The CAN bus, originally developed for automobile engine management, is highly reliable. The CAN-Bus connector is available from Erntec .
Among other things, this necessitates a more complicated protocol, which leads to lower data rates and cable lengths.
This can be compensated for in part by larger cable cross sections. Data rates reach 1 Mbit/s. The 9-pin D-Sub connector is standardised as the interface to the device.
In some cases, a version with a shield coupling capacitor is available as an option (cable shield <-> housing D-Sub).