The CAN Master Line is a line of "intelligent" CAN modules that can be operated as single modules or combined to a complex system with a large number of CAN nodes. They allow the check of network management functions or the residual CAN bus simulation for automotive tests. The CAN Master Line modules can also be used for the test of gateway functions at control instruments that are connected to several CAN networks in the vehicle as well as for the parallel test of UUTs within run-in, endurance or reliablity checks