In a semiconductor module according to certain aspects the invention, a U-terminal and an M-terminal overlap each other in a manner to reduce inductance and to further to reduce the size of snubber capacitor. This makes it possible to improve a transmission efficiency of the collision load between the connecting member and the front side member. When displaying connections, a slice value and granularity may be adjusted to allow for effective viewing of connections having high data rates. Each stop device receives the initial start message and any subsequent start messages, using the elapsed time in the start message to synchronize a local timer.