Citizen Systems PD-04 - Manual (Page 37)

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Connecting with an Infrared Optical
Communication Device
[When using the optical communication system both the PC and printer should be
placed so that the receptors are directly facing each other.
[The PC and printer should be placed within 20 to 80 centimeters of each other.
[Make sure that there is nothing covering or screening the area between the printer
and your PC, as data transmission will be interrupted.