SCH2 Technical Manual TSP016.doc Issue 3.0 – January 2005
Money Controls 2005. All rights reserved.
Page 11 of 61
9. Product
Features
SCH2 represents to date the most sophisticated serial coin hopper in the world. Responding to
comments from the leading UK machine manufacturers, Money Controls has designed in an
unprecedented level of security.
The following features are available on SCH2…
¾
Coin dispensing security. The serial command to pay out a coin uses a 64-bit encryption
key which changes randomly after each operation. This makes serial ‘cloning’ whereby a
handheld terminal listens to the serial bus and plays back dispense commands a fruitless
exercise. A typical dispense cycle will see a total of 192 bits of random information
transferred across the bus.
¾
Payout modes. The hopper defaults to multi-coin payout mode which pays up to 255
coins in a single dispense command. For extra security the hopper can be placed in
single coin payout mode which only allows one coin to be paid out at a time.
¾
PIN number security. There is an option to protect the hopper with a PIN number so that
if it is stolen from a machine and plugged into another one it cannot be made to work. It is
the equivalent of a mechanical lock with the machine manufacturer generating and
keeping the key.
¾
Opto security. During idling ( no coins being paid out ), the exit optos are randomly
pulsed. If a blockage is seen while driving the opto or a short-circuit seen while not driving
the opto then an alarm condition is generated. During pay out, if a short-circuit is seen
while not driving the opto then an alarm is generated. Blockages are usually caused by
inserting objects into the hopper exit and short-circuits by shining torches or lasers into
the optics.
¾
Motor terminal protection. A heavy duty mechanical relay protects the motor terminals by
shorting them out during idle. Any attempt to pay out coins by placing a 9V or 12V battery
across the motor terminals will merely short out the battery.
¾
Anti-jam operation. If the hopper experiences a coin jam during a payout sequence it will
automatically reverse in order to clear the jam.
¾
Software fuse. If an absolute maximum current threshold is exceeded ( factory pre-set )
then the hopper aborts payout with an error code.
¾
Polyswitch protection. The motor driver terminals are protected with a polyswitch for
additional overload protection.
¾
Power fail protection. A non-volatile memory keeps track of coins paid out. If power is lost
during a payout sequence then the residual number of coins to pay can be read back
after the machine re-initialises.
¾
Unique serial number. Each hopper is manufactured with a unique 24-bit serial number
which cannot be modified by external means.
¾
Coin counting. Two counters record the number of coins paid out of the hopper. One is
reset-able by the user, the other is a life counter. Both are implemented in NV Memory.
Continued…
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