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Principles of Operation Teledyne API T801 NDIR CO2 Analyzer Operation Manual
210
Figure 12-6. CPU Card
The CPU includes two types of non-volatile data storage: an embedded 2MB
flash chip and a Disk on Module (DOM).
12.5.2.1. DISK-ON-MODULE (DOM)
The DOM is a 44-pin IDE flash disk with a storage capacity up to 128MB. It is
used to store the computer’s operating system, the Teledyne API firmware, and
most of the operational data generated by the analyzer’s internal data acquisition
system (DAS – Section 7). The LEDs on the DOM indicate power and
reading/writing to or from
the DOM.
12.5.3. RELAY BOARD
The CPU issues commands via a series of relays and switches located on a
separate printed circuit assembly, called the relay PCA, to control the function of
key electromechanical devices such as heaters. The relay PCA receives
instructions in the form of digital signals over the I
2
C bus, interprets these digital
instructions and activates its various switches and relays appropriately.
The relay PCA is located in the right-rear quadrant of the analyzer and is
mounted vertically on the backside of the same bracket as the instrument’s DC
power supplies.
07274B DCN6418