Lexmark MX826 Printer Languages and Interfaces Technical Reference - Page 142

Protocol RS-232C, DTR/DSR protocol Honor DSR off

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Printer interfaces 142 Data flow control The following lines accomplish data flow control: • Data Set Ready (DSR) • Data Terminal Ready (DTR) Available data flow control protocols: • 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 more data. The following conditions exist when the signals continue: • No data has been received across the serial port in the last second. • The host computer accepted the last XON. • The printer is ready to receive data. For more information about selecting the protocol from the control panel or through MarkVision Enterprise, see the documentation that came with your printer. Protocol (RS-232C) The following table shows the state or function of each serial interface signal in the three data flow control protocols when the Honor DSR setting is On. Printer XON/XOFF protocol (Honor DSR on) DTR Always active DSR Data validity CTS Ignored DTR protocol (Honor DSR on) DTR/DSR protocol (Honor DSR on) Flow control to computer Flow control to computer Data validity Flow control (transmit mode) to computer (receive mode) Flow control from computer Ignored The following table shows the state of each serial interface signal in the three data flow control protocols when the Honor DSR setting is Off. Printer signal XON/XOFF protocol (Honor DSR off) DTR protocol (Honor DSR off) DTR/DSR protocol (Honor DSR off) DTR (Output) Always active Flow control to computer Flow control to computer DSR (Input) Ignored Ignored1 Flow control to computer CTS (Input) Ignored Flow control from computer1 Ignored 1 These values are compatible with Hewlett-Packard Company LaserJet printers.

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Data flow control
The following lines accomplish data flow control:
•
Data Set Ready (DSR)
•
Data Terminal Ready (DTR)
Available data flow control protocols:
•
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 more data.
The following conditions exist when the signals continue:
•
No data has been received across the serial port in the last second.
•
The host computer accepted the last XON.
•
The printer is ready to receive data.
For more information about selecting the protocol from the control panel or through MarkVision Enterprise,
see the documentation that came with your printer.
Protocol (RS-232C)
The following table shows the state or function of each serial interface signal in the three data flow control
protocols when the Honor DSR setting is On.
Printer
XON/XOFF protocol (Honor
DSR on)
DTR protocol
(Honor DSR on)
DTR/DSR protocol (Honor DSR on)
DTR
Always active
Flow control to computer
Flow control to computer
DSR
Data validity
Data validity
Flow control (transmit mode) to computer
(receive mode)
CTS
Ignored
Flow control from computer
Ignored
The following table shows the state of each serial interface signal in the three data flow control protocols when
the Honor DSR setting is Off.
Printer signal
XON/XOFF protocol (Honor
DSR off)
DTR protocol
(Honor DSR off)
DTR/DSR protocol (Honor DSR off)
DTR (Output)
Always active
Flow control to computer
Flow control to computer
DSR (Input)
Ignored
Ignored
1
Flow control to computer
CTS (Input)
Ignored
Flow control from computer
1
Ignored
1
These values are compatible with Hewlett-Packard Company LaserJet printers.
Printer interfaces
142