Manual Data Switch Box DB9 Female 2-port usually works for Serial Devices

Manual Switch Box
2-Way DB9 A/B Switch
DS-9DBF-M02

DB9 2-way A/B Manual Switch Box, 2 to 1 Input/Output. Three DB9 Female connectors. Application: Used for sharing serial peripherals or CGA/EGA monitors. Metal case helps prevent unwanted EMI/RFI interference.