HP LaserJet 4 Service Manual - Page 416

Parallel Menu Table B-16 Parallel Menu Items Item HIGH SPEED Options ADV FNCTNS YES* NO ON* OFF * Indicates factory default. Explanation The speed at which data is transmitted to the printer. If the default value (YES) results in I/O errors or no communications, set this value to NO. Sets the parallel interface to run at a higher data rate Sets the parallel interface to run at a slower speed. ADV FNCTNS=ON enables bi-directional parallel communication, which allows your printer to send status readback messages to your computer. Setting advance functions to ON may slow personality switching. Serial Menu Table B-17 Serial Menu Items Item PACING BAUD RATE ROBUST XON Options DTR/DSR*, XON/XOFF 9600* 300 to 57600 ON* OFF DTR POLARITY HI* LO * Indicates factory default. Explanation If the computer requires hardware flow control. If the computer requires software flow control. Tells the printer how fast information will be transferred from the computer to the printer. Appears only when PACING is set to XON/XOFF. If it is set to ON, the printer sends an XON every one second until data is received when the printer is on line and when sufficient buffer space has become available. If it is set to OFF, the printer sends one XON when it can accept more data or when it is on line. Determines whether pin 8 goes high or low to indicate the printer is ready to receive data. B-22 LaserJet 5/5M/5N Printer