diff --git a/acrealio/Node.cpp b/acrealio/Node.cpp
index 5aed57d..8856392 100644
--- a/acrealio/Node.cpp
+++ b/acrealio/Node.cpp
@@ -5,7 +5,7 @@
 //
 // Construct node version
 //
-void Node::setVersion(byte* rType, byte rFlag, byte* rVersion, char* rCode)
+void Node::setVersion(byte* rType, byte rFlag, byte* rVersion, const char* rCode)
 {
     char compileDate[0x10] = __DATE__;
     char compileTime[0x10] = __TIME__;
diff --git a/acrealio/Node.h b/acrealio/Node.h
index 3ea3a89..91f34a2 100644
--- a/acrealio/Node.h
+++ b/acrealio/Node.h
@@ -10,7 +10,7 @@ public:
     virtual void init();
 
     const char* getVersion();
-    void setVersion(byte* rType, byte rFlag, byte* rVersion, char* rCode);
+    void setVersion(byte* rType, byte rFlag, byte* rVersion, const char* rCode);
 
     virtual short processRequest(byte* request, byte* sendBuff);
     virtual void update(); //update things like keypadstate and rfid
diff --git a/acrealio/Reader.cpp b/acrealio/Reader.cpp
index d40186f..51edbdf 100644
--- a/acrealio/Reader.cpp
+++ b/acrealio/Reader.cpp
@@ -11,7 +11,7 @@ Reader::Reader()
 }
 
 //cmd61 is used to specify behaviour on command 0x61
-void Reader::setrCode(char* rCode, byte cmd61_s)
+void Reader::setrCode(const char* rCode, byte cmd61_s)
 {
     byte rType[] = {0x03, 0x00, 0x00, 0x00};
     byte rVersion[] = {0x01, 0x06, 0x00};
diff --git a/acrealio/Reader.h b/acrealio/Reader.h
index b333939..712d018 100644
--- a/acrealio/Reader.h
+++ b/acrealio/Reader.h
@@ -10,7 +10,7 @@ class Reader : public Node
 {
 public:
     Reader(); //contructor
-    void setrCode(char* rCode, byte cmd61 = 0);
+    void setrCode(const char* rCode, byte cmd61 = 0);
     void init();
     void update(); //update things like keypadstate and rfid
 
diff --git a/acrealio/pinoutconfig.h b/acrealio/pinoutconfig.h
index 7b7c272..b9829da 100644
--- a/acrealio/pinoutconfig.h
+++ b/acrealio/pinoutconfig.h
@@ -54,7 +54,7 @@
 
 
 //pins for card reader 1 keypad (colls ABC, rows 1234)
-/* 
+/*
 ### Keypad 3x4 Matrix ###
 
  (7)---(8)---(9)---> ROW 4
@@ -79,7 +79,7 @@ COL C  COL B  COL A
 
 
 //pins for card reader 1 RFID Module
-#define R1_DET 20 
+#define R1_DET 20
 #define R1_SER Serial1
 
 //pins for card reader 2 keypad (colls ABC, rows 1234)
@@ -97,3 +97,4 @@ COL C  COL B  COL A
 #define R2_SER Serial2
 
 #endif
+