diff --git a/io/serialport/25-serial.js b/io/serialport/25-serial.js
index c2128c5b..07b3fd8d 100644
--- a/io/serialport/25-serial.js
+++ b/io/serialport/25-serial.js
@@ -49,9 +49,9 @@ module.exports = function(RED) {
                         else {
                             payload = payload.toString();
                         }
-                        payload += node.addCh;
+                        if (node.out === "char") { payload += node.addCh; }
                     }
-                    else if (node.addCh !== "") {
+                    else if ((node.addCh !== "") && (node.out === "char")) {
                         payload = Buffer.concat([payload,new Buffer(node.addCh)]);
                     }
                     node.port.write(payload,function(err,res) {
diff --git a/io/serialport/package.json b/io/serialport/package.json
index 8e8eafdf..09c8b413 100644
--- a/io/serialport/package.json
+++ b/io/serialport/package.json
@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-node-serialport",
-    "version"       : "0.6.2",
+    "version"       : "0.6.3",
     "description"   : "Node-RED nodes to talk to serial ports",
     "dependencies"  : {
         "serialport"   : "^6.0.4"