Laird BL654 Series Application Note page 4

Set up the module into Direct Test Mode, you will need to retrieve two sets of four characters each which function as
a unique passcode to enter direct test mode. To retrieve the characters, issue the following command:
AT I 14
You should receive a response such as:
10 14 01
Note the characters in the highlighted positions above. In our example in
Figure 3: Return from at i 14
To enter Direct Test Mode, using the characters you found in the previous steps, issue the AT+DTM command as
follows:
AT+DTM 0xCB717B03
The module is now in Direct Test mode.
Click Close Port to disconnect the development board from UwTerminalX.
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Figure 3, they are
4
CB71 and 7B03.
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