Cable assembly for providing a data acquisition system with data messages passing on a fieldbus of rolling stock

A cable assembly for providing a data acquisition system with data messages passing on a fieldbus of rolling stock, said cable assembly comprising:

• a data listener adapted to listen in on said data messages passing on said fieldbus;
• a data transmitter adapted to transmit said data messages to said data acquisition system;
• and
• an isolation module adapted to electrically isolate said data transmitter from said data listener and from said fieldbus, thereby electrically isolating said data acquisition system from said fieldbus such that said data acquisition system is limited by said isolation module to only listening in on said data messages passing on said fieldbus;
• wherein:
• said fieldbus comprises two data message lines, both data message lines being adapted to carry a redundant differential signal;
• said data listener only listens in on said redundant differential signal only from one of said data message lines;
• and
• said data listener is further adapted to convert said redundant differential signal into a TTL signal and to send said TTL signal to said isolation module which is adapted to transmit said TTL signal to said data transmitter.