^JT – Head Test Interval

What ^JT does

^JT is part of the Printer and Media Control reference. Use it when working with head test interval on compatible Zebra printers. This independent reference focuses on the command shape, configuration inputs, defaults, and the surrounding commands that are commonly used with it.

Syntax

^JT####,a,b,c

Parameter quick reference

• Values: 0000 to 9999
• Default: 0000 (off)
• a = manually select
• Values:
• N = no
• Y = yes
• b = first element to
• Values: 0 to 9999
• c = last element to
• Values: 0 to 9999

Implementation guidance

• Confirm that the printer model and firmware support the command before deployment.
• Test the smallest valid command first, then add optional parameters one at a time.
• Keep units in printer dots unless the command explicitly defines another unit.
• Verify the result on the target media, because resolution, orientation, and stored settings can change the output.

Troubleshooting

If the printer ignores the instruction, check the command prefix, delimiter characters, firmware support, and whether the command belongs inside a ^XA and ^XZ format. For output commands, also confirm that the field is closed with ^FS where required.

Source note

This independently written page was checked against the Zebra programming guide revision supplied for this project (reference page 277). Zebra, ZPL, and related product names are trademarks of their respective owners.