SCH2 Technical Manual TSP016.doc Issue 3.0 – January 2005
Money Controls 2005. All rights reserved.
Page 52 of 61
24. Appendix B
24.1 Timing Parameters
Table 11: Timing Parameters:.
Nominal values are shown.
Label Description Value Units
Xtal PIC Resonator 4.0 MHz
Brate Serial communication baud rate 9600 baud
Trxout Receive data timeout 25 ms
Vtrip Power-fail trip threshold ( +24V motor ) 16 V
TPinit Power-up initialisation time 600 ms
TSinit Software reset initialisation time < 40 ms
TMRelOn Motor-on relay delay 25 ms
TMRelOff Motor-off relay delay 25 ms
TMreverse Motor reversing time 150 ms
Irelay Motor protection relay rating ( surge ) 10 A
TEESave EEPROM data save time 17 ms
Ifuse Absolute maximum trip current 5 A
Tlevdeb Level sensor debounce time 2 s
Comms reply delay : Simple poll < 2 ms
Comms reply delay : Enter PIN number ( correct ) < 2 ms
Comms reply delay : Enter PIN number ( wrong ) 235 ms
Comms reply delay : Write data block 8 ms
Comms reply delay : Dispense hopper coins < 4 ms
Comms reply delay : Request hopper status < 2 ms
Comms reply delay : Pump RNG < 2 ms
Comms reply delay : Request cipher key < 2 ms
24.2 Opto Security Timing
When idle, the hopper software tests the optos on a pseudo-random basis to make a
deliberate fraud attempt much harder. The sampling period varies between 15 and 255
milliseconds. When paying out coins, the sampling period changes to between 64 and 127
milliseconds.
24.3 Hopper Initialisation
No serial communication is possible during the ‘TPinit’, ‘TRinit’ and ‘TSinit’ time.
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