RS Pro D-sub, 9-Pin (Serial) Male to D-sub, 25-Pin Male Network Adapter

The 218‑251 is a moulded adapter that converts a 9‑way D‑sub male (serial) interface into a 25‑way D‑sub male interface. It simplifies connecting devices with differing D‑sub formats in control, automation, and legacy serial systems. Built for durability, the unit supports frequent mating cycles and offers a robust, space‑efficient solution for bridging communication ports in industrial and IT installations.

Special Features and Benefits of Choosing this D-sub 9-Pin Male Network Adapter

• Converts from 9‑pin D‑sub male to 25‑pin D‑sub male connectors.
• Moulded single‑unit construction increases mechanical strength and simplifies installation.
• Designed for up to 100 mating cycles for durable reuse.
• Supports an operating voltage of up to 300 V (as per specifications) for signal‑level applications.
• Space‑efficient profile fits within control panels and tight cable‑routing paths.
• Ideal for legacy serial interfacing and cross‑format D‑sub connectivity.

Engineered for Signal Connectivity

The 218‑251 adapter is engineered for straightforward plug‑and‑play deployment in environments where a 9‑pin serial port must be adapted to a 25‑pin D‑sub interface. Its full‑moulded body offers consistent shielding, stable pin contacts and reliable mechanical coupling via standard jackscrews.

Applicable Areas of the Adapter

• Converting a DE‑9 (9‑pin serial) port on older equipment to a DB‑25 interface on a controller.
• Integrating legacy communication devices (e.g., RS‑232 modules) with control cabinets that use 25‑pin D‑sub wiring.
• Rapid adaptation in test benches where both serial 9‑pin and 25‑pin D‑sub connectors are present.
• Maintenance of industrial automation systems where D‑sub connector variants coexist.
• Field service adaptation of serial peripherals to interface with 25‑pin legacy ports.

For more information please check the datasheets.