SR3 Type 1 Technical Manual
TSP005.doc Issue 5.0 – Jan 2005
Money Controls 2005. All rights reserved.
Page 12 of 50
5.2 Coin Accept Outputs
Each coin accept output consists of an open collector NPN transistor. On acceptance of a
true coin the transistor is turned on for a period of 100ms (+/- 20%) to less than 0.7 volts at a
Max. 50mA. The host machine must look for valid credit pulses NOT LESS THAN 50ms. It is
not sufficient to merely detect the edges of credit pulses. This ‘debounce’ will prevent credits
being registered by the host machine as a result of any noise or false credit pulses being
induced on the output lines.
Figure 8: Coin Accept Outputs
5.3 Reject
Each time the reject lever is pressed, a lug on the reject lever breaks an optical beam,
situated on the PCB. This is read by the processor and an output signal is sent to pin 5
(reject operated) on the parallel connector.
This output will remain active for as long as the reject lever is pressed, to less than 0.7 volts
at a Max. 50mA.
Figure 9: Reject Operated Output