Laird BL654, Application Note

Page: 5 / 15

https://www.lairdconnect.com/wireless-
modules/bluetooth-modules
5
© Copyright 2021 Laird Connectivity, Inc.
All Rights Reserved
Americas : +1-800-492-2320
Europe : +44-1628-858-940
Hong Kong : +852 2923 0610
Now that the module is in Direct Test Mode, it accepts DTM commands as specified in the BT SIG Bluetooth Core
Specifications . See Bluetooth Core Specifications v 4.1 vol. 6 part F - Direct Test Mode , at
https://www.bluetooth.com/specifications/bluetooth-core-specification.
To use Direct Test Mode, you need Nordic’s nRFgo Studio, found at: http://www.nordicsemi.com/eng/Products/Bluetooth-
low-energy/nRF52832
Once the BL654 is in DTM mode, you can communicate with the BL654 over the UART with UwTerminal using the following
communications settings:
COM Port Same as before
Baud Rate 19200
Parity
None
Stop Bits
1
Data Bits
8
Handshaking CTS/RTS
Before entering DTM Mode, you may configure TX Power, Baud Rate, and DCDC. Changing these values is optional.
However, if you choose, you may set these values as follows (Note that if using BL654 firmware 29.5.7.2 and an option is
changed, the following command must be used prior to entering DTM mode to allow the radio to operate:
AT+DTMCFG 19
1 ):
Command AT+DTMCFG 1 n
Values for n 8, 7, 6, 5, 4, 3, 2, 0, -4, -8, -12, -16, -20, -40
Default 8
Command AT+DTMCFG 2 n
Values for n
9600, 14400, 19200, 38400, 57600, 115200
Default 19200
Command AT+DTMCFG 3 n
Values for n 0 (Disabled), 1 (enabled)
Default 1