Epson C82305 Serial Interface Card LQ-570+ LQ-1070 LQ-1170 Stylus Color 800

Epson C82305 Serial Interface Card LQ-570+ LQ-1070 LQ-1170 Stylus Color 800

The Epson C82305 is a serial interface expansion card designed to add RS-232 serial connectivity to compatible Epson dot-matrix and inkjet printers. It plugs directly into the printer's expansion slot and provides a DB-25 serial port on the bracket, allowing the printer to communicate with a host computer via a standard RS-232 serial cable rather than the built-in parallel interface.

Specifications & What's Included

• Manufacturer: Epson
• Part Number: C82305
• Assembly Number: ASSY.2001199
• Interface: RS-232 Serial
• Connector: DB-25 serial port on bracket faceplate; secondary smaller serial connector also present
• Form Factor: Plug-in printer expansion card/module
• Compatible Printers: Epson LQ-570+, LQ-1070, LQ-1170, Stylus Color 800
• PCB markings: Epson VCI label, multiple DIP ICs visible on board
• Card only — no serial cable, documentation, or mounting hardware included

Applications

Serial interface cards like the C82305 were used in office and business environments where printers needed to connect to a host via RS-232 serial rather than the standard Centronics parallel port — common in settings where the computer was located farther from the printer than a parallel cable allowed, or where the host system's primary output was a serial port. The Epson LQ series were workhorse dot-matrix printers widely used in the late 1980s and 1990s for invoices, multi-part forms, and continuous-feed printing in accounting and point-of-sale environments. The Stylus Color 800, a mid-1990s inkjet, also accepted this card for serial-connected operation. These expansion interface cards remain relevant today for anyone maintaining legacy Epson LQ or Stylus hardware in environments where serial communication is still in use, such as older industrial control systems, point-of-sale setups, or vintage computing configurations.