Hi I'm trying to use the rtx can functions. However i get a lot of the "REFERNCE MADE TO UNRESOLVED EXTERNAL" type warnings. My guess is that the RTXICAN.lib file doesn't get properly linked. I have added the file to the keil\c51\LIB directory but that doesn't seem to do much. So basicly I would like to know what I am doing wrong here. Thanks in advance Frank Roberts