User manual

Page 21
Document No. 80-15151 Issue 6 HEBER LTD
6.4 Interfacing to Coin & Note Acceptors
Most Coin or Note Acceptors have open collector (“sink to ground”) outputs. These may be connected
directly to any of the Pluto 5 Inputs (IP0-31). Mechanism “Enable” or “Control” inputs may usually be
driven directly from any of the Pluto 5 Open Drain Output lines (OP0-63).
6.5 Interfacing to Coin Payout Mechanisms
Payout Hoppers that require relatively low drive currents, e.g. Coin Controls Universal Hopper, may be
driven directly from an Open Drain Output. Higher current devices, such as 50Vac or 24Vdc Payout
Solenoids, should be driven using Open Drain Outputs via a suitable Triac or Relay Interface Card.
Heber produces a number of suitable interfaces.
6.6 Driving Vacuum Fluorescent Displays (VFD)
The standard VFD/Linewriter display used in most Gaming/Amusement Machines is driven by 3 TTL
level signals, Clock, Data and Reset.
Connector P12 has 6 TTL level outputs which could drive up to 2 display modules.
The mapping of these outputs as the LSB of 6 bytes makes it convenient for the software to implement
the bitwise drive required.
6.7 Using the External I
2
C Bus
Connector P13 is intended for driving external boards containing I
2
C Bus components. A common use
for this could be the provision of a removable E
2
PROM Module for use in Spain or any other country
with a similar requirement.
Heber have available a small PCB containing a NM24C04 or NM24C08 E
2
PROM that plugs directly on
to P13.
On this connector, the SDA line is driven by the Open Drain Output, AUX7 and may be read by the
68340 Timer Module as the (inverted) TGATE2- signal.
Similarly, the SCL line is driven by AUX6 and read by TGATE1.
6.8 Driving Meters
Electromechanical Meters or Counters should be 12V DC parts. The common +12V supply to them
should be the Vmeter+ supply from Connector P9 (“I/O 2”), pin B17 and each should be driven by an
Open Drain Output (OP0-63).
As the meter is pulsed ON, the software should check that the Vmeter Current Sense Input has
operated, i.e. that pin PORTB4 has gone high.
Because of possible delays in responding to a meter being turned on it is recommended that the
software checks the current sense pin immediately before the meter is turned OFF at the end of a
pulse. To detect tampering or a failure of the current sense circuitry, the software should also check
that the current sense pin goes LOW when no meter is operated.
6.9 Making Sounds
Loudspeaker outputs on connector P10 are bridge driven, so do NOT connect either connection of a
loudspeaker to ground or to any other loudspeaker drive. Ideally 8Ω loudspeaker(s) should be used,
but higher impedance components could be used without any risk of damage to the amplifier. The use
of 3 or 4ohm loudspeakers should be avoided.