Lexmark 21S0732 Technical Reference - Page 372
Data Flow Control, XON/XOFF and DTR pacing. When XON/XOFF/DTR/DSR mode is active, the printer
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8-34 Interfaces Data Flow Control Data flow control is accomplished through the following lines: • Data Set Ready (DSR) • Data Terminal Ready (DTR) Five data flow control protocols are available: • DTR pacing • DTR/DSR • XON/XOFF • XON/XOFF/DTR • XON/XOFF/DTR/DSR Your printer supports two modes in which both hardware and software data flow control protocols are performed. In XON/XOFF/DTR mode, the printer uses both XON/XOFF and DTR pacing. When XON/XOFF/DTR/DSR mode is active, the printer uses both XON/XOFF and DTR/DSR pacing. Robust XON may be selected when the data flow control protocol for the serial port is set to XON/XOFF, XON/XOFF/DTR, or XON/XOFF/DTR/DSR pacing. The printer sends a continuous stream of XON signals to the host computer to indicate that the serial port is ready to receive additional data. The signals continue as long as one of the following conditions exist: • No data has been received across the serial port in the last second. • The last XON was accepted by the host computer. • The printer is ready to receive data. Refer to your printer user documentation for more information about selecting the protocol from the printer operator panel or through MarkVision Professional.