AppconWireless RF1276 Series Manual de usuario
RF1276 LoRa module V3.0
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1. General
RF1276 series is a low cost, ultra-low power, high performance transparent two way semi-duplex LoRa
modulation transceiver with operation at 915Mhz band. It integrates with high speed MCU from ST and high
performance RF IC SX1276. Adopting high efficiency forward error correction with interleaving encoding
(FEC) technology, it makes anti-interference ability and reception sensitivity greatly improved. That
guarantees good performance in the harsh environment such as some industrial application. The FEC
technique is advanced and unique in radio data communication field.
RF1276 has the UART/RS232/RS485 interface, that make it is easy to implement wireless data
transmission. It is flexible for users to set the baud rate, frequency, output power, air data rate etc parameters.
It can transmit transparent data with large data buffer and also can provide over 32 channels. The compact
size makes it an ideal option for radio data communication application.
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2. Features
5000 meters of communication distance（300bps）
Output power: Max100mW (20dBm) (127 levels adjustable)
Air data rate: 300 - 19200bps, can be configured through RF tool
UART data rate: 1200 - 57600bps, can be configured through RF tool
Frequency: 902.5MHz – 927.5MHz
Working Current: 90mA(TX), 19.2mA(RX), 2.2mA(idle), 220uA(Sleeping)
More than 32 channels
parity of series COM: 8E1/8N1/8O1
LoRa modulation
Receive sensitivity: -148dBm(@300bps)
UART/TTL, RS232, RS485
Exceed 256 bytes data buffer
Supply Voltage: 4.5V – 5.5V (2.1V – 3.7V optional)
Simply tool for configuration
125KHz, 250KHz, 500KHz Channel spacing
Dimension: 44.5mm x 23.6mm x 7.0mm
3. Application:
Automated Meter Reading (AMR)
Remote control, remote measurement system
Access control
Data collection
Identification system
IT household appliance
Baby monitoring system
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4. Maximum specification
Symbol Parameter Min Max Units
VCC Supply Voltage 4.5 5.5 V
TOT Operation Temperature -30 85 ℃
HOH Operation Humidity 10% 90%
TST Storage Temperature -55 125 °C
5. Pin Out:
RF1276 module has 5 pins. Refers to the Table 1：
RF1276
Pin NO. Pin Name Description
1 VCC Power supply DC 4.5V-6.5V
2 GND Grounding of Power Supply
3 RXD Serial input, 485+/485A
4 TXD Serial output, 485-/485B
5 AUX Data in/out indication
Table 1: Pin definition
6. Working mode
a. Standard mode
Standard mode is also called transparent mode in which the module receives from or sends data to the host
through serial port (RS232 or RS485) at preset data format and users don’t need to care about the proce ss of
data inside the module. The AUX pin of RF1276 will give indication about the data IN/OUT of serial port
2ms in advance in order to wake up the host.
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Timing Sequence in Standard Mode
b. Low power mode
In this mode RF1276 enables serial port and CAD monitor which means the module monitors the wireless
link periodically. When it detects the wireless signal in the wake-up period, it will open the receive circuit,
pick out the effective data and transfer it to the host through the serial port. The AUX pin will produce a low
level signal 2ms in advance to inform he host that the data comes.
Timing Sequence in Low Power Mode
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c. Sleep mode
In this mode most functions of the modules are disabled so if two modules are set to the Sleep Mode, they
can’t communicate with each other so one module must be in Low Power Mode. Comparing to Low Power
Mode, the modules in SLEEP MODE will not enable serial port and only keeps CAD monitor. When it
detects effective wireless signal, it will then enable the serial port. If there is no data In/Out in 1 seco nd, it
will close the serial port and continue the CAD monitor
Timing Sequence in Sleep Mode
7. Dimension
Figure 1: Size of Module
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8. Parameter Configuration
Through serial port or using setting tool ‘Rf-Tool’, users can configure relative parameters such as
frequency, UART rate, air rate, checkout mode and so on.
It is very simply for configuration. Based on different requirement, all options can be selected visually. It
is shown in Table 2 and Figure 3.
Parameter Description
UART area The values are fixed at 9.6k bps & no parity check.
RF frequency It indicates the center frequency of RF carrier
RF mode Standard mode, Low Power mode
RF_Factor Lora spreading factor. Larger value means higher sensitivity but
longer air transmission time
RF_BW Lora bandwidth. Larger value means lower sensitivity. Recommended
value: 125K.
Node ID Reserved
Net ID Only the modules with the same network ID can communicate with
each other. It can avoid interferences from irrelative modules
Power
It is used to set the output power of RF1276. There are 7 power
levels. The 7 means the max. output power---20dBm and 0 means the
lowest output power.
Serial baudrate It defines the data rate between RF1276 and the host
Serial parity It defines the parity check between RF1276 and the host
Table 2: Parameter Specification
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Figure 2: Indication of TX power level
Figure 3: Interface of RF Tool
Users can configure the parameters (frequency, data rate, output power, RF Factor, RF Bandwith etc.)
through PC or in circuit.
♦ Setting through PC. RF1276 port is UART/TTL. When RF1276 connecting with PC, users need to use
USB adapter. AppconWireless provides USB adapter as accessory. The schematic is shown in Figure 4
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Firstly users connect converter board to PC through DB9 cable and open ‘RF Tool’, then insert module
into converter board. After that, the status column of ‘RF tool’ will give a indication ‘Found Device’. Users
then can read/write the module.
If users connect USB converter, USB drive ’’PL-2303_Driver_Installer’’need be installed firstly. The
drive has different version for different OS. USB converter has five wires with five different colors: Black,
Red, Blue, Yellow. Black wire is GND pin. Red wire is VCC pin. Blue wire is TXD pin.
Figure 4: The connection diagram
♦ Setting in circuit . Users also can use microcontroller to change the default parameters. The work
mechanism is the same as in PC.
Sync word ID code Header Command Length Data CRC End code
0xAF 0xAF 0x00 0x00 0XAF XX YY LEN XXXX CS 0X0D 0X0A
RF1276 Command Structure
Notes: 1. The ID code is 0x00 0x00 in command.
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2. In command code, XX in sending command is 0x80 and in response command is 0x00. YY is the
command type. The work mode of
YY TYPE YY TYPE YY TYPE YY TYPE YY TYPE
0x01 write 0x02 read 0x03 standard 0x04 Central 0x05 Node
Command Type and Value
3. Length refers to the data bytes between Length byte and CRC byte which the two bytes are not
calculated in the length.
4. Data refers to the detailed parameters which need to be changed.
Baudrate Parity Frequency RF_Factor Mode RF_BW ID NetID Power
Parameter Sequence in Data Section
Parameters Length Values
Baudrate 1 byte 1=1200, 2=2400, 3=4800, 4=9600, 5=19200,6=38400, 7=57600
Parity 1 byte 0=no parity check, 1=odd parity, 2=even parity
Frequency 3 bytes The value=Frequency/61.035. E.g. For 433MHz, the value=
433000000/61.035
RF_Factor 1 byte 7=128, 8=256, 9=512, 10=1024, 11=2048, 12=4096
Mode 1 byte 0=standard, 1=low power, 2=sleep
RF_BW 1 byte 6=62.5k, 7=125k, 8=250k, 9=500k
ID 2 bytes 0x0000 ~ 0xFFFF, high byte first
NetID 1 byte 0x00~0xFF
RF_Power 1 byte 1=4dBm, 2=7dBm, 3=10dBm, 4=13dBm, 5=14dBm, 6=17dBm,
7=20dBm
Parameter Length & Value Range
5. CS refers to CRC code which is the remainder of the sum of data section divided by 256 In order to
understand the command, the section will demonstrate the use of commands by some examples.
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Write Command Code: 0x01
Command: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x80, 0x01, 0x0C, .... CS, 0x0D, 0x0A
Response.: 0xAF, 0xAF, 0x00, 0x00, 0xA F, 0x00, 0x01, 0x0C, .... CS, 0x0D, 0x0A
Read Command Code: 0x02
Command: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x80, 0x02, 0x02,0x00,0x00,0x91, 0x0D, 0x0A
Response.: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x00, 0x02, 0x02,0x00,0x00,0x91, 0x0D, 0x0A
Standard Mode Command Code: 0x03
Command: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x80, 0x03, 0x02, 0x00, 0x00, 0x92, 0x0D, 0x0A
Response.: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x00, 0x03, 0x02, 0x00, 0x00, 0x92, 0x0D, 0x0A
Saving Mode Command Code: 0x04
Command: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x80, 0x04, 0x02, 0x00, 0x00, 0x93, 0x0D, 0x0A
Response.: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x00, 0x04, 0x02, 0x00, 0x00, 0x93, 0x0D, 0x0A
Sleep Mode Command Code: 0x05
Command: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x80, 0x05, 0x02, 0x00, 0x00, 0x94, 0x0D, 0x0A
Response.: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x00, 0x05, 0x02, 0x00, 0x00, 0x94, 0x0D, 0x0A
Restart Module
Command 0XAF 0XAF 0X00 0X00 0XAF 0X80 0X20 0X02 00 00 CS 0X0D 0X0A
Reply 0XAF 0XAF 0X00 0X00 0XAF 0X00 0X20 0X02 00 00 CS 0X0D 0X0A
Note:The module is restarted after reset and the version number is printed.
Detect air signals
Command 0XAF 0XAF 0X00 0X00 0XAF 0X80 0X23 0X02 00 00 CS 0X0D 0X0A
Reply 0XAF 0XAF 0X00 0X00 0XAF 0X00 0X23 0X02 HH 00 CS 0X0D 0X0A
HH:0—There is data in the air 1—There is no data in the air.
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