Theory of Operation February 5, 2004 2-7
X_RAY_ON_ Generator to PXCM The Generator is emitting X-rays.
Activation:
When the HV is applied to the X-ray tube, the signal is
activated.
Deactivation:
When the HV is switched off, the signal is deactivated.
Note: The emission can be pulsed but the signal will stay
on for the duration of the full exposure.
DR_SYST_RDY_ PXCM to Generator The DirectRay Detector subsystem is prepared for an
exposure request.
Activation:
When the DirectRay system is ready to receive the signal
PREP_DR_DET_, the signal DR_SYST_RDY is activated.
Deactivation:
When the signal GEN_RDY_FOR_DR_EXP_ is
deactivated, the signal DR_SYST_RDY_ is deactivated.
For timing requirements, see t_dly_from_exp_finished.
DR_DET_ERR PXCM to Generator An error is present in the DirectRay system.
Activation:
When there is an error condition within the DirectRay
system, the signal is activated.
Deactivation:
When the error condition has been cleared, the signal is
deactivated.
GEN_POWERED_ON_ Generator to PXCM The Generator is powered on.
Activation:
Whenever the Generator is powered on, the signal is
activated.
Deactivation:
Whenever the Generator is powered off, the signal is
deactivated.
Table 2-1. Exposure Signals Between PXCM and Generator
Signal Direction Description
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