I have a project to build a vending machine but I am suffering from Scarce information about vending machines.I could find some results:. Inner protocol in vending machine and between the PC is called and is specified. This is a protocol between a master (VMC) and up to 32 slave (peripherals) and could be implemented using UART (according to protocol V3 ).
is another protocol used for coin detector machines. There are lots of adapters and devices(all of which are closed source) that use this protocol.According to this information why do I need to use the MDB protocol given that it is finally a UART connection? Why couldn't I use my own language (protocol) especially if I will build all of the peripheral by my self?
What are the advantages and disadvantages?Anyone looking for further information and resources is welcomed to read about either CCtalk or MDB. $begingroup$ No offence, but I think that you will find 'I will build all of the peripheral by my self' rather difficult & time consuming. Have you considered the difficulty of developing peripheral to accept and validate coins & notes?
If people can pass fakes and obtain goods, you have a problem. Some security features in money a government secretes, which they will share with large, carefully vetted, companies, but not with you. Use an accepted industry standard, but all Off The shelf components, and develop only the controller board yourself. $endgroup$–Jun 21 '17 at 12:18.
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Since vending machines handle money, they may be a target for attack, and security at all levels (mechanical, protocol, data security) then become important. The MDB protocol specifies the format for communications between the Vending Machine Controller (VMC) and the peripheral devices. The MDB protocol is more than just the serial frame types as it specifies the whole flow of a vending machine transaction amongst other things.From a serial communications point of view, perhaps the most relevant factor is that the MDB protocol specifies 9bit serial. Specifically it's 9600 baud NRZ with 1 start bit, 8 data bits, 1 mode bit and 1 stop bit. (The mode bit is essentially just the 9th data bit).
Because of this you must make sure that any UART you are using will actually support 9 bit mode. Additionally if you are interfacing with a preexisting VMC you have to be aware that the protocol specifies some hard limits on timing. Any peripheral must respond to a VMC poll within 5ms. Interfacing with computers/devices can be difficult because many serial ports and serial libraries only support 8bit serial. If you are connecting directly between a computer and a MDB VMC then you might not be able to guarantee a response within the amount of time specified in the standard, in which case a specialized device would be needed. These points (and more) were reasons for the MDB adapter project that was the designer for. Unfortunately for the purposes of the question this was a closed source project so I can't go into much more detail.So if you plan to use pre-existing vending machine parts then using the MDB protocol might save troubles later.
It should be noted that there's VMC manufacturers that are providing other interfaces than the MDB however the MDB protocol is currently the most widely supported protocol in the industry (as of the time of this answer).If you are making something that will never be used with anything from the vending industry then feel free to use your own protocol if that provides a better ROI. If you are only connecting one device to the VMC then the MDB protocol might be overkill. If you do go down this route you might find some interesting ideas in the MDB protocol that are relevant to your design. Especially keep in mind the flow of transactions involved in a vend, this is probably one of the hardest things to get right. The benefit of MDB is it is the most current, universal, and widely used communication system for vending machine parts.
If a device for vending is made, you can rest assured that it is compatible with MDB. If you want your devices to be compatible with other machines, use MDB.Earlier protocols include:. Single Price Interface (Very outdated). All parallel communication @ 120v, repricing was done by rearranging wires. This is a highly outdated interface that most vendors replace. LowLevel/HighLevel Pulse (bill validators, outdated but still in use). This was in use right before MDB came out.
A bit outdated, used a mix ofserial and parallel communication. Still in use by outdated machines. The difference between low level and high level, is the voltage used to communicate. Low being 24v, and high being 120v. MicroMech (Coin Changers). The protocol used alongside HLP/LLP bill validators. Basically identical except the connector looks a lot more like a smaller version of the SPI connector.
Also there is a 24v version and 120v version. A 24v MM machine can use a 120v MM device if you add two jumpers to the connector, I believe the 120v versions just have solenoids designed for 120v use, which you can just supply 24v to. CCTalk. I've never used nor have I ever seen a device that uses this. Based on your wiki link, it's a contender to MDB that is vary similar but didn't quite make 1st place. I see the option to use it on most machines though.
ID003. Another I have never seen, actually never heard of until I just googled it right now. It appears to be dominant in arcade games as the communications method for payment devices.
How do you connect a device to your computer? Through ports, of course. Just plug your device in to the port,. Wait a minute, the plug will not fit into the port! This might happen, if you are trying to connect a device with a FireWire plug, to your computer's USB port.
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So what is a FireWire port, and what is the difference between it and a USB port? Once you are savvy with the real deal, the most obvious question is whether you can you convert FireWire to USB! To find out the answers to these questions, read on for an in-depth look at these two port specifications. The PCI card can be inserted into a laptop or PC and installed. So your computer will have FireWire ports, and the high-speed advantage is also present. Some models are:.
HDE 7 Port USB Squid Hub ($6). Sonnet Technologies USB/FireWire Expresscard 34 ($50). IOGEAR Universal Hub GUH420 ($30). StarTech 2 Port ExpressCard Laptop 1394a ($45). Belkin FireWire 6-Port Hub ($40)While every computer has USB ports and they are easily identifiable, your computer might have a FireWire port, and you can't find it or have confused it for some other port. The best way to identify the FireWire port on your computer is to look for the logo. In desktops, all ports are located on the back of the CPU cabinet.
With laptops, the ports are located along the side of the computer. Take a closer look at the ports and you might find a FireWire port, hiding among the others.
I'm talking of something on the lines of a Pinnacle Studio Moviebox Plus USB. What it does is way more than what this article wants it to do, but it can solve our problem effectively. The device basically acts as the mediator between the two data ports, the USB that goes to the computer, and the FireWire that comes to the device from your camera. Both analog and digital video types can be converted to the USB 2 format at a claimed loss-free rate. The only thing that may stop you is the price, which is actually moderate for all the things that you can do with it. Consider this a final alternative, in case you do not have an extra slot to install a PCI card in.