This DB9 to 3-pin adapter cable is the same cable included with the 2-Channel RS232 Pico module. Whilst we've stocked this to allow owners of the 2-channel RS232 Pico module to purchase a second cable for use with the additional channel, it's also useful for any other RS232 projects requiring a breakout to female jumper headers for use with standard 2.54 pin headers. Pinout * Black wire = GND * Red wire = RX1 * Yellow wire = TX1 https://elecena.pl/product/22727171/db9-to-3-pin-adapter-cable 2023-03-07 https://elecena.pl/product/22727171/db9-to-3-pin-adapter-cable 2023-12-27 https://elecena.pl/product/22727171/db9-to-3-pin-adapter-cable 2024-09-18 https://elecena.pl/product/22727171/db9-to-3-pin-adapter-cable 2024-11-29 https://elecena.pl/product/22727171/db9-to-3-pin-adapter-cable 2024-11-30 https://elecena.pl/product/22727171/db9-to-3-pin-adapter-cable 2025-11-28 https://elecena.pl/product/22727171/db9-to-3-pin-adapter-cable 2025-11-29