Lexmark 22L0214 Technical Reference - Page 334
Using the RS-232C Serial Interface
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8-18 Interfaces SLCTIN* Receiver for the Lexmark T640x The following diagram illustrates the SLCTIN* receiver for the Lexmark T640x. Connector Pin 39 ohm ±10% 1500 pF±20% GND 74LVC161284 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. Using the RS-232C Serial Interface This section describes how to use the RS-232C serial interface.