CAN bus and pneumatic tube: what they have in common

1. Step 1. CAN bus — is used in — Engine control unit. Linking the units.
2. Step 2. Engine control unit — is used in — Anti-lock braking system (ABS). The ABS unit.
3. Step 3. Anti-lock braking system (ABS) — evolved from — Air brake. Anti-skid systems first appeared in aviation and on railways.
4. Step 4. Air brake — uses — Compressed air. The brake is controlled by air pressure in the train pipe.
5. Step 5. Compressed air — is used in — Pneumatic tube. Air pressure.

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