Appendix66Parallel Interface ConnectorThe printer has a parallel interface for connecting to PC.Shape of ConnectorSignal lines and pin arrangement*Signal used for bidirectional communicationNo. I/O Signal name No. I/O Signal name1 I /STB 19 GND2 I/O DATA0 20 GND3 I/O DATA1 21 GND4 I/O DATA2 22 GND5 I/O DATA3 23 GND6 I/O DATA4 24 GND7 I/O DATA5 25 GND8 I/O DATA6 26 GND9 I/O DATA7 27 GND10 O /ACK 28 GND11 O BUSY 29 GND12 O PE 30 GND13 I SELECT 31 I /INIT14 O /AUTOFD* 32 O /FAULT15 Not used 33 Not used16 GND 34 Not used17 GND 35 Not used18 O VCC 36 I /SELIN*Signal functionsSignal name Function/STB Signal for sending data to printer.Steady-state value is High. Printerreads data until this signal becomesfrom Low to High.DATA0 to Input signal for receiving 8-bit data.Data7 Logic 1 is High. DATA0 isLSB and DATA 7 is MSB./ACK Signal indicating that printer hasread data into device completely.This signal is output in response to/STB.BUSY Signal indicating that printer isunable to receive data. Printer isable to receive data when this signalis Low.PE Signal indicating Paper Out ofprinter. This signal is Low whenpaper is loaded and is High whenpaper is out.SELECT Signal indicating that printer is underonline status. Printer is capable ofreceiving data when this signal isHigh./AUTFD Signal used for bidirectionalcommunicationGND GroundVCC Signal indicating that the power ofprinter is on. This signal allowsverifying ON/OFF status of power ofprinter and connection status ofprinter cable./INT Signal for initializing printer. Steady-state value is High. Printer isinitialized by Low./FAULT Signal indicating that printer is faulty./SELIN Signal used for bidirectionalcommunication