Epson EPSON-003 DB9 to DB25 Null Modem Cable

Overview

The Epson EPSON-003 is a 10-foot null modem cable connecting legacy receipt printers to host systems via cross-coupled RS-232 serial lines. DB9 female termination plugs into the printer; DB25 male termination connects to the host controller or industrial equipment. The null modem configuration inverts signal pins (RX/TX, RTS/CTS, DTR/DSR) so devices communicate directly without intermediate modems or converters. Deploy this where a thermal receipt printer and a POS terminal, warehouse controller, or legacy industrial system must handshake over standard serial protocol — typical installation distances in point-of-sale, logistics, and cross-dock environments.

Compatibility

Designed for Epson thermal receipt printer systems equipped with DB9 serial ports supporting RS-232 protocol. Connects to host systems with DB25 serial interfaces — common on older POS platforms, warehouse management terminals, industrial controllers, and legacy automation equipment. Verify your printer's connector gender and pin layout before ordering; this cable specifically requires DB9 female on the printer end. The 10-foot length bridges typical distances between printer and host controller in counter-service, shipping, and sorting environments without signal degradation.

Installation Notes

Null modem wiring means no additional converters or pin-swapping adapters are required — plug both ends directly into their respective ports. Ensure both devices have serial drivers or firmware configured to expect null modem handshaking; some older systems require manual handshake line configuration. Test connectivity with a serial communication utility before deploying in production. Keep the cable away from high-current power lines and industrial radio-frequency noise to minimize transmission errors on long runs.