--- titools-0.1/src/common.c.orig	2010-08-28 20:02:29.000000000 -0500
+++ titools-0.1/src/common.c	2011-08-06 00:25:22.077651281 -0500
@@ -555,6 +555,13 @@
     tt_exit();
     exit(EXIT_CABLE_FAILED);
   }
+
+  /*Check if calc is ready */
+  if ((e = ticalcs_calc_isready(calc_handle))) {
+    tt_print_error(e, "calculator not ready");
+    tt_exit();
+    exit(EXIT_CABLE_FAILED);
+  }
 }
 
 void tt_exit()