bleno.Descriptor({
   uuid: '8888',
@@ -27,7 +28,7 @@ class DataCharacteristic extends bleno.Characteristic {
 
     if (data.length == 1 && data[0] == 0x00) {
       tmp = []
-      console.log(data[0])
+      idx = 0
     } else if (data.length == 1 && data[0] == 0xff) {
       console.log(Buffer.from(tmp).toString())
       localEvent.emit('print', Buffer.from(tmp).toString())