MTS Systems TFIR-31LAN series, Operation Manual

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4 Configuration for symbol reading
4.1 Configuration parameters
The following parameters are set to get decodable images:
(1) Decode area [DDMwindow]
(2) Illumination control [DDMlight]
(3) Internal illumination [DDMled]
(4) Illumination intensity [DDMbrightness]
(5) Shutter speed [DDMshutt]
(6) Extra gain value [DDMexgain]
(7) Black level adjustment [DDMblack]
(8) Image preprocessing [DDMpreproc]
(9) Mirrored symbol [DDMmirror]
4.1.1 Decode area
(1) Decode area
[DDMwindow]
Decode area is used to specify the the area of the image to be decoded
(Shown below). Smaller decode area can lead to a faster decoding speed, but
smaller areas may make it difficult to position the symbol within the smaller
decode area.
Horizontal: 100%
(752) 75% (564) 50% (376) 25% (188)
Vertical: 100% (480) 75% (360) 50% (240) 25% (120)
DDMwindow=a,b (a, b=0,1,2,3 0:100%,1:75%,2:50%,3:25%)
a: for Horizontal, b: for Vertical
Generally, a smaller reading area will lead to a shorter decode time. However if
the reading area is too small, the reading ratio could be decreased due to the
smaller margin between code size and the decoding window size.
Sketch of decode area
100%
75%
50%
25%