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Serial Cable Pin-outs
The following cable diagrams show the cable pinouts for the most
common serial configurations.
DB-9 RS-232 Serial Connection — HP LaserJet 4
If the computer has a serial port with 9 pins, use the cable or
equivalent for the HP LaserJet 4.
Figure 3-7 24542G Cable Pinout for 25 to 9 Pin Connector
Configuration 3-35