Purpose and intention of this document is to determine and standardise a communication protocol between network layers in an automated material flow system within warehouses. Each layer in the stack of material flow communication partners may use different hardware and software components where the protocol is implemented for, that make a protocol definition even more essential to ensure a proper handshake between layers and communication endpoints. The communication protocol defined in this document aimed to be used between layers according to the Transport Management System (TMS). All affected layers and communication partners are described in detail in chapter 3.