Getpackettype; Lora® Modem Description; Lora® Modulation Principle; Table 8-2: Getpackettype Command - Semtech LR1110 User Manual

0x02: LoRa®

Other values are RFU

This command is the first one to be called before going to RX or TX and before defining modulation and packet parameters.
No protocol is defined by default.
This command will only work with the device in Standby RC, Standby Xosc or Fs mode, otherwise it will return CMD_FAIL
in the status of the next command.

8.1.2 GetPacketType

The command GetPacketType( ) returns the current protocol of the radio.

Table 8-2: GetPacketType Command

Byte
Data from Host
Data to Host

Table 8-3: GetPacketType Response

Byte
Data from Host
Data to Host
• PacketType corresponds to the modem used for the following RF transactions.
0:None

1: (G)FSK

2: LoRa®

Other values are RFU

8.2 LoRa® Modem Description
8.2.1 LoRa® Modulation Principle
The LoRa® modem uses a proprietary spread spectrum modulation, which permits an increase in link budget and increased
immunity to in-band interference compared to legacy modulation techniques. It has the capability to receive signals with
negative SNR that increases the sensitivity as well as link budget and range of the LoRa® receiver.
8.2.1.1 Spreading Factor (SF)
The spread spectrum LoRa® modulation is performed by representing each bit of payload information by multiple chips of
information. The rate at which the spread information is sent is referred to as the symbol rate (Rs). The ratio between the
LR1110
User Manual Rev.1.0
UM.LR1110.W.APP March 2020
0 1
0x02 0x02
Stat1 Stat2
0 1
0x00 0x00
Stat1 PacketType
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