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11	11	= How to use? =
12	12
13	13
	14	+
	15	+== 1. AT command： ==
	16	+
	17	+
	18	+**(% style="color:blue" %)1) Lora parameter configuration:**
	19	+
	20	+AT+FRE: Get or Set TX and RX frequency
	21	+
	22	+AT+BW: Get or Set TX and RX BandWidth
	23	+
	24	+AT+SF: Get or Set TX and RX Spreading Factor
	25	+
	26	+AT+POWER: Get or Set Tx Power Range
	27	+
	28	+AT+CRC: Get or Set TX and RX CRC Type
	29	+
	30	+AT+HEADER: Get or Set TX and RX Header Type
	31	+
	32	+AT+CR: Get or Set TX and RX Header Type
	33	+
	34	+AT+IQ: Get or Set TX and RX InvertIQ
	35	+
	36	+AT+PREAMBLE: Get or Set TX and RX Preamble Length
	37	+
	38	+AT+SYNCWORD: Get or Set sync word
	39	+
	40	+
	41	+**(% style="color:blue" %)2) General configuration:**
	42	+
	43	+ATZ: Trig a reset of the MCU
	44	+
	45	+AT+FDR: Reset Parameters to Factory Default
	46	+
	47	+AT+CFG: Print all configurations
	48	+
	49	+AT+FCU: Get or Set the Frame Counter Uplink
	50	+
	51	+AT+FCD: Get or Set the Frame Counter Downlink
	52	+
	53	+AT+GROUPMOD: Get or Set TX and RX group
	54	+
	55	+AT+RXMOD: Get or Set Rx Timeout and Reply mode
	56	+
	57	+AT+SEND: Send text data or hex along with the application port and confirm status
	58	+
	59	+AT+RECV: Print last receive message, RSSI and SNR
	60	+
	61	+
	62	+
	63	+== 2. Serial port information ==
	64	+
	65	+
	66	+**(% style="color:blue" %)1) Information initialized at reset：**
	67	+
	68	+[[image:image-20220926112125-1.png]]
	69	+
	70	+
	71	+**(% style="color:blue" %)2) In retransmission, the Uplinkcounter does not accumulate. The following figure shows that the third count packet is retransmitted twice when the ACK packet is not received.**
	72	+
	73	+
	74	+[[image:image-20220926112125-2.png]]
	75	+
	76	+
	77	+**(% style="color:blue" %)3) In the figure below, the receiver sends an ACK to the sender after receiving the packet, and the sender stops retransmission after receiving the ACK.**
	78	+
	79	+
	80	+**(% style="color:red" %)Receiver: (configured as AT+RXMOD=65535,2)**
	81	+
	82	+[[image:image-20220926112125-3.png]]
	83	+
	84	+
	85	+
	86	+**(% style="color:red" %)Sender:**
	87	+
	88	+[[image:image-20220926112125-4.png]]
	89	+
	90	+
	91	+
	92	+
	93	+== 3. Data Format: ==
	94	+
	95	+
	96	+1 byte of TXGROUPMOD +n payload + 4 bytes of checksum
	97	+
	98	+
	99	+Payload(S12, SF11, SF10 maximum length is 59, SF9 maximum length is 123, SF8, SF7 maximum length is 230):
	100	+
	101	+(% border="1" style="background-color:#ffffcc; color:green; width:316px" %)
	102	+|=(% style="width: 105px;" %)**Size (bytes)**|=(% style="width: 109px;" %)**1**|=(% style="width: 99px;" %)**payloadsize**
	103	+|(% style="width:105px" %)**Value**|(% style="width:109px" %)TXGroupmod|(% style="width:99px" %)Send data
	104	+
	105	+
	106	+
	107	+
	108	+
14	14	= AT Command Set. =
15	15
16	16	== Set TX and RX Bandwidth ==