Printronix SL5000r RFID Smart Label and Thermal Printers - Manual (Page 78)

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Chapter 2 Printing Adjustments
To avoid this problem, increase the Threshold Range value to 60% in the
CALIBRATE CTRL menu (the default is 50%), then run an Auto Calibrate
again (Cross-ref to Auto Calibrate).
NOTE: Any changes to Threshold Range will not take effect until you run an
Auto Calibrate again.
This will raise the Gap/Mark threshold high enough so that the printer will not
falsely use the antenna or noise as the gap (top-of-form).
255
191
127
063
000
Paper Out(075)
Gap(040)
Detected Amplitude
of the Antenna
Detected Amplitude
of the Gap
Media Sensor
Position FEED
Indicates Type of Gap/Mark
Sensing Selected