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The Ethernet ports can be used for local or remote connection via the web-based GUI program.
One USB port is used for communication with the Input / Output (IO) board. The other USB ports
can be used to download the archive data from the on-board storage.
2.2.2 Display Board
The AccuLase-GPA™ display board is the electronics board that includes the analyzer’s 7-inch full
color liquid crystal display (LCD), shown in Figure 2.
Figure 2: AccuLase-GPA™ Display
The LCD is used to display the analyzer’s local user interface, which displays analysis results and a
variety of other analyzer parameters, and can also be used to make some changes to the analyzer
configuration. The local display can be manipulated using the analyzer’s hand-held keypad. The
operation of the local user interface is described in Section 3 of this manual.
Above the display are three status LEDs which are used to indicate various aspects of the analyzer
status. The function of these LEDs is described in Section 3.2.
2.2.3 Input / Output Board
The Input / Output (IO) board is mounted inside the electronics enclosure. The interior of the
electronics enclosure of the AccuLase-GPA™ D1 model.
The IO board handles all of the analyzer’s inputs and outputs. Inputs to the IO board include the
data from the laser control module from the analyzer’s optics/sample cell enclosure, the sample
cell temperature and pressure transducer inputs, and inputs from the analyzer’s hand held keypad.
Outputs from the IO board include 4-20mA analog outputs (up to 4, one per sample stream) for
analysis data, mechanical relays (4) for status outputs, a solid state relay for PID control of the
sample cell temperature, serial (RS-485) communication for MODBUS, and 8 solenoid controllers
for sample stream switching. The IO board communicates with the analyzer’s controller board via
a USB connection.
