RRD is the Acronym for Round Robin Database. RRD is a system to store and display time-series data (i.e. network bandwidth, machine-room temperature, server load average). It stores the data in a very compact way that will not expand over time, and it presents useful graphs by processing the data to enforce a certain data density. It can be used either via simple wrapper scripts (from shell or Perl) or via frontends that poll network devices and put a friendly user interface on it.
Right-click on , go to Properties , and check the Details tab.
If the specific installer is unavailable, download the ESC/POS Thermal Printer Driver which acts as a generic but highly effective driver.
USB (PRJ80US) or USB & Ethernet (PRJ80USE) Command Set: Fully compatible with ESC/POS commands
[Extract ZIP] ➔ [Run Setup File] ➔ [Select Language] ➔ [Set USB Port] ➔ [Apply & Test]
Right-click the .pkg file and select Open . If macOS displays an "untrusted developer" security message, head to System Preferences > Security & Privacy and click Open Anyway .