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Appendix B—Serial Communication Technical Details
B.9
Photon User’s Manual
Frame Synchronization
Note
The external sync signal, or trigger, can only be applied via the Samtec 30-Pin Connector.
The external sync signal is not brought out to the 15-pin D-Sub connector.
B.9.1 Slave Mode
The camera will accept a frame synchronization signal on the interface connector (DIS0; pin
26) when configured as a slave via the serial communications port. The sync signal starts the
FPA frame timing sequence. The sync signal consists of a positive going, 3 volt pulse as defined
in Table B-6. The frame sync signal should be sent only once per frame and the camera core
will not output digital data until a valid frame sync is received. The video output (analog) of the
camera core is enabled while in external sync mode, however, the video frame rate depends
upon the external frame sync rate (e.g. the analog video may not conform to timing standards).
The camera synchronization state must be set prior to power-up (e.g. after the mode is
changed and saved, the camera must be re-started).
Table B-6: Frame Sync Input Requirements
Frequency Range
Output Frame rate
Pulse width (minimum)
NTSC full frame rate
0 to 30 Hz
0 to 30Hz
135ns
NTSC slow frame rate
0 to 30 Hz
0 to 7.5Hz
135ns
PAL full frame rate
0 to 25 Hz
0 to 25Hz
135ns
PAL slow frame rate
0 to 25 Hz
0 to 6.2Hz
135ns
B.9.2 Master Mode
The camera will output a frame synchronization signal on the interface connector (DIS0; pin 26)
when configured as a master via the serial communications port. The sync signal corresponds
to the start of the FPA frame timing sequence. The sync signal shall consist of a positive going,
3 volt pulse as defined in Table B-7. The frame sync signal shall occur only once per frame. This
signal output is intended to drive one Photon which is configured for slave mode operation.
Table B-7: Frame Sync Output Requirements
Frequency Range
NTSC full frame rate
B-14
Pulse width (minimum)
29.97 Hz
200ns
NTSC slow frame rate
7.5 Hz
200ns
PAL full frame rate
25 Hz
200ns
PAL slow frame rate
8.3 Hz
200ns
February 2008
412-0035-00-10, version 110