Manual Data Switch Box DB9 Female 4-port usually works for Serial Devices

Manual Switch Box
4-Way DB9 A/B/C/D Switch
DS-9DBF-M04

DB9 4-way A/B/C/D Manual Switch Box, 4 to 1 Input/Output. Five DB9 Female connectors. Application: Used for sharing serial peripherals or CGA/EGA monitors. Metal case helps prevent unwanted EMI/RFI interference.