Lexmark T612n Technical Reference - Page 346
Using the RS-422 Serial Interface, RS-232C Port Compatibility
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8-43 Interfaces RS-232C Port Compatibility The RS-232C port or the Tri-Port interface option card is compatible with the Plug and Play External COM Device Draft Specification, Rev. 0.86. Devices that are compatible with Plug and Play COM can: • Detect attachment of serial devices. • Identify the device. • Locate a driver for the device. • Detect detachment of serial devices. Using the RS-422 Serial Interface This section describes how to use the RS-422 serial interface. If you are using RS-232, see "Using the RS-232C Serial Interface" on page 8-32. How to Connect the RS-422 Serial Interface You need to purchase a custom cable for RS-422 support. You may also need to purchase an adapter card and software to run RS-422 on your computer. Contact the place where you bought your printer.