UGREEN 20147 DB9 RS232 Extension Cable, 3 m

Overview

The UGREEN 20147 adds 3 m to an existing serial (RS232) link between a computer or converter and a device such as a controller, instrument, modem or point-of-sale unit. It is a DB9 male to DB9 female cable wired straight through, so it lengthens a working connection without changing it. It suits a serial device that sits across the desk or rack from the computer.

Is it right for you?

• Suits a working DB9 RS232 connection that needs 3 m more reach, where you plug the male end into a female port and the existing cable or device into the female end.
• Not for linking two devices that need a crossover (null modem) cable: this cable keeps transmit and receive on the same pins.
• Not a USB to serial converter. It adds no COM port, so the computer or adapter must already have a serial port.
• A DB9 connector alone does not mean RS232. Connect a proprietary DB9 port only when the equipment manual confirms the pinout.

Key features

• DB9 male to DB9 female, 3 m, with straight-through wiring that preserves the existing signal assignments.
• Screw-lock hardware on both D-sub connectors, so the plugs stay seated under vibration.
• Aluminium foil shielding over a multi-conductor core for ordinary interference protection.
• Flexible PVC jacket that routes easily around a desk or rack.
• Passive cable: no driver, power supply or software of its own. The cable weighs about 170 g.

What else you need

A true RS232 port at each end, with the computer, converter or device already set to matching baud rate, framing and flow control. The cable does not change any of these settings.

Installation

No fitting beyond plugging in. Tighten the screw locks by hand at each end and leave some slack so the cable is not pulled.

Before you buy

• It is not a null modem or crossover cable and does not swap the TX/RX or handshake lines.
• It does not convert USB, Ethernet, TTL UART, RS422, RS485, CAN or any other protocol to RS232.
• It adds no COM port chipset, driver, electrical isolation, surge protection or signal amplification.
• It cannot correct mismatched DTE/DCE roles, pinouts, baud settings or voltage levels.
• Only the cable is in the box. Devices, converters, chargers, other cables and mounting accessories are not included.