DB25 male to dual DB9 female serial splitter Y-cable

Two 9-pin female connectors are combined into a single 25-pin male connector. This type of cable was commonly used in older computer and industrial applications, where the device had a 25-pin serial port (DB25) but support was needed for two 9-pin connectors.

Adapter technical details:

• Y-cable length:
  • 30cm
• RS232 connectors:
  • 2x 9pin DB-9F
  • 1x 25pin DB-25M
• RS232 pinout:
  • DB25M → DB9F (COM1)
    • Pin 2 → Pin 3, (transmit data (TXD))
    • Pin 3 → Pin 2, (receive data (RXD))
    • Pin 4 → Pin 7, (request to send (RTS))
    • Pin 5 → Pin 8, (clear to send (CTS))
    • Pin 6 → Pin 6, (data set ready (DSR))
    • Pin 7 → Pin 5, (ground (GND))
    • Pin 8 → Pin 1, (data carrier detect (DCD))
    • Pin 20 → Pin 4, (data terminal ready (DTR))
    • Pin 22 → Pin 9, (ringing indicator (RI))
  • DB25M → DB9F (COM2)
    • Pin 14 → Pin 2, (receive data (RXD))
    • Pin 16 → Pin 3, (transmit data (TXD))
    • Pin 19 → Pin 7, (request to send (RTS))
    • Pin 13 → Pin 8, (clear to send (CTS))
    • Pin 25 → Pin 6, (data set ready (DSR))
    • Pin 7 → Pin 5, (ground (GND))
    • Pin 15 → Pin 1, (data carrier detect (DCD))
    • Pin 17 → Pin 4, (data terminal ready (DTR))
    • Pin 23 → Pin 9, (ringing indicator (RI))