Hengstler eXtendo X-56 Operating Manual page 29

eXtendo® Thermal Printer Family
The center position 1-2 for X-56 and 3-8 for X-80 can be employed for a through-beam sensor. See
3.6.1 Paper Entrance / Black Mark Sensor.
also section
Default BM sensor locations:
X-56 BM sensor 6
X-80 BM sensor 10
Please note that sensor locations other than the default location are intended for OEM applications.

In order to avoid accidental interpretation of preprinted information as the black mark, it's
necessary to keep the area 5 mm to the left and right of the BM edges for the entire length of the
printout free of all printing except Pantone Safety Colors with a print contrast (PCS) value of under
15%, as measured by MacBeth RD924. The BM itself must have a print contrast over 80%, per
DIN 66223, measured with MacBeth PCM2, Filter B. This applied to the side of the printout where
the BM is located, regardless of whether it is the thermal-coated side or not. The blue area in Fig. 13
shows this zone for the default sensor position 6 of the X-56.
Part No. D-684-124
(bottom side)
(bottom side)
Mod. No. 4 270919 HW1 page 29 of 33