Microscan QX-830 User Manual page 229

Scanner Parameters
Service Unit
Allows the user to set up the output to toggle to active when the service timer has expired.
This condition will only be held for one service timer click.
Note: This feature cannot be used if the scanner is in Continuous Read.
When Service Unit is enabled, a message of up to 10 ASCII characters is sent whenever
the system detects that the service timer's limit has been reached. The service timer is
reset at power-on, meaning that the service timer's limit is the amount of time since last
reset. Service timer increments can be set in seconds or minutes.
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QX-830 Compact Industrial Scanner User's Manual