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Is there any way of using one of unitronics PLC's to send prices to a credit card machine to automatically charge for what is used? Like for example in a car wash? or for where liquids are automatically dispensed to customer's containers?

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The Unitronics PLCs can output data in various formats, over RS232, RS485 or Ethernet. These would be the most likely interfaces for a POS (point of sale) machine.

The first big question is what kind of interface does the credit card POS machine have? I presume they have an interface to take data from other POS equipment, like cash registers.

The other question would be to check if there are any special security protocols required.

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