Sharp IV-C35M User Manual

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Contents

22-5Communication (General Purpose Serial Interface)2222-3 Communication formatThe communication formats of the commands and responses between the IV-C35M and a personalcomputer are outlined below.*1 Station No.: 00 to 7F (H)*2 Processing code and text- They depend on the contents of communication. - See pages 22-1, 22-2 to 22-17.- On abnormal termination, no text is provided.*3 Termination code (H)The termination code is a 2-digit hexadecimal number.- When an output is sent through the general purpose serial I/F, 00 (H) is sent on normaltermination.- On abnormal termination, a code other than 00 (H) is sent. - See page 24-3.*4 Checksum code (SC H and SCL)To improve the reliability of the transmitted data, in addition to a parity check, error detection by achecksum is used for error detection.When the IV-C35M does not need to complete a checksum for error detection, use an @ (at sign:ASCII code 40 (H) ) in each of the checksum codes SC H and SCL included in the command.[Error detection using a checksum]The ASCII code for each data byte, from the processing code to the end of text (prior to thechecksum code), is added. The final value is compared to the checksum code which is treated thesame way. If the two values are identical, the command is considered to be valid. I/F they are notidentical, an error has occurred during transmission.Header HeaderSCH CRSCLRCH RCLTextTerminationcode TerminatorProcessing code Checksum codeValue increment rangefor checksumSCH SCL CRChecksum codeTerminatorTextProcessingcodeValue increment rangefor checksumCommandResponseCommandResponse...............HeaderSCH SCL CRChecksum codeTerminatorTextHeaderSCLRCH RCLText*4*2Processingcode*2Terminationcode*2*3Terminator*2Processing code*4Checksum codeSCH CRStationNo.*1StationNo.StationNo.:*1StationNo.: ...............StationNo.:StationNo.StationNo.:StationNo.