This listing is for a vintage 2-way DB9 RS-232 manual data transfer switch box, fully tested and working. It features a simple A/B rotary selector on the front and three DB9 female ports on the rear (Input/Output, A, B), ideal for sharing a serial printer, modem, or other RS-232 device between two systems.

The all-metal enclosure and beige finish match classic PC gear, making it a great fit for retro-computing setups, test benches, or industrial control equipment. Operation is fully passive—no external power required—so once it’s wired, you just turn the knob to route the connection where you want it.

Unit shows normal cosmetic wear from age and use (scuffs, marks, light edge wear), but overall presents clean and intact. Functionality has been verified with a basic connectivity/switching test. No accessories, cables, or original packaging are included—only the switch box shown.

Item specifics 📝

• 💾 Interface: DB9 / DE-9 RS-232 serial

• 🔀 Function: 2-way A/B manual data transfer switch

• 🔌 Ports: 1× DB9 female I/O, 1× DB9 female A, 1× DB9 female B

• 🎛 Control: Front-panel rotary selector knob (A or B)

• 🧱 Enclosure: Metal housing, beige finish

• 📏 Approx. size: ~5.5" W × 5" D × 2" H

• 🖥 Use case: Share one serial device between two computers or one computer between two devices

• 🕰 Era: Approx. late 1980s–1990s style PC accessory

• ✅ Testing: Tested and confirmed functional (basic switching/connection test)

• 📦 Included: Switch box only (no cables, manuals, or retail box)

Condition
Pre-owned, in fair to good cosmetic condition. Shows surface scuffs, marks, and light wear from normal use and storage. Tested and verified to switch correctly between A and B ports.

Additional details
Seller’s note: Item is part of a mixed pre-owned electronics lot. Photos show the exact unit you will receive. No additional parts, cables, software, or accessories are included unless they are clearly shown in the pictures. Because it is vintage equipment, it is sold in good working order at time of listing, with no long-term performance guarantee. Please review all photos and description carefully before purchasing.

Keywords
DB9 switch, RS232 switch box, A/B serial switch, data transfer switch, manual data switch, DE-9 rotary switch, vintage PC accessory, retro computer serial, RS-232 A/B box, serial printer switch, industrial serial switch, IO selector box, beige metal switch box, 2 port DB9 switch, tested RS232 switch