valutazioni - 3, GPA: 3.3
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Facilità d'uso
For LED ERROR , there is a resister of 330 Ohm on the circuit side to make current value 10 mA. Please use LED which its voltage is approx. 2V. LED over 10 mA may break a control board. 2. Make sure to supply power to all pins of power supply for circuit and power supply for operation to keep required current capacity. 3. Serial interface equips a driver and receiver of RS-232C, make sure to use it at RS-232C level. 4. RESET terminal is pulled up by 3.3K Ohm. Make sue to make this terminal NC, when this terminal is not used. 5. Absolutely, do not carry use No.19, No.21 and No.40 pins. Since they are used for printer main unit. In case they are used, they may cause abnormality or break control board. 6. Parallel Interface 6.1 Specifications Data input method : 8 bit parallel signal (DATA0 ~ 7) Control signals : ACK, BUSY, STB, FAULT, PE, RESET 6.2 Explanation of input / output signals DATA0 ~ 7 : 8 bit parallel signal (Positive logic) STB : Strobe signal to read 8 bit data (Positive signal) RESET : Signal to reset control board ACK : 8 bit data request signal. Pulse signal output at the end of the BUSY signal (Negative logic) BUSY : Signal to indicate BUSY state of the printer.Input new data for "LOW" (Positive logic) FAULT : Signal which is made "LOW" when printer is in alarm state.(Negative logic) PE : Signal which is output when paper runs out.(Positive logic) 16 CITIZEN CBM-290/291 User’s Manual 6.3 Electrical characteristics (1) Input Signal Level All the input signals are at TTL level. "HIGH" level : 0.7Vcc MIN "LOW" level : 0.3Vcc MAX (2) Output Signal Level All the input signals are at TTL level. "HIGH" level : Vcc – 0.1V MIN "LOW" level : 0.1V MAX (3) I/O Conditions Input signal of STB and RESET are pulled up by 3.3K Ohm. Others are pulled up by 50K Ohm. [Printer side] [Host side] All the output signals are pulled up by 50K Ohm. 17 CITIZEN CBM-290/291 User’s Manual 6.4 Timing chart (1) Data Input and Printing Timing ACK is not outputted. T1, T2, T3 : 0.5 micro sec. MIN T4 : 270 ns MAX T5 : 2.3 micro sec. TYP T6 : 500 ms MIN (On supplying power) 6.5 Data receiving control When BUSY signal is "LOW", data from the host can be received. When it being "HIGH", data can not be received. 6.6 Buffering 4 K bytes input buffer is incorporated. Due to this large buffer, host side is released immediately. 18 CITIZEN CBM-290/291 User’s Manual 7. Serial Interface 7.1 Specifications (1) Data transfer system: Asynchronous (2) Baud rates 1200, 2400, 4800, 9600, 19200 bps (Selectable by user) (3) Configuration of one word Start bit : 1 bit Data bit : 8 bits Parity bit : Add/even or no parity (Selectable by user) Stop bit : 1 bit or more (4) Signal polarity RS-232C · Mark = logic " 1" (–3V ~ –12V) · Space = logic " 0" (+3V ~ +12V) (5) Receiving data (RD signal) RS-232C · Mark= 1 · Space = 0 (7) Receiving control (DTR signal) RS-232C · Mark : Data transfer not available · Space : Data transfer available (8) Transmission control (TD signal) DC1 code (11H) X-ON : Data reception available DC3 code (13H) X-OFF : Data reception not available 19 CITIZEN CBM-290/291 User’s Manual 7.2 Explanation of Input / Output signals 7.2.1 Input / Output signals (1) RD Serial receiving data signal. On occurrence of framing error, overrun error, or parity error, the data is printed as "?". (2) DTR When this signal is READY, write data or a command. When they are written in BUSY, overrun error is occurred and data is ignored. Even during printing, data can be loaded in the input buffer. Further, BUSY can take place on supply of power, during test printing, during on-line, or on resetting. (3) TD When, while in data reception, the rest of input buffer on the printer side goes less than 128 bytes , DC3 (13H) data reception impossible signals are output. When the rest of input buffer goes more than 256 bytes, DC1 (11H) data reception possible signals are output to the host. When DTR/DSR control having been selected in status information transmission, it is first confirmed that DSR is "space" and data is sent. When DTR/DSR control has not been selected, DSR is ignored and data is transmitted. (4) FG Case GND (5) GND Common GND on the circuit. 20 CITIZEN CBM-290/291 User’s Manual 7.3 Date configuration 1 Start bit 2 Data bit (+ parity bit) 3Stopbit ( 1 or more ) (1) Start Bit In 1/2 bit from the mark-to-space starting edge, state is read once again. When "space" state is confirmed, it is recognized as the start bit. If it is "mark" state, it is not taken as the start bit. Without taking it as an error, detection of a start bit is carried out once again. (2) Data Bit + Parity Bit Data bit and parity bit are sampled at 1/2 start bit for time length equal to 1 bit. The state thus sampled is taken as the data for the bit concerned. Bits are named as Bit 0, Bit 1, ..... parity bit counted from the one close to the start bit. (3) Stop Bit The stop bit is a mark level of 1 bit or more. With "space" having been detected on detection of a stop bit, framin...
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