Epson FX-286 User Manual - Page 122

Table E-1, continued Signal Return Pin Pin Signal 13 SLCT 14 AUTO FEED XT 15 16 17 18 19 - 30 31 NC OV CHASSIS GND NC GND INIT 32 ERROR 33 GND 34 NC 35 36 SLCT IN Direction Description OUT Pullled up to + 5 volts through 3.3K ohm resistance. When this signal is LOW, the paper is IN automatically fed 1 line after printing. The signal level can be fixed to this by setting DIP switch 2-4 to ON.) Unused. Logic ground level. Printer's chassis ground, which is isolated from the logic ground. Unused. Twisted-pair return signal ground level. IN When this level becomes LOW, the printer controller is reset to its powerup state and the print buffer is cleared. This level is usually HIGH; its pulse width must be more than 50 microseconds at the receiving terminal. OUT This level becomes LOW when the printer is in: 1) Paper-end state. 2) Off line. 3) Error state. Same as for Pins 19 - 30. Unused. Pulled up to + 5V through 3.3K ohm resistance. IN The DC1/DC3 code is valid only when this signal is "HIGH". (Internal fixing can be carried out with DIP switch pin 2-1. The level of this signal is factoryset to "LOW".) Notes: 1. The column heading "Direction" refers to the direction of signal flow as viewed from the printer. 2. "Return" denotes the twisted-pair return, to be connected at signal ground level. For the interface wiring, be sure to use a twisted-pair cable for each signal and to complete the connection on the return side. To prevent noise, these cables should be shielded and con- nected to the chassis of the host computer or the printer but not at both ends. 3. All interface conditions are based on TTL level. Both the rise and the fall times of each signal must be less than 0.2 microseconds. E-2