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Anatomy of a Robot Part 7

Tham khảo tài liệu 'anatomy of a robot part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 106 CHAPTER THREE Universal Serial Bus USB USB is a serial standard using a thin cable that is capable of transfers at around 1.5 MBps. It s well known in the PC industry and enables peripherals to be plugged in and out of the computer quickly even with the power turned on. For robots a USB might be an easy way to hook into another computer for communication or downloading. Many portable PCs support this standard and could be brought up to the robot to service it. For more info go to www.quatech.com Application_Objects FAQs comm-over-usb.htm. Firewire IEEE1394 The Firewire standard is generally used in systems requiring a great deal of media data audio or video . Cameras and other media devices connect together using thin hot-patch serial cables. Audio and video can be transferred in real time without interruptions between devices. One peculiarity of media streams is that they cannot be interrupted without a noticeable degradation of the transmission. If an interruption occurs in a digital video stream for example blocks can be seen on the screen. The Firewire protocol is designed to guarantee the delivery of media data across the timeshared wire. If the robot must transfer video or audio data Firewire might be a good candidate for those transmissions. Broadcast video requires a transmission bandwidth of around 15 to 34 MBps. Firewire can handle around 50 MBps to accommodate multiple transmission streams and faster versions are planned. For further info go to www.interfacebus.com Design_Connector_Firewire.html. Controller area network CAN The CAN bus is a serial bus standard designed for use in electrically noisy environments such as automobiles and industrial sites. It can transfer data at up to 125 KBps over cables from 40 to 1 000 meters long depending on data rates . Its other major advantage is that it saves wiring cost an important consideration when making thousands of automobiles. If the robot generates a great deal of electrical noise from its motors then