Lexmark W820 User's Guide - Page 252
Robust XON, RS-232/RS-422, RS-422 Polarity
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Robust XON Purpose: To determine whether the printer communicates availability to the computer. Values: Off* Printer waits to receive data from the computer. On Printer sends a continuous stream of XONs to the host computer to indicate that the serial port is ready to receive more data. This menu item only applies to the serial port if Serial Protocol is set to XON/XOFF. RS-232/RS-422 Purpose: To specify the type of serial communication. Values: RS-232* RS-422 Note: Selecting RS-422 automatically sets Serial Protocol to XON/XOFF. RS-422 Polarity Purpose: To establish the behavior of the positive and negative signals when using RS-422 serial communication. Values: Normal* Reverse Uses default definition of one and zero. Reverses the definition of one and zero, thereby allowing a positive connection to a host computer negative terminal without changing the physical cable. 250
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