Explicit error message for certain hardware error

src/piaxis/Serializer.cpp

@@ -45,8 +45,17 @@ void Serializer::error_handler()
     yat::String err = PIBox_ns::SocketManager::get_instance()->write_read("ERR?\n");
     if (err[0] != '0')
     {
+        yat::String desc = "Hardware error code: " + yat::StringUtil::to_string(err);
+        if (err[0] == '7')
+        {
+            desc += ": Position out of limits";
+        }
+        else if (err[0] == '8')
+        {
+            desc += ": Velocity  out of limits";
+        }
         Tango::Except::throw_exception("HARDWARE_ERROR",
-                        "Hardware error code: " + yat::StringUtil::to_string(err),
+                        desc,
                         "Serializer::error_handler()");
     }
 }