Vfm4 Non-Isolated Serial Interface - Aristocrat USA MAV500/MKVI Service Manual

Bill Acceptor
An upper cavity is created in the box that contains the stacker drive mechanism
sealed from the bill compartment. The compartment contains a blind mate connector
to the bill acceptor, and the memory module for electronically storing stacker
identification, diagnostic and content information
A motor/pusher plate assembly within the stacker accomplishes bill stacking. The
unit consists of a motor driven, slider-crank mechanism. On receipt of the
appropriate signal from the bill acceptor, the motor turns through one revolution that
cycles the pusher plate through one complete linear extension-retraction cycle. On
extension, the pusher plate moves the bill past the bill support rail against the
pressure plate. On retraction, the bill is trapped below the support rail and held there
by the pressure plate.
Bezel
The bezel assembly is mounted to the uppermost portion of the upper guide assembly.
The assembly provides currency alignment and guidance into the bill acceptor
transport mechanism.
To facilitate the player recognition of the bill insertion area, eight green LEDs flash
in a "runway" type effect when the machine is in idle mode. A ninth, red LED
flashes if the bill acceptor operation is inhibited for any reason.

9.1.3 VFM4 Non-isolated Serial Interface

The serial communication protocol used to interface with the bill acceptor conforms
to the Mars VFM4 standard. This interface provides one-way communications with
the control system; where messages are sent, via the
to the control system in response to the control lines. Three control lines are used,
,
ACCEPT SEND
bill acceptor to control system.
In normal operation, the control system activates the
and the bill acceptor is ready to accept money. After the validation process, a
DENOMINATION
unsuccessful processing is sent to the control system.
The bill acceptor pulls the
intention to send a message. The control system responds (T1) by dropping the
line low, which grants permission to the bill acceptor to send data. After the
line becomes low (T2), data comes out via the
start bit, 8 data bits and 1 stop bit, at 600-baud rate. After the control system receives
the last bit (T4) it raises the
the
INTERRUPT
If the validation is not successful, the bill acceptor sends the
control system and then waits for another bill to be input. The
tells the controller of the end of the communication session.
9-10
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and it may not be copied. All rights reserved. © Copyright (ATI) Aristocrat Technologies, Inc. 2002.
(from the control system to the bill acceptor), and
message for successful evaluation or a
INTERRUPT
line high. The bill acceptor responds (T3) by raising
SEND
line high, which completes the transmission of the first message.
USA MAV500/MKVI Service Manual
line, from the bill acceptor
DATA
ACCEPT
REJECT
line low and informs the control system of its
line in a serial fashion with 1
DATA
from the
INTERRUPT
line by pulling it low,
message for
SEND
SEND
message to the
REJECT
message also
REJECT
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