ABL77 Service Manual
Chapter 2: Analyzer Description
Module Descriptions,
Continued
Electronics Boards
Analog board
The analog board (REF: 902-682) contains a microprocessor and custom
algorithms that control valve, motor, and sensor operations (see Figure 2-21). The
onboard processor performs various operations such as thermistor control, roller
pump motor control, and sensor signal A to D conversions. This remote
intelligence enables the main computer to focus primarily on the operator interface.
Commands are received from the main computer to turn on valves, motors, begin
sensor heating cycle, etc. The analog board returns a character string once a second
to the main computer that contains the output states and sensor characteristics.
Figure 2-21
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Rev. F
2-35
