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WIRELESS CONNECTIVITY & SENSORS
User manual Proteus-II
5. Functional description
5.1. Operation modes
The Proteus-II module acts as a slave and can be fully controlled by an external host. The
Proteus-II supports the following operating modes:
• The command mode , where the Proteus-II can be controlled by the host controller via
commands. The command mode allows to use all central and peripheral function of the
radio module. The functions of the radio module, like data transmission or configura-
tion tasks, can be triggered by predefined commands (see chapter
7
) that are sent as
telegrams over the UART interface.
• The peripheral only mode (see chapter
10
) provides a transparent UART interface and
supports only the peripheral functions of the radio module. Data transmission can be
done by the host without using any commands.
5.2. Radio module states
The Proteus-II can operate in different states. Depending on the active state several com-
mands of the command interface (see chapter
7
) are permitted to modify the state, configure
the module or transmit data over the radio interface. An overview of the different states and the
corresponding allowed commands can be found in Figure
7
.
When the Proteus-II is powered up, it starts in
ACTION_IDLE
state. In this state the module
advertises (Bluetooth
®
LE role "peripheral"), such that other devices in range (Bluetooth
®
LE
role "central" or "observer") can detect it and connect to it. If no connection was setup after
RF_AdvertisingTimeout
seconds, the module goes to
ACTION_SLEEP
state which will stop ad-
vertising.
The
ACTION_IDLE
state also allows to switch to
ACTION_SCANNING
state, where the module stops
advertising and scans for other advertising modules in range (Bluetooth
®
LE role "central").
When leaving the
ACTION_SCANNING
state with the corresponding command, the module is in
ACTION_IDLE
state and starts advertising again.
The
ACTION_CONNECTED
state can be entered either by getting a connection request from an-
other module (Bluetooth
®
LE role "peripheral") or by setting up a connection itself (Bluetooth
®
LE
role "central"). In this case it stops advertising and data can be transmitted and received to/from
the connected module. This state remains active as long as the module does not disconnect
itself (e.g. due to a timeout), no disconnection request from the connected device is received.
When disconnecting, the module goes to
ACTION_IDLE
state and starts advertising again.
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