Wifi to RS-232 serial via a DB25 plug. Control your serial plotter wirelessly
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Serial-GPIB converter for HP plotters
3d printed replacement for a commonly-busted part
3d printed replacement part
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