Lexmark T620 Technical Reference - Page 329
Serial Interface, Using the RS-232C Serial Interface, How to Connect the RS-232C Serial Interface
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8-31 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. Some printers have a standard serial connector for RS-232C serial interface. If a serial connector is not standard, you may be able to install a Tri-Port interface option card. Refer to your printer user documentation for more information. The Tri-Port interface option card supports two serial interface standards: RS-232C and RS-422. The RS-422 serial interface provides more protection from electrical noise than RS-232. 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.) Use RS-422 if your computer is more than 15.24 m (50 ft) away from the printer. You may need to purchase an RS-422 adapter and software for your computer to run RS-422. Refer to your computer documentation for more information. You also need to purchase a custom cable for the serial interface, because serial RS-422 interface pinouts are usually unique to each computer. 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. If you are using RS-422, see "Using the RS-422 Serial Interface" on page 8-42. How to Connect the RS-232C Serial Interface Use Lexmark serial cable P/N 1038693 (15.24 m or 50 ft) to connect the serial interface.