TECHNICIANS' manual98 of 104
16.2.2 Communication protocol
Description of the operating principle with reference to the
diagram shown below:
• A beverage can be reserved from the till.
• The till sends the reservation-related code to the machine
(see the table).
• Start the selection reserved from the machine’s keypad
(e.g. 1 Espresso, Group 1 = 011 h).
• The machine sends the pressed key-related code to the till.
• If the code from the machine matches the reservation
code, the till consents for the order to be dispensed by re-
sponding with ACK = 06H.
• If the code does not match, the till will respond with NACK
= 0H.
Baud rate: 1200, 8 bit + 1 bit Stop. Parity E (even).
BUTTON PRESSED
BUTTON CODE
RESERVING BEVERAGES
ACKNOWLEDGED
DISPENSING
2
3
1
4
5
To Next Page