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What Type Of Resistor Is Needed?
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BobA:
Those terms were about as basic as they get.  If you don't understand them you should probably not wire the circuit yourself.  Get someone to assist who has a basic electronics knowledge.
AndyWarne:
This is always a tricky subject because there are so many ways in which coin mechs and credit boards work. Most mechs and boards send a 12 volt signal and then drop to ground momentarily when a coin is inserted.
Also, most have an "open collector" type of signal which is not actually tied directly to 12 volts when there is no coin, but is allowed to float to 12 volts. This means its safe to connect to the I-PAC with a zener diode added for safety to prevent the voltage rising above 5. You will need a 5 volt (or 5.1 volt) zener diode.
There is a diagram on www.ultimarc.com/controldiags.html showing this.
The problem is, we don't know what your credit board sends exactly, but this is the most likely scenario.
Andy
BobA:
You will have to verify what type of signal your coin unit provides.  If it is as Andy says then you will not need to invert the signal as the circuit I provided does.   As stated previously you need to have some electronic knowledge to sucessfully interface your coin unit.
lettuce:
So its the Coin Signal wire that goes to the Coin input on the I-PAC then? And the Coin Signal and Ground wires need to be connected together with a 5.1v zener diode, right?
AndyWarne:
Thats correct, assuming its the type of signal I described. The diode needs to be the correct way around, see the diagram on www.ultimarc.com/controldiags.html
Andy
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