For Dell OEM DB9 RS232 Serial Port Module T5HNR KMW3T Suitable for OptiPlex 3000 3070 7000 7080 7010 SFF MT Plus Tower Desktop COM Expansion Board

This is original Dell factory optional serial expansion accessory with dual part codes T5HNR and KMW3T, exclusively matched for OptiPlex 3000,3070,7000,7080,7010 series business desktops, covering SFF small form factor, MT mini tower and Plus full tower chassis.

Uniform structural design fits all three chassis sizes of the supported models:

1. SFF Small Form Factor compact host
2. MT Mini Tower mid-size desktop
3. Plus Full Tower large chassis
4. The metal baffle perfectly aligns with the rear reserved expansion bay of each chassis, no cutting or modification required.

Equipped with industry universal 9-pin DB9 COM port, widely used in industrial control scenarios:

1. PLC industrial controllers, measuring instruments
2. Cash registers & POS retail equipment
3. Network switches, firewalls, server console debugging
4. Built-in metal shielding shell isolates chassis electromagnetic interference to avoid signal loss during long-distance transmission.

Comes with dedicated flat connecting cable that directly plugs into the motherboard reserved serial header. Different from external USB-to-serial adapters, this internal module hides wiring inside the chassis, keeps the rear panel tidy and prevents accidental cable disconnection.

Fully compatible with Windows 10/11 business systems, the motherboard automatically identifies the serial module after installation, no third-party driver download or configuration needed, fast deployment for office and industrial workstation upgrades.