Citizen Systems CBM-750, CBM-720, CBM-730 manual Data Composition, Error Detection

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CBM-710/720/730/750 User ’s Manual

(2) Data Composition

[1]Start bit

[2]Data bits (and parity bit)

[3]Stop bit (1 bit or more)

[1]Start bit

1/2 bit past the line dropping from MARK to SPACE, a status reading is taken again. If the reading is SPACE, a start bit is recognized, but if it is MARK, it is not taken as a start bit. This is not regarded as an error, but the search for the start bit is performed once again.

[2]Data bit and Parity bit

Data bits and parity bits are the data of the bits in question, which are represented by the state at the times sampling is performed. This is accomplished at time intervals equal to one bit in length, beginning from the middle of the start bit. The order of the bits is, starting with the bit closest to the start bit, bit -0, bit-1 ....., pa rity bit. (Note: data bits are based on "one point sampling".)

[3]Stop bit

The stop bit consists of one or more bits at "mark" level. When "space" level is detected for a stop bit, a framing error occurs.

(3)Error Detection

Parity, framing and overrun errors can be detected by your printer. When an error is detected, the ALARM lamp goes on, the buzzer is sounded, the related data is abandoned, and the printer shifts to the next incoming data. The ALARM lamp can be turned off by pressing the LINE switc h.

[1]Framing error

When "space" state is detected during stop bit sampling, the ALARM lamp goes on, the buzzer sounds, and the related data is ignored.

[2]Parity error

When parity check is designated, and if when checked an error is detected, the ALARM lamp goes on, the buzzer sounds and the related data is ignored.

[3]Overrun error

When an overrun error is detected, the ALARM lamp goes on, the buzzer sounds and the related data is ignored.

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CITIZEN

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Contents Page Declaration of Conformity Important Safety Instructions Sicherheitshinweis Contents 11.1 Accessories FeaturesIntroduction Type Classifications CBM-710 23 RSpecifications General SpecificationsCBM-710 CBM-720 Paper Specifications Print FormatBlock Diagram External Appearance and Pars Descriptions CBM-710 External AppearanceCBM-720 External Appearance Front ViewCBM-730 External Appearance CBM-750 External Appearance Part Descriptions Setting and Removing the Paper and Ribbon Covers OperationOpening and Closing the Cutter Unit CBM-720. CBM-750 Installing the Cassette Ribbon Installing and Changing the Paper Installing the PaperCitizen Citizen Paper End Detector Procedures for Actuating the Self Print FunctionSelf Print Function Changing the PaperInstallation of the CBM-750 Input Buffer Back-up Input Buffer BACK-UP FunctionClearing the Input Buffer Connector Pin Assignment SpecificationsParallel Interface Description of Input/Output Signals Input/Output SignalsElectrical Characteristics Timing Chart Serial Interface DTR Description of Input/Output Signals Error Detection Data CompositionData Receiving Control BufferingOutput DTR, TD Ready Setting DIP Switch DS1 Function SelectionDIP Switch DS2 Serial interface specifications only Slide Switch Setting Serial interface specifications only DIP Switch and Slide Switch LocationsPrint Control Functions Control CodesEnlarged character command Input Data FormatsPrint command Enlarged character cancel commandPaper feed command Clear commandInverted character command Initial Set CommandBuzzer Command Underline Command Graphic Command Graphic Type Only14 2/9 inch Line Feed Pitch Set Command Graphic Type 13 1/9 inch Line Feed Pitch Set Command Graphic TypePin Form Feed Command Skip Perforation Cancel Command 2nd byte 4EH 3rd byte N7 N6 N5 N4 N3 N2 N1 Binary digitalFull Cut Command 1st byte Character Code Tables International Character CodesIndividual Country Character Codes Exterior MaintenanceMaintenance Procedures InteriorExternal Dimensions CBM-710CBM-720 Paper Winder Unit AW-2 CBM-730 CBM-750 Information Systems Division Head Office