Milan / Paylink System Manual Issue 1.5 29 January 2020
CONFIDENTIAL
Not to be disclosed without prior written permission from Aardvark Embedded Solutions Ltd
Page 42 of 71
Meters / Counters
The Paylink units support the concept of external meters that are accessible from the outside of the
PC system.
In keeping with the Paylink concept, an interface is defined to an idealised meter. This will be
implemented transparently by the card using the available hardware. Currently the Paylink unit will
support either a Starpoint Electronic Counter, or from 1 to 8 mechanical meters.
Mechanical Meters (1.12.4)
From 1.12.4 onwards, Paylink supports mechanical meters, driven using pulses through the general-
purpose high power outputs. Suitable meters are required to operate on DC at 20 pulses per second
or faster.
Configuration file entries are used to map Counter Numbers 1 to 8 onto the Paylink outputs.
Paylink records how many pulses have been sent, and how many are currently required. It attempts
to handle the fact that while the pulses are being output the power may be cycled. Paylink updates its
non-volatile memory as it turns on the transistor at the start of the pulse. This means that during a
power cycle, at most one pulse may be lost (as it is not driven for long enough) but no spurious
pulses can be generated.
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