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An HP® LaserJet® printer on a serial connection without a PostScript card is disabled by the scheduler after printing only two or three pages of a multipage document. This happens because the HP LaserJet printer drops DTR (data terminal ready) and DCD (data carrier detect) signals during flow control. The system detects the loss of carrier and hangs up the line.
You can circumvent this problem by setting the line to ignore
the loss of carrier by executing stty clocal on the line.
To reconfigure the printer to set the line from the
specified printer destination, enter:
/usr/sbin/lpadmin -p printer-name -o stty="'clocal -onlcr'"