Instruction manual

Guppy Technical ManualV7.4.0

Camera interfaces

• The video data for each pixel are output in 8-bit format (Packed 12-Bit

Mode: 12-bit format). Exception: Guppy F-146 (Mono8: 8-bit format,

Mono12/16: 12-bit format)

• Each pixel has a range of 256 (Packed 12-Bit Mode: 4096) shades of gray.

• The digital value 0 is black and 255 (Packed 12-Bit Mode: 4095) is white.

• In 12-bit mode the data output is MSB aligned (12 significant bits).

• In 16-bit mode the data output is MSB aligned (also 12 significant bits).

Video data formats (IIDC V1.3 and Allied Vision)

The following tables provide a description of the video data format for the differ-

ent modes:

Y (Mono) and Y (Mono16) format 

Source: IIDC V1.3 specification

Y (Mono12) format 

Allied Vision own format (Packed 12-Bit Mode)

Field Description

data_length Number of bytes in the data field

tg Tag field

shall be set to zero

channel Isochronous channel number, as programmed in the iso_channel field

of the cam_sta_ctrl register

tCode Transaction code

shall be set to the isochronous data block packet tCode

sy Synchronization value (sync bit)

This is one single bit. It indicates the start of a new frame.

It shall be set to 0001h on the first isochronous data block of a frame,

and shall be set to zero on all other isochronous blocks

Video data payload Shall contain the digital video information

Table 27: Description of data block packet format

Y-(K+0) Y-(K+1) Y-(K+2) Y-(K+3)

Y-(K+4) Y-(K+5) Y-(K+6) Y-(K+7)

Figure 33: Y8 format [Source: IIDC V1.3]