| 摘要 |
1,199,148. Electric selective signalling. SHELL-MEX & B.P. Ltd. 7 Nov., 1967 [7 Nov., 1966], No. 49733/66. Heading G4H. In data collection apparatus, electrical input data signals on a plurality of input lines are routed in response to data signals on at least one of the lines to selected storage positions in a store whereby a data signal from a given source can be controlled to have differing significances depending on the storage position to which it is routed, the contents of the store being extracted as a block of electrical signals and coded for supply to a central station. A console for use in a selling organization has a plurality of keyboards for specifying transactions, customer group, product group, date, quantity, numerical quantities (including sterling) &c. Selection of a group causes a twodimensional matrix display of the group so that a number of the group (e.g. a customer) can be specified by co-ordinate selection using one keyboard twice. Similar co-ordinate selection is used for packing details, using a permanent display. Numerical quantities are shifted (as entered) into a shift register, with by-pass of certain stages in the case of sterling quantities, the register contents being displayed. The above types of information, in 1-out-of-n form, together with punctuation symbols, message serial number (from a counter), and station (i.e. console) number, are entered into a buffer store at positions depending on the type of the information. The stored information is gated two characters at a time via a coder to a serializer. The coder uses OR gates to convert from 1-out-of-n to pure binary and to add a parity bit to each 4-bit character resulting. Modulo sum check characters are also appended. Information items which were already in binary code by-pass the coder. The serializer serializes the characters to serial-bybit form and performs parity checks. In the absence of error, the information is passed to a computer, or if this is busy, to a paper tape punch, the tape being subsequently read into the computer. A console printer also receives the information A second buffer store and coder, operating like those mentioned above are provided for this except that the coder converts to ASCII code. Parity bits and modulo sum check characters are not used in this case, nor is a serializer. The computer can also print out on the console printer, having priority over the console for this. Some of the keyboards may use plug-in units of the type shown in Fig. 29 as the keys to provide coded signals directly. A selection of a 4 x 3 matrix of pins 602 in an insulating block 601 is connected by screws as shown to a metal plate 609. Depression of a tablet 605 connects the plate 609 to a power supply pin 603 via a plate 607. The tablet 605 is removable to allow the screws to be changed and thus the code altered. A keyboard consists of a plurality of the key units of Fig. 29 plugged into a block having three layers of printed circuits, each layer having four output leads connected to respective corresponding pins 602 in each key unit. The printed circuits also include connections to the power supply pins 603 and earth pins (not shown in Fig. 29). The 12-bit code resulting from pressing one key is partially serialized by gates and adjoined to bits identifying the keyboard, to form a series of four 5-bit bytes, which are treated like the outputs of the coders in the main embodiment.
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