User's Manual

NC Module enters transparent mode
3. P25 pin (GPIO23): Connection status indicator
Pin status Module status
Low output standby mode
Output high Connection Status
4. P23 pin (GPIO26): Connect interrupt pin (module is in valid connection state)
Pin status Module status
No action Connection Status
Input 200ms low level pulse Interrupt connection, module enters standby
9．Dimensions:
10．LAYOUT
Precautions:
The DX-BT18 dual-mode Bluetooth module works in the 2.4G wireless band. It should try to
avoid the influence of various factors on the wireless transceiver. Pay attention to the following
points:
1. The product shell surrounding the Bluetooth module to avoid the use of metal, when using
part of the metal shell, should try to make the module antenna part away from the metal part.
2. The internal metal connecting wires or metal screws of the product should be far away from
the antenna part of the module.
3. The antenna part of the module should be placed around the PCB of the carrier board. It is
not allowed to be placed in the board and the carrier board under the antenna is to be milled empty.