Lexmark 21Z0294 Technical Reference - Page 313
Using the RS-232C Serial Interface, Serial Interface, RS-232C Serial Cable Pin Assignments
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8-11 Interfaces Serial Interface The serial interface allows data to flow back and forth between the computer and the printer. However, the serial interface transfers data at a slower rate than the parallel interface. If a serial connector is required, you may be able to install an RS-232C Serial Interface Card, an External Serial Adapter, or an RS-232C Serial/Parallel 1284-C Interface Card. See your printer documentation for more information. When using the serial interface, your printer has the following differences from the serial interface on some other printers: • The printer returns XON/XOFF with 2 stop bits in all cases. • The printer does not support DTR inversion. Using the RS-232C Serial Interface RS-232C Serial Cable Pin Assignments The RS-232C serial cable appears as follows: 25-Pin 13 25 D-Shell (Male) 25-Pin D-Shell 13 25 (Female) 1 14 Printer Side 1 14 Computer Side Table 8-3: Dedicated Serial Connector Pin Assignments (RS-232C) Pin Signal Direction Description 1 GND Frame Ground 2 TXD Out Transmit Data. The pin transmits data to your computer or terminal. 3 RXD In Receive Data. The pin receives data from your computer or terminal.