valutazioni - 5, GPA: 3.8
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[4] The assignment of RS-232C/Current loop/TTL can be performed with the preset jumper (Refer to 10. Slide Switch Setting). Compatible Connector (D-Sub connector) : *Printer: 17LE-13 250 (AMPHENOL or equivalent) *Cable Side: 17JE-23 250 (AMPNENOL or equivalent) 26 CITIZEN CBM-710/720/730/750 User’s Manual 9.3 Description of Input/Output Signals (1) Input/Output Signals a) RD : This is the serial signal for received data. When framing, overrun or parity errors occur, the data concerned are ignored. b) DTR: Please write in data or commands when this signal is in a "ready" state. If written in when in a BUSY state, an overrun error will occur and the data will be ignored. Data can be written into the input buffer even during printing. Further, a BUSY signal is gene rated when the power is turned on, while test printing, when ONLINEE and during reset. c) FAULT : When there is a problem in the printer mechanism the FAULT signal will be issued, and all control circuits will be interrupted. To RESET this signal, first correct the cause of trouble in the printer mechanism. Then, by pressing the LINE switch or by inputting "0" (LOW LEVEL) at the RESET terminal, the FAULT can be cleared. Causes of the FAULT signal are lack of paper and errors in the printer mechanism. Printer errors include such as, the print head stopping during print operation or failure of the print head to return to the home position. d) RESET: This signal resets the entire printer. e) PE : This signal is output when the paper roll is near the end. f) TD (Valid only for type B): When receiving data signals, and when the printer's input buffer has less than 1K bytes remaining open, the DC3 code (13H) is issued, indicating that receipt of data is not possible. When the data in the input buffer is reduced to 2K bytes, the DC1 (11H) code is issued, which indicates that data receipt is possible. g) FG: Frame Ground h) GND: Common ground for all circuits. 27 CITIZEN 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. 28 CITIZEN CBM-710/720/730/750 User’s Manual [4] Other errors When trouble is detected in the printer mechanism, the ALARM lamp goes on, the buzzer is sounded, the FAULT signal is output, and the DTR signal becomes BUSY. After the cause of the trouble has been corrected, the ALARM lamp canbe turnedoff by pressing the LINE switchor by makingRESET = "0".Whenthe printer is put ONLINE, data receiving restarts. (4) Data Receiving Control When the BUSY signal is LOW, your printer receives data from the host side, but when this signal is HIGH, it cannot receive data. (5) Buffering Data transfer to the input buffer is controlled by the DTR and TD signals. Please refer to 9.3 b) for the DTR signal and 9.3 f) for the TD signal. 29 CITIZEN CBM-710/720/730/750 User’s Manual (6) Electrical Characteristics a) RS-232C Circuit Input (RD) MAX232 or equivalent Mark = (-8V): Stop bit Space = (-8V): Start bit Output (DTR, TD, FAULT) MAX232 or equivalent *DTR (–8V): (+8V): *FAULT (–8V): (+8V): BUSY READY Normal Abnormal *TD Mark = (–8V): 1 Space = (+8V): 1 30 CITIZEN CBM-710/720/730/750 User’s Manual b) Current Loop Circuit Input (RD) Mark = Current ON Space = Current OFF Output (DTR, TD) *DTR Current ON : READY Current OFF : BUSY *TD Mark = Current ON Space = Current OFF c) TTL Circuit Output...
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