Functional Overview
Formatter System
Serial I/O (LaserJet 4P/4MP)
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The LaserJet 4P/4MP printer supports RS-232 compatible serial
communications. The printer uses a 9-pin D-subminiature
connector. (See Appendix B for pin-out information.)
Pacing (Serial Modes of Operation)
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The “Pacing” configuration item is user-selectable. Available
choices under Pacing are:
* DTIUDSR (default) - This mode, primarily implemented for
PCs, has hi-directional data flow which is paced using hardware
pacing. No XON or XOFF signals are sent.
e XON/XOFF - This mode is primarily intended for UNIX
machines which cannot perform hardware pacing yet want
hi-directional data flow. Data flow is paced using XON and
XOFF signals to indicate when the printer is ready to accept
new data from the host.
LocalTalk I/O (LaserJet 4ML/4MP)
The LaserJet 4ML/4MP printers implement the AppleTalk
networking protocol through the LocalTalk hardware. The
LocalTalk network cable (HP P/N 92215N) is connected through an
8-pin DIN connector on the printer’s I/O panel. (See Appendix B
for more cabling information.)
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