Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. TPDU is an acronym for Transport Protocol Data Unit. TPDU is commonly used in the banking/financial transaction processing industries. Many vendors have used the basic concept and added their own variations. In general, the TPDU is a message encapsulation format where there are several bytes of routing header added to the front of the payload message. A TPDU is 5 bytes in length and consists of 1 bytes message type, 2 bytes destination address, 2 bytes source address. Each byte represents 2 BCD digits. OSI-model: A TPDU is the name for the messages that the protocols in the transport layer of the OSI-model use for communication. Most protocols will implement a CONNECT, SEND and DISCONNECT TPDU.

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