I have 2 different type of connectors of 3.5mm to DB9 that I use to send RS232 commands from device to a screen. The 3.5mm is attached to the device on the serial port and the DB9 to a serial cable and connected to the screen.
Now, I have 2 different devices (A and B) that can send serial commands. The connector on the left works on device A but does not work on B and the connector on the right (with pink tag) works on device B but no on A.
The 'pink' connector has a serial number, and when I Googled it, it says its a CBF Signal, and when I dig deeper it just says its a rs232 connector.
Can someone explain what are the differences between these 2 different connectors and why it works on a specific device where in the end, they are just 3.5mm to DB9 serial connectors?