1994-11-01
1996-04-30
Beausoliel, Jr., Robert W.
G06F 700
Patent
active
055133479
DESCRIPTION:
BRIEF SUMMARY
This application is a continuation under 35 USC 371(c) of international application number PCT/JP88/00378, filed Apr. 15, 1988, designating the United States.
TECHNICAL FIELD
The present invention relates to a data transfer system for use in transferring digital data between one controller and another controller, and, more particularly, to a data transfer system capable of transferring a parity code in distinction from a transfer control code.
BACKGROUND ART
For instance, in sending and collecting measured data obtained by a portable measuring unit at a host system located remote from this measuring unit, the measured data needs to be transferred as accurately as possible to the host system from the measuring unit. As an example of a system for transferring measured data obtained by a measuring unit to a host system in this manner, there is proposed a system as illustrated in FIG. 3.
A measuring unit 1 measures physical quantities such as the weight and length of an object to be measured. Measured data consisting of analog values measured by this measuring unit 1 is converted by an A/D (analog-digital) converter 2 to be measured data consisting of digital values. This digital measured data is input to a controller 3 which may be constituted by a microcomputer. The controller 3 puts the input digital measured data into a predetermined data frame for transmission, i.e., a transfer frame, to prepare transfer data, subjects this transfer data to frequency shift keying (FSK), and supplies it to a transmitter 4. The transmitter 4 radiotransmits a frequency modulation signal of an FSK signal of the above transfer data. The transmitted frequency modulation signal is received by a receiver 6 provided in a host system 5, and is demodulated into the original transfer data, i.e., transfer frame. The demodulated transfer frame is input to a host computer 7. The host computer 7 extracts measured data included in the input transfer frame and executes various data processes using the measured data.
In this case, data that should be transferred to the host system 5 on a receiver side from the controller 3 on a sender side includes (1) an ID (identification) number for specifying the measuring unit 1, (2) numerical data as measured data, and (3) a carriage return command (CR: carriage return) and (4) paper feed (line feed) command (LF: line feed) which are control data in consideration of a case where a printer is connected to the host system 5, as shown in FIG. 4.
In transferring these data, if numerical data ((2)) expressed in, for example, binary is put as it is in a transfer frame, it may be confused with other transfer control codes. Therefore, the numerical data ((2)) is converted into a character code representing the numeral before being put in the transfer frame. In general, a JIS character code or an ISO character code (the JIS character code is common to the ISO character code for alphanumeric codes and most control characters) standardized by JIS or ISO is used as a character code in this case. This conversion from character data into a character code is executed using a conversion table or the like stored in a memory in advance. More specifically, in the example in FIG. 4, the ID number ((1)) is "3" and it is converted into a JIS character code "00110011" (33 H) (H indicating hexadecimal) which represents "3." The numerical data ((2)) is "236.8," and for each of the characters "2," "3," "6," "." and "8," it is converted into an associated 8-bit character code. "CR" and "LF" as transfer control codes are respectively converted into control characters "00001101" (0D H) and "00001010" (0A H).
FIG. 5 illustrates the data structure of a transfer frame 8 in which the aforementioned various data ((1)-(4)) are included. A header is set at the head of the transfer frame 8, a predetermined start code STX "00000010" (02 H) indicating the start of the transfer frame 8 is set following this header, followed by a character code "3" indicating the ID number and individual character codes, "2," "3," "6," "." and "8," ind
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Okuyama Toshiharu
Shimizu Giichiro
Shimizu Misao
Takeuchi Hajime
Wakatsuki Yoshio
Beausoliel, Jr. Robert W.
Elmore Stephen
Man Design Co. Ltd.
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