User manual

Hardware Description
ComTec GmbH 3-6
When the PC is turned off the power supply connection between the BASE module and the PC is
opened by a relay inside the BASE module to prevent backloading of the PC power supply by
externally connected electronics.
3.3.4. FHS Link
The FAST High Speed (FHS) Link connects the MPA-3 frontend BASE module to the computer. It
provides full duplex high speed data transfer at up to 420 Mbit/s.
3.3.5. FMP Bus
The FMP (FAST MultiParameter) bus connects the subsequent modules and the BASE module.
All status and setup information from and to the subsequent modules respectively the individual
ADC ports is transferred over the FMP bus. More important, also the ADC data is transmitted
over the FMP bus to the BASE module for further transfer to the PC in listmode.
This bus furthermore transmits the DEADTIME signals of up to sixteen ADC input ports to the
BASE module for coincidence detection in COINCIDENCE mode and for ADC livetime
information that is transferred to the PC with a resolution of 1ms.
The systemwide 'GO' line is also available on the FMP bus.
3.3.6. Indicators
For a quick observation of the system status some LED indicators are provided on the BASE
module's frontside.
First the 'POWER' LED shows - if green– that the power supply is sufficient for proper operation.
If it is off - even when the connection to the PC is made and the PC is turned on - the 'Extra
Power Cable' must be installed.
The 'ACTIVE' LED is illuminated green when the system is armed i.e. the MPA-3 is ready to
receive and transmit ADC data.
Figure 3.7: LED indicators in a 16 port MPA-3 system