GBA Global Bill Acceptors
GBA ST1C Operation Manual
Page 19 of 30
Astrosys International Ltd
GBA ST1C Operations manual V1_4
5.3 Low Power Mode
This mode is designed so that the ST1C unit remains in hibernation, drawing very low power, until
a note is presented at the front. At this point it will wake up immediately and process the note. If
no other note is presented within 2 seconds, the unit will return to hibernation.
While asleep, the illuminated note guide will “blink” briefly every few seconds to show that the
validator is in service. If the ST1C had a fault before going into hibernation (e.g. a note jam) then
the note guide remain dark.
The “Use Low Power Mode” option must be set via GBA Talk or Service tools.
In this mode the quiescent current drawn by the unit is reduced to 10 µA by remaining in
hibernation until a note is presented.
5.3.1 Electrical Connections:
The 12 Volts dc power should only be connected to pin 17 of the 20 way connector – pin 16 must
not be connected to the supply. When the ST1C wakes up, the 12 Volt bus is energised. Pin 16 can
then be used either to provide power to another device or to wake up the host controller. The
maximum supply current is 200mA.
See section
6.0 ELECTRICAL CONNECTIONS
.
5.3.2 Interfaces Supported in Low Power Mode
Low Power Mode is intended to be used with either Pulse Mode or Parallel XT Mode. (Unlike
standard Parallel Mode, Parallel XT mode uses the BUSY line to signal the host when it is
activated.)
The ST1C can also be controlled using the ccTalk serial protocol, although the implementation will
vary from the standard process.
5.3.3 Operational Features:
1. During the wake up process, the ST1C will pull the BUSY line low (pin 3), keeping it active
during the entire transaction. Therefore, the BUSY line can be monitored and used to wake
up the host if this is also put to sleep to save power.
2. The ST1C will return to sleep mode 2 seconds after all activity has ceased. However it will
wake up again on any new note presentation.
3. Therefore the host should latch its power supply on wake up to allow the machine to
complete the customer transaction rather than rely on ST1C to keep it awake.
4. Should the host need to wake up the ST1C at any point, this can be achieved by pulling pin
18 low and keeping it low as long as ST1C is required. This feature can be used to run tests
on the ST1C or download an updated note dataset.
5. If the host is using the ccTalk serial interface then:
a. It does not need to enable the ST1C or the notes when it wakes up. The ST1C will
scan the note immediately, and hold it in escrow. If the host fails to begin polling
the ST1C within 7 seconds after the wake up signal is issued then the note will be
rejected.
b. The Inhibit Line must be connected to ground, or pulled low by the host, before the
note is scanned into the ST1C. This allows the host to signal if it wishes the ST1C to
even start scanning.
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