Instruction manual

Guppy Technical ManualV7.4.0
70
Camera interfaces
Pixel data
Pixel data are transmitted as isochronous data packets in accordance with the
1394 interface described in IIDC V1.3. The first packet of a frame is identified by
the 1 in the sync bit (sy) of the packet header.
Note

The signals can be inverted.
Caution

Firing a new trigger while IntEna is still active can result in
missing image.
Note

• Trigger delay in fact delays the image capture whereas
the IntEna_Delay only delays the leading edge of the
IntEna output signal but does not delay the image cap-
ture.
• As mentioned before, it is possible to set the outputs by
software. Doing so, the achievable maximum frequency is
strongly dependent on individual software capabilities.
As a rule of thumb, the camera itself will limit the toggle
frequency to not more than 700 Hz.
0-7 8-15 16-23 24-31
data_length tg channel tCode sy
header_CRC
Video data payload
data_CRC
Table 26: Isochronous data block packet format. Source: IIDC V1.3
sync bit