🔌 USB to DB9 Male/Male Cable
 
(USB Type‑A to DB9 Male RS‑232 • Serial Communication Bridge)

This cable converts USB signals into RS‑232 serial signals, allowing modern computers without serial ports to communicate with legacy devices that still rely on DB9 connectors.
 
🔧 Cable Form
USB Type‑A male ↔ DB9 male (9‑pin D‑sub)
Integrated chipset (FTDI, Prolific, or similar) handles USB‑to‑RS232 conversion
Typical length: 3ft
Plug‑and‑play with driver installation on most operating systems
 
🖥️ Compatible Devices
Networking gear: Routers, switches, firewalls (console access)
Industrial equipment: PLCs, CNC machines, barcode scanners, test instruments
Legacy peripherals: External modems, GPS receivers, serial printers
Data loggers & lab gear: Environmental sensors, scientific instruments
Point‑of‑sale systems: Cash registers, receipt printers
 
✅ Common Uses
🔧 Configuration & programming of networking and industrial hardware
📡 Data transfer between modern PCs and RS‑232 devices
🖨️ Connecting legacy peripherals (printers, modems, scanners)
🧪 Lab and field work where instruments still use DB9 serial ports
🧵 Console access for IT administrators and technicians
 
🧠 Signal Format
⚡ USB 2.0 (host side)
🔌 RS‑232 serial (±12V signaling) via DB9 male connector
🔁 Supports standard baud rates (up to 115.2 kbps or higher depending on chipset)
📏 Pinout: DB9 male (TxD, RxD, GND, RTS, CTS, DTR, DSR, DCD, RI)
 
⚠️ Things to Watch Out For
📉 Male‑to‑male DB9 means you may need a gender changer or null modem adapter depending on your device
🔌 Not interchangeable with DB9 VGA connectors (same shape, different wiring)
🧯 Requires drivers for proper operation (chipset‑specific)
📏 Ensure correct pinout — straight‑through vs null modem wiring may be required
 
🛠️ Quick Tips for Beginners
🧭 Confirm your device uses RS‑232 DB9, not VGA or proprietary pinouts
🔌 Check whether you need a null modem adapter for device‑to‑device communication
🧪 Install the correct driver (FTDI is most reliable)
🧯 Label your cable to avoid confusion with visually similar DB9 cables