HVAC Control in the New Millennium.pdf - HVAC.Amickracing

HVAC Control in the New MillenniumOther Single-board ComputersAnother single-board computer uses an AMD K6-3 500-MHz processor,high-performance Ultra2 SCSI, 10/100Base-T Ethernet, and 4 MBof AGP video. The board supports voltage and software watchdogs, aprocessor thermometer and an internal fan-speed monitor. Standard interfacesinclude two USB ports, two serial ports, keyboard and mouseports.Rugged ComputersRugged single-board computers incorporate the 400-MHzMotorola MPC7400 PowerPC processor. An extensive memory bandwidthis possible with an 83.3-MHz memory bus that yields sustainablememory transfer rates of 190 MBps and 296 MBps. Also included iscache support, flash capacity and 100Base-T Ethernet support for industrialapplications.All-weather workstations are available with 400-MHz CPUs. Oneunit has a 12.1-inch, sunlight-readable TFT display, four ISA PCI slots anda detachable keyboard and mouse. These workstations can be used inharsh environments that include rain, dust, and extreme temperatureranges.The unit also includes a shock-mounted, 8-GB hard drive, a floppydrive and AC, DC, or battery power. A touchscreen, a solid-state drive,a PCMCIA CD drive and Ethernet are also available. The unit’s shockmountedinternal parts can withstand high shock and vibration levelsand it may be carried around or mounted on a panel or rack.Other industrial computer trends include Pentium MMX-class processorswith VGA-LCD interfaces, audio, 10/100Base-T Ethernet andCompactFlash card. Up to 64 MB of RAM are available. Low powerconsumption allows a smaller, fanless design.A bundled Windows CE operating system, a parallel port, twoserial ports, two USB connectors, keyboard connector and infrared portare included.Pentium-based single board computers with 100-MHz bus clockshave up to 128 MB FPM/EDO (fast page mode/extended data output),512 kB standard L2 cache memory and a socket for a Flash memory disk(DiskOnChip) of up to 72 MB. Also included are two RS-232 serial ports,©2001 by The Fairmont Press, Inc. All rights reserved.