This package is an implementation of serial bus (like RS-485).
The core feature is multiplexing of request/response pairs with the assumption that the responses could not be distinguished between themselves (for example, using responder's leaf identifiers like it's done in the ModBus protocol).
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Absolute encoders in OpenVMP
The OpenVMP platform uses this module to multiplex requests to multiple AMT-21* encoders sitting on the same RS-485 line.