diff -ur QtDMM-0.8.12.orig/src/dmm.cpp QtDMM-0.8.12/src/dmm.cpp
--- QtDMM-0.8.12.orig/src/dmm.cpp	2007-12-25 14:26:19.000000000 +0300
+++ QtDMM-0.8.12/src/dmm.cpp	2009-06-10 23:12:09.000000000 +0400
@@ -418,7 +418,7 @@
   {
     val += re->string()[i];
   }
-  if (re->string()[4]&0x0f != 0x0a)
+  if ((re->string()[4] & 0x0f) != 0x0a)
   {
     val += re->string()[4];
   }
@@ -721,10 +721,10 @@
   m_error = tr( "Connected" ) + " (" + m_name + " @ " + m_device + ")";
 }
 
-char *DMM::RS22812Digit( int byte )
+const char *DMM::RS22812Digit( int byte )
 {
-  int     digit[10] = { 0xd7, 0x50, 0xb5, 0xf1, 0x72, 0xe3, 0xe7, 0x51, 0xf7, 0xf3 };
-  char *c_digit[10] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
+  int           digit[10] = { 0xd7, 0x50, 0xb5, 0xf1, 0x72, 0xe3, 0xe7, 0x51, 0xf7, 0xf3 };
+  const char *c_digit[10] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
      
   byte &= 0x0f7;
      
@@ -1545,10 +1545,10 @@
   m_error = tr( "Connected" ) + " (" + m_name + " @ " + m_device + ")";
 }
 
-char *DMM::vc820Digit( int byte )
+const char *DMM::vc820Digit( int byte )
 {
-  int     digit[10] = { 0x7d, 0x05, 0x5b, 0x1f, 0x27, 0x3e, 0x7e, 0x15, 0x7f, 0x3f };
-  char *c_digit[10] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
+  int           digit[10] = { 0x7d, 0x05, 0x5b, 0x1f, 0x27, 0x3e, 0x7e, 0x15, 0x7f, 0x3f };
+  const char *c_digit[10] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
   
   byte &= 0x7f;
   
diff -ur QtDMM-0.8.12.orig/src/dmm.h QtDMM-0.8.12/src/dmm.h
--- QtDMM-0.8.12.orig/src/dmm.h	2007-12-25 14:26:43.000000000 +0300
+++ QtDMM-0.8.12/src/dmm.h	2009-06-10 23:10:59.000000000 +0400
@@ -82,8 +82,8 @@
   void readVC940Continuous( ReadEvent * );
   void readQM1537Continuous( ReadEvent * );
   void readRS22812Continuous( ReadEvent * );
-  char *vc820Digit( int );
-  char *RS22812Digit( int );
+  const char *vc820Digit( int );
+  const char *RS22812Digit( int );
   
 };
 
diff -ur QtDMM-0.8.12.orig/src/dmmprefs.h QtDMM-0.8.12/src/dmmprefs.h
--- QtDMM-0.8.12.orig/src/dmmprefs.h	2007-11-24 23:52:07.000000000 +0300
+++ QtDMM-0.8.12/src/dmmprefs.h	2009-06-10 23:13:34.000000000 +0400
@@ -26,7 +26,7 @@
 
 struct DMMInfo
 {
-  char *name;
+  const char *name;
   int   baud;
   int   protocol;
   int   bits;