-int8_t cTxString[ 25 ], cRxString[ 25 ]; /* Make sure the stack is large enough to hold these. Turn on stack overflow checking during debug to be sure. */\r
+char cTxString[ 25 ], cRxString[ 25 ]; /* Make sure the stack is large enough to hold these. Turn on stack overflow checking during debug to be sure. */\r