BLE central connect the BLE central cia Bluetooth

Hello taskit team,

We have received the adapter "BLE232", unfortunately it is not possible to connect to the BLE via Bluetooth. It does not matter whether the standard configuration is used or not. This was tested with different end devices (If relevant: Galaxy S10+, Galaxy Tab A7, OnePlus 6, Windows PC's).

Current settings are:
- BLE Role: Central
- ID: 10:24:51:20:85:85 (does this matter?)
- Serial Setup: 9600, Paritiy: none, Stop bits: 1, XON/XOFF: off

The debug console outputs the following:
LE Central: 0xF8369B4B114C
DiscBLE Central: 0xF8369B4B114C
DiscBLE Central: 0xF8369B4B114C
DiscBLE Central: 0xF8369B4B114C
[...]

Is an external power supply necessary? If so, must this be connected via all signals DCD,DSR,RST,...? or is one of these connections sufficient and must Schottky diodes be used there?