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TECHNICIANS manual
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18.2
DEBIT-CREDIT system with direct connection to the till
The DEBIT-CREDIT system allows beverages to be
paid for after they have been dispensed, as the doses
are registered by the coffee machine’s till.
The system is structured as follows:
The beverage is dispensed.
The dispensed beverage
is registered at
the till.
The physical connection between the machine and
the till is via RS232 serial communication.
When activating, proceed as follows:
•
set the enable parameter P14 = 2.
•
set the enable parameter P312 = 2.
•
The till management software and the standard CS serial cable
is not the responsibility of the manufacturer.
18.2.1 Communication protocol
Description of the operating principle with reference
to the diagram shown below:
1. Select the desired dose on the coffee machine;
2. The code that corresponds to the selection is sent
to the till (see the code table);
3. The till replies with
ACK=1H
thus enabling the
beverage to be dispensed;
4. The coffee machine dispenses the beverage.
5. The till registers the dispensed beverage.
If the till does not identify the code, the machine is
not enabled, the selection is not dispensed and the till
sends the
NACK=0H
code.
1
2
3
4
•
Baud rate: 1200
•
8 bit
•
1 bit Stop
•
Parity E (even)
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