Silicon Labs Bluetooth® modules (BT121, BGM111)

1. Standalone mode
2. Network coprocessor (NCP) mode

Supports two control methods:

• Standalone mode

The Bluetooth® module (BT121, BGM111) is equipped with a microcomputer for control, but there are resources (flash memory, RAM) that can be used by the user. By utilizing this resource, it is possible to implement a user application.
Compared to using an external microcomputer for control, system costs can be reduced.

• Network coprocessor (NCP) mode

This mode operates under control from an external host system (microcomputer or PC). Silicon Labs documentation refers to it as Network Co-Processor (NCP) mode. Control of the Bluetooth® module is through the serial port from the host system.
It can be used when the performance of the microcomputer installed in the Bluetooth® module is insufficient, or when it is convenient from the system design point of view to load the user application on the host system.

For the library used for control, please refer to another topic (BGAPI, BGLIB, BGScript).