Epson EPL-6000 Product Information Guide - Page 3

EPL-6000 LASER PRINTER Interface timing The figure below shows the timing for the parallel interface. SELECT -A DATA'-a 4 DATA STROBE k 'e".Ti BUSY ACK A: 1 ps (min.) 8: 1 )B (min.) C: 1 ps (min.) D: approx. 6 ps Signal levels Output signals: Input signals: Vo,=Oto0.4V v,, = 2.4 to 5.0 V v,, =0 to 0.8 V V," = 2.0 to 5.0 V Serial interface The laser printers built-in serial interface can be set for either RS-232C or RS-422A operation. These interfaces have the following characteristics. Data format Word length: 7 or 8 bits Parity: 0 or 1 bit (None, Odd, Even, Ignore) Start bits: 1 bit Stop bits: 1 or 2 bits The data format can be set using functions and menu items in SelecType. Baud rate 300, 600, 1200, 2400, 4800, 9600, 19200 bits per second. Signal level RS-232C: RS-422A: v, = 2.2 to 12 V v, =-I.4 to -12V v, = 2.5 to 5V v, = 0 to 0.5 V Transmission procedures Ready/ Busy: l The DTR signal level changes to HIGH when the printer is ready to receive data (or to LOW if set for inverted operation by SelecType). l The DTR signal level changes to LOW when the printer is not ready to receive data (or to HIGH if set for inverted operation by SelecType). XON/XOFF: l When the printer is ready to receive data, it sends an XON (11 hex) to the host computer through the TD line for the RS-232C interface or SD+ and SD- lines for the RS-422A interface. When ROBUST-XON is set to ON (by SelecType). and data is not received within one second of the XON signal being sent, the printer sends an XON signal every second. If ROBUSTXON is set to OFF, the printer sends only one XON signal. l When the printer is not ready to receive data, it sends an XOFF (13 hex) to the host computer through the TD line for the RS232C interface or SD+ and SD- lines for the RS-422A interface. l The printer is ready to receive data when it is on line, no error conditions exist, and the buffer is not tilled above the overload value set with SelecType. l The printer is not ready to receive data when it is off line or when it is on line but the remaining capacity of the data buffer is less than the overload buffer value. Serial interface pin assignments The serial interface connector pm assignments and a description of the interface signals are shown in the table below. The direction of signals is given relative to the printer. I Description Frame ground. Safety I ground Iine. Transmit data This pin transmits serial data from the printer to the computer. I Receive data. This pin transmits serial data from me computer to Request to send. This pin is HIGH when power is on Clear to send. This pin 1 indicates that the computer is ready to receive data from the printer. Data set ready. This pin indicates mat the computer -1 is ready to communicate Signal ground. This pin provides a ground for all the signal lines. Send data. This pin sends serial data from the printer to the computer. , Signal level is RS-422A / Send data. This pin sends serial data from me printer to the computer. Signal level is RS-422A Same as DTR. I Receive data. This pin transmits serial data from j the computer to the printer Signal Ievel is RS-422A. Data terminal ready. This pin indicates whether or not i the printer is ready to ; receive data. If the printer I / ready protocol is not selected, this pin is always , HIGH (i.e. the printer is 1 ready to receive data). If printer ready protocol is selected, the printer can / accept data when the pin level is HIGH. and cannot accept data when the pin : level is LOW. When busy i Not a signal, but a +5V 1 power supply output. i Maximum of 300mA / Laser Printers 7/18/89 EPL-3