diff -up wrk/dao/CdrDriver.cc.wrk wrk/dao/CdrDriver.cc

--- wrk/dao/CdrDriver.cc.wrk	2016-02-16 14:06:23.158392345 +0100

+++ wrk/dao/CdrDriver.cc	2016-02-16 14:07:11.654597254 +0100

@@ -495,7 +495,7 @@ unsigned char CdrDriver::syncPattern[12]

   0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0

 };

-char CdrDriver::REMOTE_MSG_SYNC_[4] = { 0xff, 0x00, 0xff, 0x00 };

+unsigned char CdrDriver::REMOTE_MSG_SYNC_[4] = { 0xff, 0x00, 0xff, 0x00 };

 /* Maps a string to the corresponding driver option value 

diff -up wrk/dao/CdrDriver.h.wrk wrk/dao/CdrDriver.h

--- wrk/dao/CdrDriver.h.wrk	2016-02-16 14:21:18.454174199 +0100

+++ wrk/dao/CdrDriver.h	2016-02-16 14:21:42.381275268 +0100

@@ -440,7 +440,7 @@ protected:

   bool fullBurn_;

   static unsigned char syncPattern[12];

-  static char REMOTE_MSG_SYNC_[4];

+  static unsigned char REMOTE_MSG_SYNC_[4];

   static int speed2Mult(int);

   static int mult2Speed(int);