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Theory of Operation Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 239
11.5.2. CENTRAL PROCESSING UNIT (CPU)
The CPU for the E-Series instruments is a low power (5 VDC, 360mA MAX), high performance, Vortex86SX-
based microcomputer running MS-DOS; its operation and assembly are compliant with the PC/104 Standard.
The CPU is installed on the motherboard located inside the rear panel. It supports both RS-232 and RS-485
serial I/O.
The CPU includes two types of non-volatile data storage: a Disk-on-Module and an embedded flash chip.
DISK-ON-MODULE (DOM)
While technically an EEPROM, the DOM,is a 44-pin IDE flash drive with a storage capacity up to 128 MB. It is
used to store the operating system for the computer, the Teledyne’s Firmware, and most of the operational data
generated by the analyzer’s internal data acquisition system (iDAS - See Section 7.1).
FLASH CHIP
Another, smaller EEPROM is the flash chip embedded in the CPU, which is used to store critical calibration and
configuration data. Storing these key data on a separate, less heavily accessed chip significantly decreases the
chance of the data being corrupted.
In the unlikely event that the flash chip should fail, the analyzer will continue to operate with just the DOM.
However, all configuration information will be lost, requiring the unit to be recalibrated.