5
2.4.2 Display Head
The display head is supported from a column on the master module and contains the electronic
calculator, displays, power supply and motor switching circuits. These are all housed in a
fibreglass enclosure with a window in each side. Illumination is by fluorescent tubes.
2.4.3 Electronic calculator
The electronic calculator known as CoCa and comprises the following modules:
Uninterruptible power supply (UPS) Maintains displays and transaction
with external batteries information during power failure.
Calculator control module Controls the hydraulic units and communicates
with kiosk equipment (if connected).
User interface module Contains the transaction displays.
High voltage module Interfaces to nozzle and motor switches.
Infra-red remote control module In stand-alone mode this module allows dispenser
parameters to be set; unit prices etc.
2.4.4 Transaction displays
The dispensing unit contains two display boards, one on each side of the display head. The
board contains 7-segment Ferranti Packard electro-mechanical displays for price-to-pay (5
digit), volume (5-digit), and pence per litre (4 digit). Grade indication is by means of a LED
next to the appropriate grade indication legend.
2.4.5 Infra-red remote control (Figure 3)
When in stand-alone mode the dispenser configuration, unit prices etc. can be programmed by
means of the infra-red remote control. A key switch is located on the underside of the display
head. This key must be operated and a PIN code entered, via the remote control, before any
programming can be achieved.
If programming is attempted during a delivery ignores any instructions from the remote control
unit and continues as normal. Unit price changes are not possible whilst a delivery is in
progress.
2.4.6 Peripheral connection
Interfacing to peripheral equipment is provided via an RS232 port and to the kiosk control
equipment via a current loop.
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