RF1276 LoRa module V3.0 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.
RF1276 LoRa module V3.0 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.
RF1276 LoRa module V3.0 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.
RF1276 LoRa module V3.0 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.
RF1276 LoRa module V3.0 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.
RF1276 LoRa module V3.0 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.
RF1276 LoRa module V3.0 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.
RF1276 LoRa module V3.0 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.
RF1276 LoRa module V3.0 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.
RF1276 LoRa module V3.0 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.
RF1276 LoRa module V3.0 Please note that the working modes changed by the 0x03, 0x04 and 0x05 commands will not be written into nonvolatile memory so the working mode will be restored to the former mode before change after power-off. Users can use the WRITE command to change the working mode of module to standard mode or low power mode but the sleep mode will be restored to standard mode after next power-on even if the WRITE command is used. 9.
RF1276 LoRa module V3.0 Figure 7: Connection between Module and Device(TTL/RS232 port) Figure 8: Connection between Module and Device(RS485 port) 10. Constructing Network (one point to multi-point): RF1276 is a semi-duplex module, which can be communicated by point to point or one point to multi-point. In the second mode, user needs to set one master module, while the others are slave modules. Every module must only have one unique ID.
RF1276 LoRa module V3.0 on UART rate, air rate and the size of data package). In addition, it also need consume some time to transmit from module to terminal, but the delay time is permanent in the same condition. 2）Data flux control Although there is a buffer zone with 256 bytes in the wireless module, when the UART rate is higher than the air rate, there must be a problem about the data flux. It may cause to lose some data because the data overflow from the buffer.
RF1276 LoRa module V3.0 12. Q&A: Questions and Answers Can not 1．The communication protocol is different between two modules, for communicate instance: data rate and checkout. between two 2．The frequency or RF data rate is different between two communicated devices modules. 3．They are not the same kind products. 4．The connection between module and terminal is wrong. 5、The module is wrong. 6．The setting of EN is wrong.
Federal Communication Commission Statement • This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules see Ref. 4. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
