Enable Signals Configuration
The enumerated parameter FvalMode specifies the usage of the FVAL downstream signal; possible values are:
Value |
Meaning |
FA |
The rising edge of the FVAL signal is used as a Start of Frame; the falling edge is irrelevant. |
FN |
The FVAL signal is ignored by the board. |
FC |
Raw grabbing; start/stop recording on FVAL rising/falling edges |
The enumerated parameter LvalMode specifies the usage of the LVAL downstream signal; possible values are:
Value |
Meaning |
LA |
The rising edge of the LVAL signal is used as a Start of Line; the falling edge is irrelevant. |
LN |
The LVAL signal is ignored by the board. |
The enumerated parameter DvalMode specifies the usage of the DVAL downstream signal; possible values are:
Value |
Meaning |
DG |
The DVAL signal is a clock qualifier,only the data transmitted during clock cycles with DVAL=1 are captured by the board. |
DN |
The DVAL signal is ignored by the board. |
The MultiCam channel must be configured for the appropriate camera operation modes by assigning the appropriate values to the FvalMode, LvalMode, and DvalMode parameters.
Configuring Enable Signals for Area-Scan Cameras
The following combinations of values of FvalMode-LvalMode-DvalMode are allowed for image acquisition from area-scan cameras (Imaging=AREA):
- FA-LA-DN and FA-LA-DG are the recommended configurations for capturing fixed size images. The leading (rising) edges of the FVAL and LVAL signals are used as vertical and horizontal synchronization events. Their trailing (falling) edges are ignored. The DVAL can optionally be used as a DATA qualifier.
- FC-LA-DN and FC-LA-DG are the recommended configurations for cameras delivering images having a variable amount of fixed size lines. The FVAL signal is used as a "Frame Cover" signal that surrounds the lines to be acquired. The leading (rising) edge of the LVAL signal is used as a horizontal synchronization event. Its trailing edge is ignored. The DVAL can optionally be used as a DATA qualifier.
Configuring Enable Signals for Line-Scan Cameras
The following combinations of values of FvalMode-LvalMode-DvalMode are recommended for image acquisition from line-scan (Imaging=LINE) and TDI line-scan cameras (Imaging=TDI):
- FN-LA-DN and FN-LA-DG are the recommended configurations for capturing fixed size lines. The FVAL signal is ignored. The leading (rising) edge of the LVAL signals is used as a start-of-line synchronization events. The trailing (falling) edge of LVAL is ignored. The DVAL can optionally be used as a DATA qualifier.
Configuring Enable Signals for Raw Data Acquisition
The following combinations of values of FvalMode-LvalMode-DvalMode are recommended for raw data acquisition from digital devices:
- FC-LN-DN and FC-LN-DG are the recommended configurations for digital devices delivering raw data or camera devices delivering irregularly structured images. The FVAL signal is used as a "Frame Cover" signal that surrounds the data to be acquired. The LVAL signal is ignored. The DVAL can optionally be used as a DATA qualifier.