QTERM-G75 Terminal Installing to NEMA-4 Specifications
Qlarity-Based Terminal Hardware 25
2.3.5 Real-Time Clock
The QTERM-G75 terminal is equipped with a battery-backed, real-time clock. The real-time
clock can be used to time/date stamp messages or for timed polling and program execution.
2.3.6 System Memory
The QTERM-G75 terminal stores the firmware and user applications in a compressed format
in flash memory and then transfers them to RAM memory when the terminal is powered on.
Eight megabytes of flash memory and 32 megabytes of RAM memory are included on the
standard unit. The PoE unit has four megabytes of flash memory and sixteen megabytes of
RAM memory.
For information on using resources efficiently to conserve memory when creating a user appli-
cation, refer to “Edit Resources” section in the Qlarity Foundry User Guide.
For information on downloading new firmware, downloading a user application, and determin-
ing the size of a user application, refer to the Qlarity Foundry User Guide.
2.3.7 Watchdog Timer
A watchdog timer can be optionally added to enforce proper operation of the QTERM-G75.
The watchdog timer will reset the terminal if there is a problem causing the firmware to lock
up. This does not apply to software deadlocks in the Qlarity code. If that is required, then the
Qlarity watchdog timer should be used, using the WatchdogEnable and WatchdogReset APIs.
2.4 Installing to NEMA-4 Specifications
A QTERM-G75 terminal uses a rugged aluminum case designed to mount into a panel. When
properly installed in a NEMA-4 rated panel, the QTERM-G75 meets all NEMA-4 specifica-
tions including hose-down, icing, and salt spray.
A QTERM-G75 terminal can be installed with either landscape or portrait orientation. When
installing a terminal, you generally take the following steps.
• Decide whether you want to mount and use the terminal in portrait or landscape orientation.
“Portrait” means that the longest dimension is vertical; “landscape” means that the longest
dimension is horizontal.
WARNING
There may be danger of leakage if the battery is incorrectly replaced, creating a potential
health hazard. Replace the battery only with the same (CR1220) or equivalent type as recom-
mended by the manufacturer. Dispose of used batteries according to the manufacturer’s
instructions.
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