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GM
Vending, s.a.
Control electronics for the machines consists of several cards connected to one another through a
serial bus with MDB protocol. Three of these cards have their own microprocessor and their own program
that can write on the micro (Motor Card) or in a separate memory (Control and Display Cards).
Diagrama funcional de las tarjetas.
CARD FUNCTIONS.
•
The Power Supply Card is connected to the transformer and provides the machine with the 24
V/DC current needed by the extractors, hoppers, V-retainer and other peripheral devices, 34 for
coin assembly and the 8 V/DC current needed by the cards. Drawing 57003 shows the function of
each of the connection pins. The card comes equipped with two fuses.
•
The Control Card is the here the main program is located.
The program is in a 512-Kb EPROM memory. In order to write into this memory you need a PC,
software and a memory programmer.
This card has a RAM memory with a battery and a clock where all variables are stored (Pries,
sales, etc.) which the machine needs to work.
There are two control card models and the only difference is the number of motors each can
control. Obviously, the larger one can be installed in any machine and this is the only one supplied
as a spare.
There are three variants for drawing 57002 where the factory standard extractor, hopper and V-
retainer connections can be seen, depending on machine model.
This card also has a connection for a coin assembly with change using protocol A, but it does not
work in the machine program.
Each time we need to add options to the machine or modify its functioning, we need to modify and
substitute the program written into the EPROM.
Each time that a program is upgraded to a newer version, some variable may change in value. It is
therefore necessary to either initialise the machine or check it and re-program the variables.
Under normal machine working conditions the control card is continuously consulting the other
cards and the coin assembly in order to know what is going on. Each request is answered with a
report from each card and the coin assembly indicating what it is doing.
•
The Display Card checks the machine buttons and controls the front display.
It has its own microprocessor and program which is totally independent of the machine.
Drawing 57001 shows the functions of each pin of each connector. This card is always the same in
all models.
•
The Motor Card monitors the motors and micro-switches connected to it and reports to the main
C:\manuales\Elite\inglés\ELITEing10-02.DOC
CONTROL ELECTRONICS
Pág 5 de 49
Edición:09/02
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