EXSYS EX-47999 Null Modem Adapter DB9 Female to DB9 Female RS-232 Serial Coupler

In many industrial and legacy setups, directly linking two computers or terminals without a modem still trips up technicians—until they reach for a null modem adapter. The EXSYS EX-47999 solves that with a compact, metal-shielded DB9 female-to-female coupler whose internal crossed wiring instantly creates a DTE-to-DTE link. No cable cutting, no soldering, no guesswork.

Highlights

• Null modem pinout with crossed TX/RX, RTS/CTS, and DTR/DSR lines
• Both connectors are DB9 female, ideal for extending or converting existing serial cables
• Rugged metal housing with full shielding against EMI
• RoHS compliant and compatible with standard RS-232 devices
• Compact form factor fits easily into tight equipment racks or field kits

In daily use

Plug one end into a 9-pin serial cable coming from a PC, terminal server, or instrument, and the other into a second cable or directly into a device. The adapter swaps transmit and receive pairs plus hardware handshake lines, so two DTE devices communicate as if a null modem cable were installed. The silver metal shell provides durability and grounding continuity, while the 9-pin configuration supports legacy and modern RS-232 ports alike.

Full specifications

• Connector 1: DB9 female
• Connector 2: DB9 female
• Adapter type: Null modem
• Interface: RS-232 serial
• Number of pins: 9
• Pinout: Crossed (TX/RX, RTS/CTS, DTR/DSR)
• Housing material: Metal
• Colour: Silver
• Application: DTE to DTE communication
• Compatibility: Standard RS-232 devices
• Form factor: Compact adapter
• Shielding: Yes
• RoHS compliant: Yes

Final note

A small but essential tool for serial communication troubleshooting, legacy system integration, and field service—the EXSYS EX-47999 keeps your RS-232 connections reliable without bulky null modem cables.