Paper Low Detection

The Paper Low Sensor detects when the remaining paper length is only 40 ft. Depending on the diagnostic form setting, the firmware counts the paper length to report the Paper low warning status.

Paper low sensor status—updated based on the paper low sensor detection when the remaining paper length is 40 ft.
Paper low warning status—updated based on the “Paper Low Detection” setting in the Diagnostic form.

Series i

Receipt Direction	Paper Low Detection (Remaining ft)	Firmware count (Sensor level – Diag setting)	Paper low warning update in Power Off/On state
Front Exit	40 ft	0	Immediate
	30 ft	10 ft	Not immediate
	20 ft	20 ft	Not immediate
	15 ft (default)	25 ft (40 to 15 ft)	Not immediate
Top Exit	40 ft	0	Not immediate
	30 ft	0	Not immediate
	20 ft	10 ft	Not immediate
	15 ft (default)	15 ft (30 to 15 ft)	Not immediate

Series ii

Paper Low Detection (Remaining ft)	Firmware count (Sensor level – Diag setting)	Paper low warning update in Power Off/On state
40 ft	0	Immediate
30 ft	10 ft	Not immediate
20 ft	20 ft	Not immediate
15 ft (default)	25 ft (40 to 15 ft)	Not immediate

Note

Receipt direction setting is not applicable for Series ii. Both receipt top exit and front exit are using common criteria as above table.

Note

Take note of the following:

When the printer is in power off/on or receipt cover open/close state and if the loaded paper does not cover the paper low sensor, the printer immediately detects paper low warning as it starts printing.
For Series ii, printer does not support receipt direction setting. Refer to firmware count conditions of “Front Exit” only for horizontal or vertical mount.
In the Top Exit receipt direction, the paper low sensor can detect when there is only 30 ft of paper remaining. This means that the paper low detection length is the same (at 30 ft) for both "Enable (Remaining 40ft)" and "Enable (Remaining 30ft)". After paper low sensor detection, the printer needs to print a minimum of 3 ft to detect the stable paper low. The same logic applies to printer power off and on condition that if a small paper roll is loaded and it does not cover the paper low sensor, the printer cannot immediately detect paper low warning. The printer need to print a minimum of 3 ft to detect paper low.

Paper Low Detection Process

The following table provides the process of detecting paper low in different printer settings.

Step	Paper Low Detection Setting
Step	Remaining 15ft (default), 20ft, 30ft	Remaining 40ft
1	The user load a full paper roll in receipt station and starts printing. Note The paper roll should cover the paper low sensor.	The user load a full paper roll in receipt station and starts printing. Note The paper roll should cover the paper low sensor.
2	When the firmware detects paper low at 40 ft, the firmware saves this in the Flash ROM.	When the firmware detects paper low at 40 ft, the firmware saves this in the Flash ROM and the printer status is set as paper low.
3	The printer prints the receipt, and the firmware start to count the paper feed length.	The printer prints the receipt, and the firmware start to count the paper feed length.
4	When the paper feed reaches the next 5 ft (that is, remaining 35 ft, 30 ft, 25 ft, 20 ft, 15 ft), the firmware saves this in the Flash ROM. Note If the printer is turned off and then on, the firmware does not retrieve the latest stored value. For example, if the printer is turned off after printing 2 ft of paper, the 2‑ft count is lost after the printer is turned back on again.	When the paper feed reaches the next 5 ft (that is, remaining 35 ft, 30 ft, 25 ft, 20 ft, 15 ft), the firmware saves this in the Flash ROM. Note If the printer is turned off and then on, the firmware does not retrieve the latest stored value. For example, if the printer is turned off after printing 2 ft of paper, the 2‑ft count is lost after the printer is turned back on again.
	Steps 3 and 4 continue until the configured paper low detection setting is reached. At 15 ft remaining, the printer status is set as paper low. At 10 ft remaining, the printer switches to Receipt Sync Mode 1 for effective paper end detection.	Steps 3 and 4 continue until the remaining 10 ft is reached. At 10 ft remaining, the printer switches to Receipt Sync Mode 1 for effective paper end detection.

Note

Receipt Sync Mode 1 is effective both in Paper low detection enable and disable. To check functionality related to paper low, use the larger paper roll that covers the paper roll sensor.