x Table of Contents 083730300A DCN8101
6.4.2.4 IR Photo-Detector ............................................................................................................156
6.4.3 Synchronous Demodulator (Sync/Demod) Assembly ....................................................................156
6.4.3.1 Signal Synchronization and Demodulation......................................................................157
6.4.3.2 Sync/Demod Status LEDs ...............................................................................................158
6.4.3.3 Photo-Detector Temperature Control ..............................................................................159
6.4.3.4 Dark Calibration Switch ...................................................................................................159
6.4.4 Relay Board ...................................................................................................................................159
6.4.4.1 Heater Control .................................................................................................................159
6.4.4.2 GFC Wheel Motor Control ...............................................................................................159
6.4.4.3 Zero/Span Valve Options ................................................................................................159
6.4.4.4 IR Source .........................................................................................................................160
6.4.4.5 I2C Watch Dog Circuitry ..................................................................................................161
6.4.5 MotherBoard ..................................................................................................................................161
6.4.5.1 A to D Conversion ...........................................................................................................161
6.4.5.2 Sensor Inputs ..................................................................................................................161
6.4.5.3 Thermistor Interface ........................................................................................................162
6.4.5.4 Analog Outputs ................................................................................................................162
6.4.5.5 Internal Digital I/O ............................................................................................................162
6.4.5.6 External Digital I/O ...........................................................................................................163
6.4.6 I
2
C Data Bus ...................................................................................................................................163
6.4.7 Power Supply/ Circuit Breaker .......................................................................................................163
6.4.8 Front Panel Touchscreen/Display Interface ...................................................................................165
6.4.8.1 LVDS Transmitter Board .................................................................................................165
6.4.8.2 Front Panel Touchscreen/Display Interface PCA ............................................................165
6.5 Software Operation ....................................................................................................................................166
6.5.1 Adaptive Filter ................................................................................................................................166
6.5.2 Calibration - Slope and Offset ........................................................................................................167
6.5.3 Measurement Algorithm .................................................................................................................167
6.5.4 Temperature and Pressure Compensation ....................................................................................167
Appendix A – MODBUS Registers
Appendix B – Interconnect Diagram
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