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1 - RSSI Mode
1
2 – Ranging Mode
1
3 - Configuration
1
Mode
4 – Power Level
0
6. Operation Modes
The module has 4 operation modes, which are determined accordingly by pins M0, M1. Please refer to below instructions:
6.1. Mode Switch
User could determine the module operation mode through the combination of high-low level of M2, M1 and M0. Mode
switch can be controlled through the GPIO of the MCU.
When M2, M1 and M0 changed and the module is in idle state (AUX at high level), it can starts to work normally under new
mode, if serial data not transmitted completely, it will enter new mode after all data is transmitted; if the module receives
data and send out through serial port, the module will enter new mode after the data is transmitted completely; so mode
switch will only be valid when AUX outputs 1, or switch will be delayed.
i.e.: under mode 2 or mode 4, when user inputs large amount of data continuously and conducts mode switch, the mode
switch is invalid; the module will conduct new mode check after all data is transmitted; so, users are recommended to check
the AUX pin status and conduct mode switch 2ms later when AUX outputs high level.
When the module enters configuration mode from other modes, it will enter sleep mode when all data is processed
completely (both TX and RX). This feature can be used for quick sleep to save energy; i.e.: the transmitter works under mode
0 and the user send serial data"12345", then the user does not need to wait till the AUX enters idle state (high level) and
directly switches to sleep mode and put the user main MCU into sleep mode, the module will automatically enter sleep mode
1ms later when all data is processed so as to save the MCU working time and lower energy consumption.
Similarly, this feature can be utilized for any mode switch, the module will enter new mode automatically within 1ms when
current even is processed completely, which saves the user's efforts in checking AUX status and enables quick mode switch;
for example, when switching from transmitting mode to receiving mode, the user MCU could enter sleep mode before mode
switch, mode switch can be made by acquiring AUX change with external interrupt function.
This operation is very flexible and efficient, it is designed based on convenient MCU operation, and it could ease the
operation load of the entire system and increase the operation efficiency and lower the energy consumption.
6.2. Transmission Mode (Mode 0)
Under this mode, transparent transmission is available, that means the data transmitted from the transmitter will be received
by the receiver in the original format. Under normal mode, the two sides could communicate with each other normally based
on same air data rate, address and channel; under continuous transmission mode, the baud rates on both sides must be the
same, it supports large file continuous transmission under baud rate from 1200bps ~ 115200bps.
6.3. RSSI Mode (Mode 1)
Under this mode, the module will output current RSSI value of 2.4GHz signal every 100ms so as to check the channel quality,
the value is in HEX compliment format.
Ranging Mode (Mode 2)
6.4.
(Reserved)
.
0
1
Serial port on, RF on, RSSI on
1
0
Reserved
Serial port on ， RF off, parameter
1
1
configuration
x
x
Power Level setting: channel 17
E28-2G4T27SX User Manual
The module outputs RSSI value through serial port
every 100ms
-
Baud rate is fixed as 9600 8N1
-
8
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