CCTALK PROTOCOL PDF

Help Wikipedia improve by adding precise citations! September Learn how and when to remove this template message ccTalk pronounced see-see-talk is a serial protocol in widespread use throughout the money transaction and point-of-sale industry. Peripherals such as the currency detectors for coins and banknotes found in a diverse range of automatic payment equipment such as transportation, ticketing, payphones, amusement machines, and retail cash management use ccTalk to talk to the host controller. The first release of the protocol was in

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Help Wikipedia improve by adding precise citations! September Learn how and when to remove this template message ccTalk pronounced see-see-talk is a serial protocol in widespread use throughout the money transaction and point-of-sale industry. Peripherals such as the currency detectors for coins and banknotes found in a diverse range of automatic payment equipment such as transportation, ticketing, payphones, amusement machines, and retail cash management use ccTalk to talk to the host controller.

The first release of the protocol was in The main difference is that it uses a single two-way communication data line for half-duplex communication rather than separate transmit and receives lines. Each peripheral on the ccTalk bus must have a unique address. The original protocol operated at baud with subsequent releases standardising on baud.

Advantages of ccTalk include low cost UART technology, a simple-to-understand packet structure, an easily expandable command interface and no licensing requirements. The latter affords the protocol a good deal of popularity in a crowded and highly competitive field similar to open-source software. In , DES encryption was added to certain commands so that it could be made more resilient against attacks on the bus.

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This follows the talk I made at Defcon this year slides here : defcon Message format A ccTalk frame is composed of the following elements : [destination] [length] [source] [header] [data] [cheksum] Destination : The destination address Length : The data length to follow Source : The source address Header : The actual command sent to the device Data : header-related data The data length is limited by the specifications to Addresses The addresses are encoded in a byte, which means that a maximum of devices can be used on a single bus. The address 0 is the broadcast address. All devices must process the request and respond with source address 0. Headers The header field is the actual command sent to the device, it contains a single byte representing the action that must be taken by the destination device.

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