Description - Intermec EasyCoder 501 XP Service Manual

Chapter 12
12. Ribbon Low Sensor

12.1 Description

Ribbon Low Sensor
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As an option, the EasyCoder 501 XP can be fi tted with a sensor,
that detect the rotation of the ribbon supply hub and updates a
counter. By means of a custom-made application program, the
counter can be read and used to detect ribbon-low conditions (as
opposed to out-of-ribbon conditions, which are supported by the
standard error handling).
On the ribbon supply hub is a code disc with 41 gaps. When the
hub rotates, the photoelectric sensor detects when the light is inter-
rupted and decrements a counter. At startup, the counter is set to
a random value of approximately 65,000 and can be read using
SYSVAR(13), see Intermec Fingerprint v7.xx Reference Manual.
The sensor requires no regular cleaning. However, should any mal-
function be detected, blow the sensor clear from dust or media
residue before deciding to replace it.
The sensitivity of this sensor cannot be adjusted.
Code Disc
Intermec EasyCoder 501 XP – Service Manual Ed. 4