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RF1276        LoRa module                      V3.0

 

                                                                  - 1 -                                                                                  2018-2-12 

 

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. 

 

 

 

 

 

 

Summary of Contents for RF1276 Series

Page 1: ...ility 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 r...

Page 2: ... 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...

Page 3: ... 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 insid...

Page 4: ...s 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 ...

Page 5: ...o 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 ...

Page 6: ...er 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...

Page 7: ...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 ...

Page 8: ...nstalled 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 L...

Page 9: ...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...

Page 10: ...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 ...

Page 11: ... 9 Application Schematic The connection schematic between RF1276 and MCU or terminal is shown as below The parameter of RF1276 serial port must match with MCU or terminal s RF1276 has the same serial port baud rate and parity style with MCU or terminal Two or more RF1276s in a system should have the same parameters such as TX RX frequency air date rate and RF channel Caution 1 When RF1276 is insta...

Page 12: ...can receive the data packets and compare the ID with itself If they are matched the module will deal with the data packets Otherwise it will discard them In order to avoid interfering each other only one module can be in transmitting state when the network is working RF1276 can set many different frequencies so that many networks can work in the same place and at the same time User should pay atte...

Page 13: ...that terminal transmit 100bytes to UART should NOT less than 347ms every time those mentioned problems can be avoided 3 Error control The wireless network module has strong capability of anti interference because of the high efficiency checking error correction with interleaving encoding technology However when it is in a bad circumstance that has strong electric interference the data may be lost ...

Page 14: ...setting of EN is wrong 7 The communication distance exceeds the range or the connection of antenna is bad Short communication distance 1 The supply voltage exceeds range 2 The ripple of power is too big 3 The connection of antenna is bad or it is a wrong kind of antenna 4 Antenna is too close to the surface of metal or the ground 5 Receiving circumstance is very bad for instance buildings and stro...

Page 15: ...er s instructions of the host device must contain the following statements in addition to operation instructions This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 This device must accept any interference received including interference that may cause undesired operation Changes or modificat...

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