Plotter Cable Pinout

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Schematic for a plotter cable that will work for most HP and Roland plotters. Search eBay or Amazon for DB9 to DB25 Serial Null Modem Cable or similar to find them for sale.

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Plotters

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2026-10-10

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1. ▲

   HP Pen Plotters hpmuseum.net

   Vintage desktop and floor-standing pen plotters from the creator of the HPGL standard. Model 7475A is very common and can usually be found on eBay.

   site link ↗
   site
2. ▲

   PlotAdapter github.com

   "Serial-GPIB converter for HP Plotters", uses an Arduino microcontroller to convert serial HPGL to the GPIB/HP-IB expected by some older HP plotters.

   tool link ↗
   
3. ▲

   HP 7475A Graphics Plotter Operation and Interconnection Manual archive.org

   site link ↗
   site
4. ▲

   Roland Pen Plotters youtube.com

   Vintage flatbed HPGL pen plotters. Search eBay for "roland dxy".

   video · 8 min · NYC CNC link ↗
   
5. ▲

   WiFi232 biosrhythm.com

   Wifi to RS-232 serial via a DB25 plug. Control your serial plotter wirelessly.

   site link ↗
   site
6. ▲

   HP 7470A Interconnection Guide archive.org

   site link ↗
   site

Plotters › Hardware > Accessories and Adapters: “Schematic for a plotter cable that will work for most HP and Roland plotters. Search eBay or Amazon for DB9 to DB25 Serial Null Modem Cable or similar to find them for sale.”