Serial null modem cable StarTech 3 m RS232 DB9 female-to-male with Al-Mylar shielding, crossover for DTE devices, black

The StarTech 3 m RS232 DB9 female-to-male null modem cable provides a ready-made solution for point-to-point serial communication between DTE devices. This 3-metre cable uses crossover wiring to map transmit and receive lines appropriately for direct device-to-device connections. The cable is fitted with DB9 female and male connectors with thumbscrews for a secure mechanical connection and an Al-Mylar shielded jacket to reduce electromagnetic interference.

Advantages

The crossover wiring eliminates the need for adapters when connecting two DTE devices, simplifying setup. Aluminum Mylar shielding combined with shielded metal shell connectors reduces EMI for more reliable serial data transfer. Thumbscrew connector locks prevent accidental disconnection, helping to avoid data interruption or corruption. The cable’s 3 m length offers flexibility for equipment placement while the black jacket provides a low-profile appearance.

Suitable for

• Serial console access and device configuration
• Connecting legacy RS232 equipment such as modems, industrial controllers or instrumentation
• Point-to-point data transfer between computers, terminals or peripherals
• Laboratory and workshop setups requiring short-run serial links

Key specifications

• Cable length: 3 m
• Connector types: DB9 female to DB9 male
• Wiring: null modem / crossover wiring for DTE-to-DTE connections
• Shielding: Aluminum-Mylar (Al-Mylar) cable shield and shielded metal shell connectors
• Jacket color: black
• Connector retention: thumbscrew locking hardware
• Compliance: RoHS compliant

How to use

Identify the serial ports on the two DTE devices to be connected and ensure both devices are powered off before making the connection. Align the DB9 female and male connectors, insert them fully and tighten the thumbscrews by hand to secure each connection. Once connected, power on the devices and configure serial port settings (baud rate, parity, data bits, stop bits, and flow control) on both devices so they match. For troubleshooting, verify pinout compatibility and confirm that crossover wiring is appropriate for the devices in use.

Usage recommendations

Place the cable away from high-voltage power lines and sources of strong electromagnetic noise where possible. For reliable long-term performance, avoid sharp bends and excessive tension on the cable; route the cable to prevent kinks and secure connectors with the thumbscrews to minimize accidental disconnection.