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The desk units would set up the ticker symbol code for the desired stock by mechanical means actuating micro switches. The local control box would continuously interrogate each desk unit in sequence and send a request data packet by Dataphone to the local drum memory which would then send return data packets back to the local brokerage office.
Symbol Technologies, Inc., was an American manufacturer and supplier of mobile data capture and delivery equipment.The company specialized in barcode scanners, mobile computers, RFID systems and Wireless LAN infrastructure.
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VueScan is intended to work with a large number of image scanners, excluding specialised professional scanners such as drum scanners, on many computer operating systems (OS), even if drivers for the scanner are not available for the OS. These scanners are supplied with device drivers and software to operate them, included in their price.
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In directed (or inverse) scanning, the indicator will only scan in the preset pattern when the user holds down a switch. Selections are made when the switch is released. [2] [9] In automatic (regular or interrupted) scanning, the indicator scans in the preset pattern on its own and item selection occurs when the scanner hits a switch. [5] [7]
Another type, scan based trunked systems, (not shown) do not have a control channel. Frequencies are for discussion purposes and do not correspond to any specific system. A trunked radio system is a two-way radio system that uses a control channel to automatically assign frequency channels to groups of user radios.