[ ] is an alternative approach to connecting multiple modules to a memory controller. Since 2000, multidrop standards such as and are increasingly being replaced by systems such as and. Contents • • • • • MDB in vending machines [ ] The multidrop bus used by controllers to communicate with the vending machine's components, such as a, is also called MDB (for Multi-Drop Bus). In use since the 1980s, it is now an open standard of the, or NAMA. The devices communicate in a single-master, multiple-slave configuration using the MDB, which is based on a [ ] 9-bit implemented as an 8-bit data value with an additional mode bit. The mode bit differentiates between ADDRESS and DATA bytes.

• Parallel Interface

It uses optically insulated RX and TX which is good for the noise protection RS232 like 9600, 9 bits no parity 1 stop bit. It uses a simple checksum to check the integrity of the data packets A drawback is that it uses 9’th bit signalling that isn’t supported by most PC operating systems. As a workaround the serial port must be reset at the runtime or some kind of translation hardware interface must be used. In exchange most micro controllers have special features to easily detect and use the 9’th bit signaling. The voltage supplied by the MDB connector must be around 34 V or the peripheral must have it’s own power supply.There is also support in the protocol for power management.

The Fritzing ccTalk interface misses a common ground from serial TTL connector to ccTalk connector, don’t forget to add this connection on the interface board to avoid burning the Arduino board. The board connector looks like the AWP industry-standard interface from page 20 in the part 1 ccTalk documentation.

In 2010, encryption was added to certain commands so that it could be made more resilient against attacks on the bus. Each peripheral has its own unique DES key. Contents • • • • • An Example ccTalk Message Packet [ ] TX data = 2 0 1 245 8 • 2 = destination address • 0 = zero data bytes • 1 = source address • 245 = command header ‘Request equipment category id’ • 8 = checksum ( 2 + 0 + 1 + 245 + 8 = 256 = 0 mod 256 ) This is a message from address 1 ( the host ) to peripheral address 2 to find out what it is. RX data = 1 13 2 0 67 111 105 110 32 65 99 99 101 112 116 111 114 22 • 1 = destination address • 13 = 13 data bytes • 2 = source address • 0 = reply header • 67114 = ASCII for ‘Coin Acceptor’ • 22 = checksum ( sum of all packet bytes is zero ) The reply from address 2 back to address 1 identifies it as a coin acceptor. Details [ ] The ccTalk protocol is a byte-oriented protocol. The series of bytes in a message -- represented above as a series of decimal numbers -- is transmitted as.

Parallel Interface

Cctalk Serial Communication Protocol-Condor Plus Specification-Issue 3.1. Both serial and parallel interface techniques have advantages and disadvantages. Parallel interfaces are fast and in some applications provide the simplest way of transferring information. The USB interface for ccTalk permits to connect a device which operates according to the ccTalk protocol to the USB port of a Personal Computer. The serial converter. The COM port emulation driver must be installed after this has completed. As a workaround the serial port must be reset at the runtime or some kind of translation hardware interface must be used. In exchange most micro controllers have special features to easily detect and use the 9’th bit signaling. CcTalk tutorial, ccTalk on Arduino nano part 5 bill acceptor example March 13, 2018; ccTalk tutorial.

Many thanks in advance, Richard Like. I see that PL232TA is using 3V not 5. I had this issue when I burned the USB to serial TTL converter but this happened only when I did something very wrong, I forgot a ground wire or I had a short to 12 V on the data line. Are you having loopback answer without connecting the coin acceptor?

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With the noticeable exception of JCM’s ID003 for which you will find devices from many producers (not as many as ccTalk though) you will be stuck with a single or at most two suppliers and if some reason the product will not be available you will have to write a new software. Why not USB protocol? There isn’t a true USB protocol accepted as a standard in the industry and that will include them in the “Other serial protocols” category. What is accepted as a standard is ID003 or ccTalk over USB which is only a matter of interface, some devices have a built in USB to serial/ccTalk cable.

Use the transistor schematic. I really don’t see where is the trouble with the mirrored message on RX. It works the same with the interrupts or polled, first check the consistency of the received message with the sent message then receive the answer.

The bus is driven at every transmitter by an transistor driver, and isolated at each receiver with an - though cable harnesses carrying the communication signals may also carry 24-volt power and ground signals to devices, meaning the devices may not be isolated from each other as they share the same power bus. Some devices, however, may have alternate power supplies, especially devices with motors and high current needs such as vintage bill acceptors or devices.

Is the same as the the pulse protocol but each coin have it’s own output, this way the time to read a 5 Eur bill is the same as for a 100 Eur bill. The down side of this is that the host machine will need one input for each bill / coin channel. If you use also the individual enable inputs you will have a large data bus, with large connectors. The security is somehow higher due the redundancy in the data received by the host machine. Binary serial Uses a RS232 or TTL levels RS232 to send a byte for each bill accepted. For simplicity can be the bill/coin value like 0x05 for 5 Eur 0x0A for 10 Eur, 0x32 for 50 Eur and so on or the bill / coin channel like 0x01 for 5 Eur, 0x02 for 10 Eur and so on. The security is still pretty low but it’s fast and at a minimum needs only one data wire.

I’m not related to any of the following companies or websites. I didn’t verified any seller, software or item with the exception of the simple USB cable ( because it was simple ) one Acrosser board and the cables in the second blog post. Here are links to other sites, many thanks to their owners. You can find some more links in the “” post. I didn’t upload any documentation, source code or utilities that I don’t own because I don’t want to break any intellectual property law but if you really need something and cannot find it here or anywhere just ask me by mail to ccTalktutorial at gmail dot com or in the comment (better) ccTalk official documentation Later edit: The upper link to cctalk page is broken but the documents are still available as direct link: Second later edit, the direct links are also broken now, I changed the links to WordPress.

The ci2.exe keystroke edition can send a keystroke on cash in, e.g. F6, to any program.

CcTalk source code • C# – • Java – • Java – • Python – • Python – • Visual Basic 2008 in and. Very few as you can see, I didn’t tested any of them excepting mine, many are incomplete but you can use them as a starting point. Ready made solutions If you’re targeting a quick small series where you need to drive more ccTalk peripherals and even non ccTalk devices, some companies have hardware + software products to handle the low level protocol with a software interface much closer to what a PC programmer is used to handle. • The one that I strongly recommend, the oldest and still the best is the Milan/Paylink interface. It’s over ten years in field ensures reliability, it can be supplied with all cables you need and it have also some input lines for buttons or sensors and some output lines that can handle low voltage relays or light bulbs.It can drive ccTalk, ID003, MDB and CCNet devices It’s also fully documented without any bullshit non disclosure agreement.

Price per piece: 15,00 EUR (plus VAT) Accessory: Makes it possible to connect NRI G40 coin validator to the CASH-Interface via 10pol. Flat ribbon cable (G13 plug). Price per piece: 9,95 EUR (plus VAT) Accessory: Note dispenser ND-300 Adapter Makes it possible to connect ND-300 note dispenser to the CASH-Interface2 via original ND-300 cable. The adapter can also be used to have one extra input and output for the CASH-Interface2, e.g. To be used with the photo booth system. Price per piece: 9,95 EUR (plus VAT) Ready to use CASH-Interface2 software: Please place your order via the Please send us your inquiry via.

2 free useable inputs, e.g. To connect push buttons. 2 free useable outputs, e.g. To connect lamps or other actuators. 1 output as relay contact. Watchdog function, that means the acceptance is deactivated on errors.

MDB originated as a proprietary bus used by CoinCo for their coin-acceptors in the late 1980s and was deployed in high volume in vending machines for. Coke forced CoinCo to it in 1992 to increase competition, and NAMA released the first version of the standard in 1995, allowing other vendors to compete for the coin-acceptor portion of the vending machines (CoinCo and Mars were the 2 major suppliers in North America at the time) and also enabled alternative payment schemes (e.g. Based) to be connected to existing vending machines. Bus addressing is based on the device type only, which allows for a very simple protocol stack, as no initial enumeration needs to be performed.

Jumper closed is mode1, jumper open is mode2. For +24V DC hopper it is possible to connect an external power supply.

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The series of bytes in a message -- represented above as a series of decimal numbers -- is transmitted as. Many devices have single electrical connector that carries both power (typically +12 V or +24 V) and the ccTalk data over a total of 4 wires. To reduce cost, for short interconnection distances CPI recommends sending ccTalk data over an unbalanced open-collector interface: both transmit and receive messages occur on the same bi-directional serial DATA line at, driven through an open-collector NPN transistor.

Binary parallel Is a variant of parallel pulse protocol where a the outputs are valid only on the edge of a clock line, this allow using combinations to represent the bill channel so 16 bills can be signaled using 4 data outputs and a clock line. MDB serial protocol Is a serial protocol designed for vending machines, the security is pretty high with error recovery, many kind of devices can be driven including cashless audit and age verification devices.

Having problems work thru this checklist, this should help to fix your issues! • If the COM port is open, the answer from the board with all settings must appear in the log. If not, there is something wrong with the connection to the CASH-Interface2, or simply the wrong COM port setting. Important: Check tight cable connections and the power supply is connected correctly. Using a USB to serial converter the correct COM port number can be found in the Windows device manager, see above video.

Use the transistor schematic. I really don’t see where is the trouble with the mirrored message on RX. It works the same with the interrupts or polled, first check the consistency of the received message with the sent message then receive the answer. It is useful to diagnose a ccTalk line shorted to ground. There is a hardware option to suppress the echo but it’s buggy, you can find it on page 13 of this document: but take into account that if your ccTalk line is shorted to ground this circuit will send data back to RX, you must handle that somehow. Also some unexpected spikes can occur on RX due the line capacitance. I don’t know any ready made chip solution.