Oce WP36/50 Operation Manual
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Appendix B Host Computer InterfaceB-3The pins of the printer’s RS-232C interface connector carrythe signals listed in the table below. The table also indicateswhether each signal is incoming or outgoing with respect tothe printer.Brief descriptions of the signals follow.FG - Frame Ground - (Pin 1)This pin is connected directly to the printer frame.TXD - Transmit Data - (Pin 2)This output carries asynchronous data sent by the printer tothe computer. It is used mainly in handshaking protocols.RXD - Receive Data - (Pin 3)This input carries serial asynchronous data sent by the com-puter to the printer.RTS - Request To Send - (Pin 4)This output is always held high (above 3 volts).CTS - Clear To Send - (Pin 5)DSR - Data Set Ready - (Pin 6)Unused.SG - Signal Ground - (Pin 7)All signals can transmit between the printer and the hostcomputer to send each signal with a signal ground.DTR - Data Terminal Ready - (Pin 20)This output is used as a buffer nearly-full handshake line. It isheld high (above 3 volts) when the buffer can accept more data.RS-232C Interface Voltage LevelsThe voltage levels of the interface signals conform to EIA RS-232C specifications. SPACE is from 3 volts to 15 volts. MARKis from –3 volts to –15 volts. Voltages between –3 volts and 3volts are undefined.A protocol is a set of rules the computer follows in sendingdata to the printer. They are indicated on the status page. Pa-rameters can be changed from the operator panel. SeeChanging Serial Interface Modes on page 3-19. The parame-ters and their identification codes are given below.H1: Baud rateThe factory default setting is 9600 baud.H2: Data bits7 or 8; the factory default setting is 8.H3: Stop bits1 or 2; the factory default setting is 1.H4: ParityThe factory default setting is None (0 on the status printout).3. Serial Interface (Option)3.1 RS-232C InterfacePin In/out Signal Description1 - FG Frame ground2 Out TXD Transmit Data3 In RXD Receive Data4 Out RTS Request To Send5 In CTS Clear To Send6 In DSR Data Set Ready7 - SG Signal Ground20 Out DTR Data Terminal ReadyTable B-34. RS-232C ProtocolParameter value Baud rate12 120024 240048 480096 960019 1920038 3840057 5760011 115200Table B-4Parameter value Meaning0 None1 Odd2 Even3 IgnoreTable B-5 |
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