Agilent Technologies 54831A User's Quick Start Manual page 31

Setting Up the Oscilloscope
To connect a printer
6 Attach the 25-pin "D" connector to the serial input port of the printer.
Tighten the thumbscrews to secure the cable.
Figure 1-18
Attaching the 25-pin "D" Connector
7 Set the printer configuration to use the serial interface. See the
documentation for your printer.
8 Go to "To install the printer software" in Chapter 3.
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Port on Printer