The bill acceptor messaging is using the same 5 events buffer plus an event counter. But there are some differences.

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The bill acceptor can use an escrow mechanism: read the bill, notice the host of it’s value then accept or reject the bill as instructed by host. As in coin messaging Result B = 0 is bill accepted but Result B = 1 means valid bill held in escrow. Result A shows the bill channel. This example does not use escrow.

The encoding of the bill value format is CCVVVVI where CC is the country code VVVV value and I the issue code all in ASCII format. This time the field value uses only digits, no dots, m, k, M or G. To handle values larger than 9999 or less than 1 a country scaling factor is used. The answer to header 156 with country code CC as parameter returns three bytes: scaling factor LSB, scaling factor MSB, và the number of decimal digits all in binary , not ASCII format. Knowing the value VVVV as 1 khổng lồ 9999, scaling factor SS 1 to lớn 65536 & D decimal places 0 lớn 255 the bill value in major currency unit should be VVVV*SS*10^(-D). In practice only round values can be used for SS & it’s very unlikely lớn use more than two decimals.

Apart from this, due security reasons, the bill acceptor acts differently in case of communication loss. If a bill acceptor is not polled for five sầu seconds the acceptance is disabled and the host must use header 228 “Modify master inhibit status” lớn enable the acceptance again. Also a coin acceptor is supposed to disable the acceptance after 5 seconds of no communication but it must re-enable it at the first pool without any intervention from the host. As you noticed Money Controls , the mother of the ccTalk protocol didn’t even implemented the header 228 , the coin acceptor is always on. Though, you can disable all coins through header 231 “Modify inhibit status” if you need a break.

This behavior of bill acceptors can sometimes lead khổng lồ an undetected disabled state even if the event “Master inhibit active” is inserted in the sự kiện queue. We must then kiểm tra the state of the master inhibit from time to lớn time to make sure our bill acceptor is up.

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The number of bill channels can be sometime up lớn 64, it’s meaningless lớn interrogate 64 channels if they’re not implemented. The example shown in ccTalk documentation part 3 stops after one unprogrammed bill channel but we cannot assume that the programmed bill channels are contiguous. Most bill acceptors have 16 bill channels available but Ardac Elite used in this example has 64 channels. To interrogate bill ID only for available channels we can look at the data field size in the answer to header 231 “request inhibit status” , will be eight bill channels for each data byte., in this case eight bytes.

As you might notice the code is reused from the Arduino ccTalk coin acceptor example the included files are unmodified.

Due lớn many strings used for console messages Arduino compiler gives a “low memory error” you can google, the issue & solutions are widely discussed on Arduino forums, this might be problematic just in debug stage, you can remove sầu them later or keep only some of them.

You can find the zipped code on my google drive , I made the corrections for the “request bill ID” data field filtering.

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There was also another error at the kết thúc of the main file, where “(buffered_events Experimental Engineering for the feedbachồng.

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