Lexmark 33S0300 Technical Reference - Page 334

8-20 Interfaces SLCTIN* Receiver for the Lexmark Lexmark E120, E120n, E238, E240, E240n, E250d, E250dn, E340, E342n, E350d, E352dn, E450dn The following diagram illustrates the SLCTIN* receiver for the Lexmark E120, E120n, E238, E240, E240n, E250d, E250dn, E340, E342n, E350d, E352d, E352dn, E450dn. Connector Pin 39 ohm ±10% 1500 pF±20% GND 74LVC161284 Note: The cap value is 1000 pF for E238, E240, E240n, E250d, E250dn, E340, E342n, E350d, E352d, E352dn, and E450dn. 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. Use RS-232C serial interface if the printer is more than 3.04 m (10 ft) from the computer but less than 15.24 m (50 ft) away. (You can also use a 6.1 m (20 ft) Lexmark cable to connect a printer and a computer located up to 20 feet apart.) 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.