hello together, we try to implement the can bus protocoll on the controller 89C51C001. we are using the standard frame (11 bit). the standard communication works. but if we are useing rtr messaging we are not able to generate the rtr-response. we have downloaded an example (from keil, but we have the same behavior. we get an rtr-response one times without data. is there somwhere how have also this prolem? thanks for help bye frank