The original ccTalk protocol did not use any kind of encryption. It was thought that the security in a serial interface was so much better than a parallel one that no. The ccTalk protocol is used to transfer information and commands to various money processing device, including coin/bill acceptors and coin. The OSI 7-layer network model is of limited use for a simple control protocol such as cctalk. Whereas the task of writing software for full-blown networking.

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This article is the first part of a series about the ccTalk protocol.

ccTalk – Wikipedia

This cctalo the talk I made at Defcon this year slides here: As multiple devices can be on the same bus, each of them has its own address on that bus so they don’t conflict with each other. 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. The header field is the actual command sent to the device, it contains proyocol single byte representing the action that must be taken by the destination device.

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Serial pulse protocol

All these headers are documented in the protocol specs and can take arguments that are added in the data field of a frame. For instance, header 0xfe is the pfotocol poll” header. Any device that receives this one needs to respond with an ACK packet ie an empty response frame. Regarding responses, all of them use protcol 0, which can be considered as an ACK packet. The header 5 is used as a NAK response. There is no indication about the initial request in the response frame.

Balda’s place

It is normally not a problem, as normally only the controller sends command to devices, but if we want to sniff data on the bus, we will need to know the request before parsing the answer. I couldn’t find any open source ccTalk sniffer out there to decode ccTalk frames properly, so I created two tools, one that can be used to sniff a ccTalk bus and show live packets and an other that is used to parse sniffed data and display frames in a nice curses interface.

Cctwlk the tools use a Python ccTalk library I made. This library is able to parse packets as well as generate new ones using few lines of code:.

The parser itself is easy to use, just pass a binary file and it will extract all ccTalk frames it can find:.

Using these tools, it is quite easy to actually understand how rpotocol ccTalk-enabled device works and use it in your own projects. All the tools can be found here: To test ccParse, here is a ccTalk traffic capture: Tags ccTalk ccSniff ccParse. The protocol Published on 11 August This article is the first part of a series about the ccTalk protocol.

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Message format A ccTalk frame is composed of the following elements: Addresses The addresses are proyocol in a byte, which means that a maximum of devices can be used on a single bus.

Headers The header field is the actual command sent to the device, it cctalkk a single byte representing the action that must be taken by the destination device. Examples Here are some example packets: Sniffing and interpreting data I couldn’t find any open source ccTalk sniffer out there to decode ccTalk frames properly, so I created two tools, one that can be used to sniff a ccTalk bus and show live packets and an other that is used to parse sniffed data and display frames in a nice curses interface.

This library is able xctalk parse packets as well as generate new ones using few lines of code: Any comments are welcome, just write me a mail: